The uncovered VA8 section of beam pipe was surveyed in preparation for a visual inspection and some laser scanning.

Fields around the East and West elevated ledges of the beam pipe were around 100 uSv/hr. The pole monitor registered around 2mSv/hr on contact with the beam pipe indium joints.

------------------------

April 09:

We took recordings of the VA8 section using the remote pole camera () and took photos as well (attached).

The T1 cooling package was refilled to ~38cm and restarted. Shortly after restarting reservoir level dropped and settled to 37.8cm.

No visible leaks when viewed from the Meson Hall south walkway,level seems steady after ~1 hour of operation, water conductivity also returned to normal after a few minutes of flow.

All water PV green at EOD.

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UPDATE Feb 11:

At approximately 6.00pm yesterday, the water level in the expansion tank dropped to 36.4 cm, where it remained level overnight.

 All cooling system PVs stayed green overnight.

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UPDATE Feb 12:

Water level in the expansion tank remained level at 36.3 cm. Cooling package PVs all green.

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UPDATE Mar 27:

The T1-MK2 demin water flowrate was tuned to 1.1-1.2 gpm when in position 1 (12mm Be target). The profile monitor was actuated again in position 0 and confirmed to be working properly.

During this test, we found an odd 'stuck' state that the T1 system controls can enter where the control room operators became unable to turn off the cooling system. It turns out they don't have the ability to turn off single devices, like the pump, and can only turn off the whole system.

We likely arrived at this state by raising the ladder further, even though we were already at position 0 (manual jog button was used by the operator). As a result, flow was blocked and the water temperature ahead of the pump kept rising. This is actually quite a critical failure mode, in the future to prevent this problem, we should instruct control room operators to turn off the cooling system before driving the target ladder.

We solves this issue by asking Tony Tateyama to turn off the pump for us, likely his EPICS user account has the ability to turn off individual devices. With the cooling system turned off, we were able to complete the tests and tune the demin water flowrate.

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UPDATE Apr 3:

After the T2-MK2 target ladder was moved to the target station, the T2 cooling package was filled to 38.2cm and the cooling package was restarted after connecting services to the ladder. The water level in the expansion tank dropped to 32.8cm after restarting.

The level in the T1 cooling package dropped further to 34.9cm, which we assume is caused by trapped air that escaped the cooling system volume.

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UPDATE Apr 11:

T2 cooling package refilled to 38.3 cm, T1 cooling package refilled to 39.7cm.

The compressed air ASCO valves for the M9BB, M20BB, T1 Profile Monitor (2x 8342C1 [rebuild kit 306-191] + 1x 8320G216 [rebuild kit 314-949] respectively), and T2 Profile Monitor (8320G216) were serviced with their rebuild kits.

To service these valves, we isolated them from the compressed air source by shutting off the outlet valves on the air amplifiers and venting the compressed air through the shared inlet lines (see photo).

When reinstalling the T2 profile monitor valve, there was some difficulty turning one of the Swagelok nuts. It would be a good idea to prepare spare tube fittings to replace any that no longer seal properly.

We can re-energize the air amplifier and check for leaks in the valve in the coming days (tube of soap solution brought to red toolbox on blocks)

The actuation of the T1 profile monitor and T2 beam blockers (M9 & M20) can be checked shortly after the air amplifiers are re-energized.

When the T2 target is returned to the station, we can check the actuation of the T2 profile monitor.

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UPDATE Feb 19:

The air amplifiers were re-started, supply valves to the T1 and T2 valves were re-opened, and the T1 profile monitor solenoid valve was tested by actuating the profile monitor.

The T1 profile monitor moved 'in' and 'out' successfully without timing out, but the control room operator noted that there was some odd status on EPICS for the T1 'harp' and that it did not correspond to the limit switch status for the profile monitors.

At T2, the M20 blocker solenoid valve does not hold pressure when supplied with air (toggle on cooling package panel turned on) and vented through the open port.

• Troubleshooting results:
  • M20 solenoid, when connected to the M9/T2 blocker solenoid electrical connector, 'opens' successfully and does not leak, causing the M20 blocker to go up.
  • M9 solenoid does not 'vent' when disconnected from the connector, successfully holds pressure in the 'rest' state.

We believe we made a mistake when re-assembling the M20 solenoid valve, this will have to be troubleshooted at a later date and possibly review the 'harp position' status on EPICS for the T1 profile monitor.

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UPDATE Feb 24:

The cause of the 'leaky' M20 valve was identified: it was installed in the reverse orientation, small arrows were drawn on the M9 and M20 valve bodies to denote the direction of airflow to prevent future installation issues.

The air amplifier was venting through the muffler, which is not the way that it normally operated prior to being turned off. We will look at this issue at the end of shutdown when testing the beam blocker actuation.

DRAWINGS UPLOADED IN PDF, DOWNLOAD TO VIEW ALL DRAWINGS, PREVI

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Jan 27:

T1-MK1 was moved to the storage pit in position #4. M9BB was moved to the hot cell for shutdown maintenance (o-ring replacement, air cylinder servicing, etc.).

When M9BB work is done, it will be returned to the target station and replaced with T2-MK1 for servicing (target exchange, measurement target installation, etc.).

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Jan 29:

Maintenance operations on the M9BB were completed on the hot cell.

• The air cylinders actuated and lowered smoothly, and at 42 psi as indicated in the instructions document.
• The felt wiper on the shaft seal was replaced.
• 3 o-rings were replaced on the bronze shaft seal bracket and lubricated with vacuum grease
• upper limit switch actuation was confirmed after reassembly
• BB returned to the adapter plate on the turntable and reoriented for pickup

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Feb 03:

M9BB returned to target station:

• o-ring groove on monolith cleaned,
• replacement o-ring with vacuum grease placed
• during return, we noticed pieces of 'scrap metal' on the bottom of the beamblocker, it was removed and when scanned registered a count that exceeded the radiation cave monitor's dial, this will be stored/disposed as active waste.
• M9 ASU still disconnected, could not 'push-down' M9BB with gas line connected, gas line left disconnected for now.
• T handle plate removed, limit switch rod returned

T2-MK1 moved from target station to hot cell roof, north hook used for flask, south hook used to adjust the position of the alignment frame:

• section of hot cell roof railing had to be removed for the flask to clear when handled by the north hook, there is also a similar functioning cutout on the wall by the storage pits
• peak fields are 1100 uSv/hr at the hot cell opening by the target.

T2-MK1 servicing started on hot cell roof:

• T2-MK1 water flush completed, ~1 min air purge cycles completed for all target positions, left at position 5 (plugged) for longer term air purging (~3 hours).
• A broken ceramic cap was found on the top of the target vacuum flange.
• 4 quarter circle segments from what looks like the old-style graphite targets were found on the base of the target ladder.
• The coupling between the potentiometer gearbox and the ladder drive screw has a rubber section, we will have to inspect it and decide whether to replace it with a metal coupling during this shutdown, if so, we should also replace the plastic ferrules and update the bulkhead plate to be more servicable.

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Feb 05:

T2 station was surveyed, peak fields were found by the blanked off T2 opening: 4mSv/hr. Immediately at the cover fields were around 16 mSv/hr.

No fallen pieces of suspected graphite target segments were found on the monolith, it may be a good idea to check inside the monolith hole with a remote viewing camera to make sure nothing is obstructing the locating feature on the base of the target ladder (to be included in the T2 return work permit).

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Feb 10:

The T2-MK1 target ladder underwent a water rinse and several days of air purging. 

5 psi compressed air was run through each target position (including position 5 which is plugged) for several hours each. Then, the ladder was fully dried using the leak detector and  cold trap on Feb 07.

The leak detector was calibrated with Vacuum Group's external source to 8.7e-8 mbar-L/s prior to operation. The leak detector and vacuum line up to the target service panel connections were checked to be leak tight prior to testing (0 leak rate and <1e-3 Torr pressure).

A single pump-down cycle was sufficient to get vacuum to establish within reasonable time:

• Total pump-down duration was ~55 minutes
• 60 seconds to go into 'fine vacuum' mode.
• 2 min 13 seconds to get to ~1e-3 Torr vacuum in ladder
• leak rate was initially ~1e-8 Torr-L/s and slowly dropped to 0.0e-10 Torr-L/s over the course of the pumpdown (48 minutes to bottom out)
• the ladder was left at the bottomed out leak rate for around 5 minutes prior to venting. 
• approximately a 1cm thick, 10cm diameger puck of ice formed on the side of the LN2 vessel of the cold trap.

Upon closer inspection with Isaac Earle, the following were observed for graphite pieces on the T2-MK1 target ladder base:

• The surface finish on the chips strongly suggest that they are graphite target materials
• Curiously the graphite chips are all of different thicknesses, to our understanding, the graphite material used in the old targets are of consistent thickness.
• The rounded faces of the chips had no clear sign/evidence of brazing when compared to sample pieces that can be found in the Hot Cell Lab office.
• No clear signs of beam spots can be found on the flat faces of the chips, near the corner edge.
• No clear signs of brazing on the targets were observed.

The above observations suggest that the chips did not originate from an operational target that has seen beam.

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Mar 21:

The T2-MK1 target ladder was leak tested with 3psi x 0.5s doses of He.

The baseline initial leak rate of the ladder was ~1e-8 Torr-L/s but reached around 1e-10 Torr-L/s when allowed to pump down over ~1 hour. Fine test was reached after 30s of pumping down (with cold trap), ladder pressure was stable at ~1e-3 Torr throughout.

See attached image for detected leak rates, overall all joints performed well, with the highest leak rate of 4.2e-9 Torr-L/s registered by one of the joints on ladder position 1.

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April 02:

The T2-MK2 target ladder was moved to the target station from storage pit #3.

During the return procedure, from visual inspection of the target tube, there doesn't seem to be any dropped material in base of the tube.

We encountered some difficulty seating the o-ring on the monolith flange's groove because the o-ring was stored in a coil. Extra vacuum grease was used to keep the o-ring stuck flush in the groove.

When lowering the ladder onto the monolith flange, the chain hoist bottomed out just short and we had to lower the flask with the crane for the target ladder to make contact. Edi from vacuum group helped us pump down on the vacuum volume and at first glance it seems to be pumping down ok.

We will return in the coming days to re-do the service connections to the target ladder and do a final check of the system.

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April 03:

The plug in pos#5 and the 5cm target (SER# 301) in pos#3 on the T2-MK1 target ladder were removed in the hot cell and bagged and moved to the East hot cell. 

The loose graphite material on the base of T2-MK1 was also bagged and labelled and moved to the East cell. 

The measurement target bracket TRH1766 was installed in position 5 and a 5cm target cassette (SER # 308) was installed in position 3.

The target bracket was cleaned in an ultrasonic cleaner with simple green, then tap water before being dried. The tube screws were switched with DIY vented screws.

The pos 3 and 5 male Swagelok threads and conical sealing face were 'cleaned' with the conical scotch-brite tools (cone and cup) with the air ratchet and blown out with a compressed air can.

The Swagelok nuts on the new target cassette and bracket was first tightened till the Swagelok gap inspection gauge could not fit in the gap.

The ladder was then leak checked and initially only pumped down to 3e-3 Torr with 2.5e-8 T-L/s leak rate. After some tightening of the Swagelok nuts on pos 3 and pos 5, the pressure and baseline leak rate eventually bottomed out to 1e-3 Torr and 0.0e-10 T-L/s respectively.

With 3psi x 0.5s He, the highest leak rates were found in position 2b, 3b, and 5a, all being less than 3e-9 Torr-L/s.

Of note, there is a 'ding' on the 'right' side bellows (as viewed from hot cell widow with target ladder rotated closer toward the window), the highest leak rate was found when we sprayed He directly at this 'ding'.

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April 03 (Continued):

We moved the T2 flask alignment frame off from the T2 station, re-connected all target services to T2-MK2 and re-connected the compressed air line to the T2/M9 blocker.

The T2-MK2 profile monitor drives in/out properly without timing out.

The target ladder drives up and down smoothly between pos 0-3.

We tuned the demin flowrate to 1.1-1.2 gpm for the T2 target in position 3 (5cm Be), and for the T1 target in position 1 (12mm Be, actually done end of Mar).

After some time allowing the pump to flow, all process variables in the cooling package reached operational ('green') levels.

As normal though, the T2 target flowrate was relatively low and close to the lower warn limit of 3gpm. We should look into upgrading the pump on this cooling package or adjust the warn/trip limits according to some Engineering analysis.

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April 09:

• We attempted to open the needle valve on the T1 heat exchange further but it was already fully open. Flow through the heat exchange is still fluctuating around 6.3 GPM, occasionally dipping below 6 GPM. It may be possible that the heat exchange paddle wheel needs to be changed for the flow rate to increase again.

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April 11:

• After re-inspecing the supply and return lines for the T1 heat exchanger in the BL1A tunnels, no metering/flow adjusting valve was found (also true for the T2 line). The flow through the T1 heat exchange will have to hover around the 6gpm mark (flow changed likely because other upstream systems are receiving flow).
• The flow through the T2 target (12mm Be) hovers around 3GPM, for both position 3 and 5 so we will have to deal with it hovering around the warn limit for the coming operational period (pending thermal analysis to justify changes to the warn limit)
• The M9/T2 and M20 blocker movement was tested and confirmed.
• The profile monitor movement for both the T1 and T2 target ladders were confirmed.
• We also tested a method of powering off the cooling pump by disconnecting the PLC signal/control cable to the 480V power box on the mezzanine.After disconnecting the signal cable, the T2 pump successfully turns off and upon reconnecting, the control room successfully regains control over the pump.

All rubber components on the T1 T2 water solenoid valves were exchanged on Jan 22, 2025.

To service the heat exchange water and all collimator solenoid valves, the low active copper supply line in the 1A tunnel had to be shut off (see pictures). Note that the shut off for the T2 secondary water did not work perfectly, it is possible that there either the valve was not shut off properly or there is another shutoff valve in the 1A tunnel that needed to be turned (see picture of 'T' on T2 supply). When exchanging the rubber seal and o-rings on the T2 parker heat exchanger solenoid, approximately 1-2L of active water flowed out from the valve opening onto the blocks. When returning into the 1A tunnel at the end of the valve servicing job, no dripping water or pools of water was found.

The solenoid bodies and connectors were not exchanged, but we will check that they are working properly after re-filling the systems near the end of shutdown.

All CUNO filters at T1 was exchanged on Jan 17.

At the time, access to the CUNO filters at T2 was obstructed by a shielding block, we will exchange these filters once the block is moved.

All Hansen fittings on the target station were inspected, all o-rings found to be in good condition.

No leaks identified in system.

The noisy T2FGSEC proteus paddle wheel flow sensor electronics was replaced.

While exchanging the sensor board, we decided to compared the wear on the paddle wheels of this sensor and another sensor (Q1, << sees less flow rate than T2FGSEC).

We found that both paddle wheels had similar levels of wear and decided to exchange both while we had the sensors taken apart.

UPDATE JAN 24:

The two CUNO filters on the T2 cooling package was serviced, all 5 spent filters transfered to MH RH HC lab for temporary storage, kept in boot box area by the hot cell tool port (attached photo only shows 4, 5th spent filter underneath rest).

It was noticed that the -235 O-ring beside T2 pump was no longer circular, new maintenance item added to checklist for all CUNO O-rings to be replaced, will be done in coming shutdown.

The T1 and T2 cooling packages were drained starting at 14:36, by 14:48 both expansion tanks had dried, meaning the draining rate for both tanks were ~80L/hr, generally it will only take 2 hours to fully drain the system.

Tritium samples were collected after allowing the system to drain for ~5 minutes to clear out water in the drain lines and actually collect samples from the reservoirs. The samples were passed onto RPG for analysis.

The drain valves on the cooling packages and in the BL1A tunnel is left open.

Update Jan 23: the drain valves in the 1A tunnel and the valves on the cooling packages were closed.

The following maintenance tasks were completed on 2024-11-29 by A. Newsome, A. Kong, A. Tam, M. Dalla Valle:

• Warm cell right window water level topup... the water level was a couple inches lower from the top. Using a tube connected to the nearby sink, the level was topped up fully. See attached before/after picture.
• Hot cell oil level checks:
  • Right side OK. See attached picture.
  • Left side very low compared to July 2022 measurement (suspect internal leak?). The oil was topped up. See attached before/after picture.
• Hot cell scissor table pump oil level check - M. Dalla Valle notes this was topped up approximately July 2022. The table was operated and functioned normally, did not sound concerning. The oil level was visible and acceptable.

Still to do, next maintenance check-up:

• Check HC atmospheric pressure differential gauge
• Lubricate HC turntable (planned for 2025 winter shutdown when target assembly not present)
• Lubricate all telemanipulators

T1-MK1 electrical checks were completed on the hot cell. Specifically the profile and protect monitors were checked (assistance from Micheal Donohoe and Holden Jones from 'probes group'/accelerator systems).

Reference WP C2024-10-30-3.

"WORK INSTRUCTIONS / REFERENCE DOCUMENTS: Perform blip test of target protect module by attaching HV oscillator to protect HV bias. Check that the oscillator signal is readable from U,D, L, R and HALO signal cables.

For profile monitor, connect PM cable assembly to 0518 MWC module in portable NIM crate. Connect 0518 "START" to ch2 of an oscilloscope and "ANALOG" to ch1. Set scope to trigger on Ch2. Connect HV oscillator to profile HV bias. Observe signals on all channel devisions, note any channels not responding."

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Test outcome (paraphrased from text discussion with Micheal Donohoe)

Profile monitor functioning properly from test, but right 'plate' on protect monitor yielded different results to other plates. May need to be re-checked, pending comparisons with results from previous tests (issues with this because "different oscillator was used"). We may have also not used couplings for cables that were correct for that particular protect monitor plate.

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In images attached, red cable used for profile monitor (connect to the vertical connector at the rear), the dark green wire is used to ground the system when the profile monitor is being checked. The grey cable bundle (with 'box') is used to check the protect monitor, with vertical pins located by the main lifting flange support bars in the front left of the target (see bottom right of first image).

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Micheal and Holden returned on the 31st with Thomas Manson, they performed direct testing on the leads of the protect monitor connector (directly hook up leads on protect monitor connector to oscilloscope/multi-meter). All direct checks went well, the waveform issue from yesterday's testing likely resulted from the testing cable having issues.

Electrical testing on T1-MK1 is now complete. Probes group will work to update their documentation and possibly develop a process change to fabricate new cables to make the testing happen fully on the hot cell roof and have it complete faster.

Note: it may be a good idea to perform preventative maintenance on the protect monitor @ T1-MK1 the next time it is on the hot cell. Probes group members noted that the protect monitor components are nearing their end-of-life and it would be good to replace old components to avoid the protect monitor failing in the target station.

A safety walkaround was completed for the Meson Hall Hot/Warm Cells.

The resulting spreadsheet can be found on DocuShare as Document-242733.

Main deficiencies identified:

• Hot Cells:
  • Pressure gauge reading is suspect
  • Operator station phone not working (resolved now)
• General:
  • Lifting equipment has overdue inspection

Action has been taken on all deficiencies.

The active sump high level sensor was tested and correctly alarmed locally. However the alarm in the MHESA RCR lab did not make any sound and no notification was recieved at the main control room. After some investigation, it is believed that the RCR lab alarm 'had already produced a notification at the control room and so no new notification was produced by testing the remote handling sump. Alternatively, the RCR sump alarm may have been silenced in the control room and so the notification was not seen. 

We will look to modify the system so that our sump's alarm does not piggy-back off the RCR sump alarm when notifying the control room.

Secondary flow sensor B1A:T2CS:FGSEC:RDFLOW on the T2 cooling station suddenly became very noisy at around 11 pm, 01 September 2024.

The sensor reading would fluctuate from 0-150 gpm which is beyond typical noise levels for these sensors (~2gpm).

The noise spontaneously ended at around 4 am, 05 September 2024.

The noise likely originated from some stuck debris preventing the paddle wheel from turning normally that got spontaneously dislodged.

Alternatively, changes in the environment temperature could have broken some electrical contact that recovered when the temperature cooled over the weekend. We will make a note to look into this sensor in the coming shutdown and perform preventative replacement of components.

(UPDATE: see ELOG 359, FGSEC serviced)

During a replacement of the RCR1 active sump (mechanical services group), approximately 600L of non-active grey water was released into the RH active sump. At this time, this should be all of the water in the RH sump (approximately 600L total).

The RH active sump was drained (over Jul 31-Aug 01), in total approximately 5500 L of water was sent to city sewage.

We also tried to divert water from the BL1A holding tank to the active sump, and learned that we cannot run back-flow through the sump pump. The valving configuration used here was V10, V1, SV1, V6 open - V2, V3 closed. (Note solenoid valve SV1 does not serve a purpose and energizing/powering-down does not affect the observed flow.)

In order to divert water from the holding tank to the sump, we likely need to add a 'T' after V6 to send the flow through the opening port into the sump.

The BL1A holding tank was subsequently drained and is now ready again to receive water from T1/T2/TNF.

A safety walkaround for July 2024 was completed by A. Kong.

Results can be found in the master spreadsheet

Major deficiencies:

• Identified a 1/2 ton chain hoist missing an inspection tag. Mechanical Services will need to be informed about this.

The primary transfer flask was inspected on the 26th of June, 2024:

1. Electrical cabling and connections externally mounted on the flask + on the hook/latch were inspected for wear, damage, proper connections,etc.
   • It was learned that the controls+power cable that drives the latch also runs the height indicator pulley+lead weight system, this should be reworked in the future and replaced with proper load bearing rope/cable.
   • The cable connecting to the main control box was duct-taped heavily, it may be a good idea to replace it with proper reinforcement in the future.
   • The power cable connection to the grey junction box is not terminated properly and should be re-terminated (some other cables may need to be re-terminated properly).
2. Various markings on the exterior of the flask were checked:
   • Marks on the flask flange were still visible
   • Marks on the flask body for reference flask orientation were still visible
   • The weight of the flask (30,000 lbs) had faded and was written over with a sharpie (it may still be a good idea to paint a larger version of the weight so that it is visible by the crane operator)
3. Limit switches throughout the flask was inspected
   • The chain hoist limit switches were tested and both functioned properly, some wear was observed on the spring toggle for the upper limit switch but it does not need to be replaced yet.
   • The limit switches on the hook/latch were tested and functioned properly, with the exception of the 'unlatch' limit switch which we could not test because the unlatch indicator light on the control was broken (this should be re-tested in the future).
4. Rolling/rotating components (pulleys for the door and level indicator, guide wheels inside the flask,  door pin/hinge, main lifting eye, hook latch) were inspected
   • A retaining ring was missing from one of the level indicator pulleys which was promptly replaced
   • All other pins/shafts/rollers were in visually in good condition and rolled properly (despite some being rusty) and had proper retaining components (cotter pins, retaining rings, etc.).
   • Note that for future inspections, it may be a good idea to manually move the various rollers to check by hand if the pins/shafts need to be lubricated
   • Also, the lead weight driving the level indicator should be painted over, and a sacrificial contact pad should be used to prevent the load from wearing the outside of the flask
5. Electrical assemblies inside the control and grey junction boxes were inspected and found to be in good condition
   • *Except for a broken LED for the unlatch limit switch in the main control box (the broken LED issue was sourced to a broken relay that was promptly replaced, the unlatch status light shows up now)
   • All hook/latch actuating switches on the control box seemed to be working (note that the finger-related switches were not tested)
   • Note that there is an 'override' button on the control box whose purpose is unclear, we should investigate this to determine its purpose in the future
   • Note that to access the internals of the control box, only the two central screws along the white line need to be removed
6. The chain hoist and cable pulley system for flask door were inspected
   • The chain lubrication seemed dry, it would be a good idea to re-lubricate the chain properly and perform some form of maintenance on the hoist in the future
   • The chain length is retracted and dropped from a bucket and currently causes the chain to rub against a corner on top of the flask, in the future it may be a good idea to make some changes to avoid this
   • The flask door cables used duct tape to prevent the crimped cable loops from fraying and was still in good condition
   • In the future, we may want to look into the cables' channel to check for fraying or damage along their length.
7. Inspect main flask structure
   • Welds on and around the main lifting eye were in good condition without chipping paint
   • There was visible deformation on the lifting eye from contact with the hook, but this should be no cause for concern, and besides this, no signs of wear/damage was found on the lifting structure
   • The external welds on the main flask body were in good condition
   • The welds on the hook/latch that we could see were in good condition and still fully painted
   • There was some rusting on the platform
   • The welds on the ladder and platform were of lesser quality than the lifting structure but no cracks or broken welds were found
   • In the future, we should determine a weight limit for the platform based on some analysis
8. The aluminum tray was inspected and found to be in good condition, however we should replace the old rubber pieces with new ones at some point
9. The drive mechanism for the doors/hook/latch was tested and we were able to travel the full distance without abnormal sounds from the chain hoist.
10. Seismic clamps were inspected and the bolts + threaded inserts were re-tapped and greased for smoother disassembly/installation.

In addition to the items above, the four 'fingers'/actuators that are holstered by the base of the flask was inspected visually, we will confirm their function before determining whether they need regular inspection/maintenance.

Also, at some point we should inspect the target alignment frames, their camera systems, as well as hot cell flask controls systems.

On May 23, 2024 two sets of plugs from position 1 and 3 and a 12mm Be target from position 5 (serial #109) was removed from T1-MK1 in the Meson Hall remote handling hot cell.

The plugs and spent target are kept in the secondary hot cell (East) on the lift table for future beamspot imaging and to cool down prior to disposal.

In their place 12mm Be targets were placed:

• #107 in position 5
• #110 in position 3
• #111 in position 1

We will continue with leak checking and position measurements in the coming week, at which point this ELOG will be updated.

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UPDATE May 24:

• leak testing began on the T1-MK1, vacuum stagnated at 1.5e-2 Torr and a leak rate of 3.9e-07 atm-cc/sec (system vented, will re-tighten target fittings and re-do leak test). 
• after tightening and repeating pump-down in the afternoon, the vacuum volume stalled again at 1.5e-2 Torr. releasing helium to the target fittings registered a response in the leak tester at all virtually locations (for either side of the ladder). 
• the plan for the coming monday is to re-check the vacuum fittings and re-tighten the swage-lok connections to the targets before repeating the leak test once more.

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UPDATE May 27:

• the swage fittings for the targets on position 1,3,5 were tightened in the morning but the volume still couldn't be pumped down to 1e-03 Torr.
• pumping down only on the vacuum line (up to KF elbow ahead of hansen fitting at outlet of target connections pannel) allowed the pressure to drop to 1e-03 Torr so it was determined that the leak tester + associated vacuum connections were not the problem.
• shortly afterwards, we troubleshooted by pumping only to the 'high pressure test' setting (no Turbo pump) and sprayed helium to various joints above the target flange. we learned that there is likely some leaking through the hansen fittings + the swage elbow from the fittings down through the target flange.
• plastic ferrules are used in this elbow to allow for some seals to be replaced, so this may be the source of the leak.
• then, the fittings on the target ladder were re-tightened and helium was sprayed onto various fittings on the ladder. all but the left join on target ladder #1 (position 9a) does not register a leak rate above baseline after tightening.
• at end of day, the ladder was able to consistently reach a base-line leak rate of 1.7e-07 Torr-l/sec and a vacuum of 4e-3 Torr.
• we will proceed with replacing the water line connections on top of the target flange and re-check the leak-tightness of the ladder in the coming days.

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UPDATE June 14:

several attempts at replacing the plastic (Nylon, Swage NY-1013-1 and NY-1014-1) ferrules and re-establishing the fittings on the target service panel were made since the last update. it was determined that the lines leading from the leak detector to the target panel was leak tight (reached 1e-03 Torr within ~5 minutes of pumping down). a double-male Hansen adapter was made to test this (see image). in the final attempt to re-seal, the nylon ferrul-ed fittings were tightened last and the target managed to pump down to 2e-03 Torr, with a stable baseline leak rate of ~2e-08 Torr-L/s. note that prior to exchanging targets, the leak rate obtained during water flushing was 1e-10 Torr-L/sec. additionally, spraying helium on the inlet fittings still registered a response at the leak detector (~4e-6 Torr-L/sec in the worst case).

we think that the following happened to the target, leading to the leak: at some point the target panel collided with something by the water outlet hansen port (see image), this caused the nylon ferrule at that line to crack/become damaged but no leaks occurred immediately after. when we performed the target exchange, the water line was disturbed in some way either as a result of torque-ing the target fittings or when the ladder was moved on the turntable causing the joint to completely fail and leak. because of the damage from the collision, after taking the fittings apart, it is no longer possible to return the fittings and for them to seal.

the plan moving forward is to implement some minor design changes to 1) replace the damaged fittings on the target panel, 2) better facilitate replacement of the nylon ferrules in the future, 3) better facilitate leak testing on the target service panel connections.

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UPDATE Sep 27:

• After designing, releasing, and procuring the leak fix components (see TRH1681), we implemented changes to the electrical barrel connectors and tested the fit of the cooling line piping (see pictures).
• We checked that the ladder motor, potentiometer, and limit switch circuits all worked properly.
• Some differences were noted:
  • D10414-2 accepts 1/4"-20 screws to mount the panel, not 10-24 like shown in the legacy drawings, the clearance hole on TRH1682 had to be adjusted accordingly.
  • The low profile screws specified for the barrel connectors were difficult to use (item 108 in TRH1681), so instead we used normal 4-40 socket head cap screws and were able to check that the barrel connectors could fully couple without interference from the socket head.
  • We did not use lock washers for the barrel connector flanges because they drop too easily and instead we elected to tighten the nuts well.
  • Some loose leads fell out of the potentiometer (bottom left) and profile monitor (bottom right) barrel connectors. These were not electrically connected to anything so we decided to remove them, they will be kept in a recorded location at the end of the operation. 
• In the coming week, we will look to fasten the water line fully and check that they are leak tight.

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UPDATE Oct 02:

• The water line was fastened fully, some items noted:
  • Order of fittings tightened: elbow to bulkhead adapter > elbow to reducer > 5/8" connector to tube > elbow with reducer to tube > nylon ferrule connection
  • We tried to tighten the elbow with reducer to the tubes with the tubes in position to minimize loading the nylon ferrule at the end but found that the outlet tube still ended up protruding significantly from the bulkhead plate (see image). For future operations we should make a note to not load the outlet tube too significantly because it is only supported by the tube (bulkhead nut not fully engaged).
  • The above issue likely resulted from bending the tubes to the 3D printed template but yielding misaligned ends. In the future better templates that emphasize absolute end alignment for tube bending should be made
  • The NPT-Hansen nipple was not tightened before the water line was put on which may have applied unnecessary loads onto the tubes. In the future we will make a note in the drawing on which fittings to tighten first and how to perform the operation to minimize loading on the nylon ferrules
  • In the future some modifications can be made to help relieve this issue for version 2 of the water connections, maybe using flexible metal tubes or thinner walled pipe, alternatively we can implement a more flexible mounting approach for the Hansen ends.
• We noted some tight clearances on the electrical bulkhead. In future implementations of the fix, the connectors can be spaced farther apart or staggered, also they should be moved further down from the top flange of the target ladder.
• Leak testing proceeded with the following results:
  • Total time under vacuum ~2 hours
  • Reached 'fine' vacuum within 1 minute, pressure saturated to 2e-3 Torr within 3 mins 30 secs.
  • Baseline leak rate of 0.0e-10 Torr-L/s reached within 7 minutes of pumping down.
  • ~1.4e-9 Torr-L/s peak @ 15s delay (to first signal) after 1s x 3psi He to general vicinity of newly made water line connections << deemed acceptable
  • 0.5s x 3 psi bursts of He
    • ~0.9e-09 Torr-L/s peak @ 15s delay to nylon ferrule outlet line (did not change after further tightening) < deemed acceptable
    • ~0.2e-10 Torr-L/s peak @ 15s delay to nylon ferrule inlet line < deemed acceptable
    • ~0.5e-10 Torr-L/s peak @ 40s delay to NPT-Hansen outlet < deemed acceptable
    • ~0.4e-10 Torr-L/s peak @ 40s delay to NPT-Hansen inlet < deemed acceptable
  • SS swagelok connections not tested thoroughly due to low likelihood of being a leak source (all tightened properly to 1.25 turns as per swagelok directions)
  • He 'bleed' test by closing hot-cell He wand solenoid valve and bringing wand opening ~5 cm from pos.5 target swagelok resulted in a stable leak rate of 0.8e-8 Torr-L/s << target ladder leak likely prevents pressure in target ladder from bottoming out.
• Will carry on with leak testing the target ladder and possibly the swagelok fittings on top of the hot cell if necessary by the end of the week.

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UPDATE Oct 04:

• The target ladder was pumped down at ~11 am and reached the same baseline as yesterday (0e-10 Torr-L/s @ 2e-3 Torr within 3mins, 30 sec), but in the afternoon, the baseline leak rate worsened to 1.0e-8 Torr-L/s.
• For reference, 0.5s of 3psi He was delivered to the water outlet nylon ferrule joint and registered a response of 1.8e-8 Torr-L/s with a delay of 20 sec. A 3s spray at 3 psi around the water fittings registered a 4.9e-8 Torr-L/s response with a 15s delay.
• The following was observed from sending 0.5s of He to the target ladder Swagelok fittings (see Img for more details):
  • Leak rate baseline improved during testing (~over 1 hour) to 3.0e-9 Torr-L/s
  • Bellows, and targets 2-5 registered leak rates in the order of 1e-8 Torr-L/s
  • Target 1's left Swagelok fitting registered the highest leak rate at 2.8e-7 Torr-L/s (when the leak rate baseline would have dropped to the lowest value of 3.0e-9 Torr-L/s)
• We checked the KF and hansen fittings to make sure that they are not a leak source and managed to bottom out on both the leak rate and pressure readings on the leak tester.
• We will take off Target 1 in the next session, run a die over the male threads, clean the conical face of the male thread with scotchbrite,and attempt to re-do the target joint before leak testing once more.

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UPDATE Oct 11:

• We removed target at pos 1 (ID 111), noticing that the swagelok nuts were easy to undo.
• Working theories on how they became 'loose' include: 1) creep undoing misalignment between the two swagelok tubes on target, 2) vibration from the nuclear ventilation onto the target ladder undoing the joint, 3) thermal changes between summer and 'fall'.
• The threads on pos1 seem worn, it may be a good idea to plug this ladder position permanently to avoid further damaging the threads and jeopardizing the ladder in the future (see image).
• The ferrules on the target seem to be in good condition but we should still clean them with the scotch brite tool
• We added plugs over the exposed male swagelok ports to protect from debris entering the water line.
• We placed the removed target between two wypalls and weighed the wypall down with a wrench to protect it from debris.
• The 3D printed scotch brite tools need to be re-designed for 3/8" drive size (was designed for 1/2" drives).
• We will return to bag, and package the target for safe keeping in the secondary hot cell; clean the male swagelok threads and sealing faces on pos 1 target ladder; and possibly place permanent plugs in pos 1.

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UPDATE Oct 15:

• The leak tester was calibrated with an external calibrator. Original leak rate 1.3e-7 Torr-L/s, 2% loss over ~10 years >> ~1.1 Torr-L/s leak rate.
• The leak checker registered an initial leak rate of ~2.3 Torr-L/s before calibration so we corrected the measurement (at least within the calibration range) by a factor of 2.
• This voids old leak testing data that we made on the target ladder.
• We will add a note to the procedure to ensure that the leak detector has been calibrated before performing leak testing in the future

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UPDATE Oct 23:

• After some testing with 3/8" tube Swagelok threads outside of the hot cell, we determined that the reason the threads in pos 1 of the target ladder was 'difficult' to run was likely because the nuts were over-tightened previously.
• There is a risk of compromising the threads if we run the die over over-tightened threads because they have been shifted from where they should be. We will instead attempt to replace the plugs, after cleaning the sealing face on the male threads using the cleaning tools.
• We also checked with a Swagelok tightening gage (3/8) to see whether the other targets were tightened properly, and all had gaps smaller than the gage. Note that we could not get fully into the gap with the gage on the side by the profile/protect monitor due to interference with a support column with the gripper. We will make an extender tool to avoid this issue in the future.
• We also bagged the target that was previously mounted onto pos 1 on the ladder and moved it to the secondary hot cell for storage (temporary).

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UPDATE Oct 24:

• The threads and sealing face on pos 1 were cleaned with scotch brite, blown with compressed air from the inside by connecting compressed air line at the service panel, blown with compressed air from a bottle externally, and wiped with a wypall with the manipulators.
• The old plugs were moved to the secondary hot cell, new plugs were tightened onto pos 1.
• Initially the baseline leak rate was 3.3e-8 Torr-l/s at 4e-3 Torr. With He, we were able to determine that the plugs, specifically position 9a, was the most leaky joint in the ladder.
• After a couple rounds of tightening the plugs, and making sure that the remaining targets were also tight, the baseline improved to 1.7e-9 Torr-l/sec. The plug at position 9a also no longer registered a leak response from having the He line brought up to the joint.
• The plug at position 9a still is the leakiest location in the ladder however, registering a peak leak rate of 2e-8 Torr-l/s at the final baseline.
• We deem that the ladder is sufficiently leak tight, and we will move on to replacing a rubber coupling on top of the target ladder before performing target position measurements.

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UPDATE Nov 25:

• The coupler was successfully removed with a custom puller tool (see TRH1730, TRH1731, TRH1732, and Document-244878). This tool is used for the 3/8" shaft side.
• The press fit coupler had to be cut up with a dremel and saw before using the tool.
• The old coupler had to be 'cut-up' to be removed. During initial troubleshooting, the rubber body split, indicating that it was near end of life.
• The replacement coupler system could be inserted without removing any parts.
• The relative alignment of the shafts may have changed up to 1/2 a turn during this process (the printed clamps were not strong enough to resist torques exerted when attempting to remove the press fit coupler).
• Potentiometer table will need to be reviewed when performing target measurements.
• Light loctite to be added to the treads.
• Note: the old coupler has stainless shaft adapter (3/8" step down).

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UPDATE Nov 28:

• Loctite added to all coupler screws (including flexible coupling from motor to three-way gearbox)
• Final leak check completed on replacement piping on service panel with the following results
  • baseline leak rate bottomed to 0.0e-10 Torr-L/sec within 7 mins and pressure bottomed to 1e-3 Torr within 5 mins.
  • baseline leak rate worsened to around 1e-9 Torr-L/sec by the end of leak testing, assumed due to increase in amount of trapped He in the line through testing
  • (time to detect [s] || peak leak rate [Torr-L/sec]) values for 3psi, 0.5s Helium using wand on top of hot cell
    • inlet side:
      • 20s || 3.8e-10 for nylon ferrule joint
      • 20s || 6.3e-10 for o-ring flange
      • 20s || 2.7e-10 for hansen NPT thread
    • outlet side:
      • 15s || 3.5e-10 for plastic ferrule joint
      • 15s || 5.1e-10 for o-ring flange
      • 20s || 0.8e-9 for hansen NPT thread

The target ladder was moved to the lift table in preparation for measurements.

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UPDATE Jan 03, 2025:

• Measurements (elevations) of the targets and alignment jig were completed over December to early January.
• Notes on measurement procedure:
  • Used the old alignment jig instead of new (easier to insert/remove)
  • Noticed that the target ladder potentiometer is jumpy at around 12 kOhm
  • Placed the jig between positions 4-5 throughout (pot reading of 11.65 kOhm places the jig in beam height - in line with protect monitor)
  • For left-right measurements, moved the alignment jig 'into-position' (i.e. set potentiometer value to 11.65 kOhm) to 'zero' the micrometer before changing ladder position (potentiometer value) back to the target being measured (turntable height not touched after zero-ing off to the jig)
    • For the entry side, because the protect monitor is obstructing, target 5 had to be measured above the protect monitor (jig also zeroed off above the protect monitor, i.e. not at the resistance value given above), while all other targets were measured below.
    • This introduces some error since we are measuring the target not in the beam position.
  • Target height measurements were done with measuring tape as normal.
  • Targets were measured with turntable flange having an angle of ~0.2 degrees, plumb bob and jig measurements taken with turntable flange 'leveled' as best as possible (angle of ~0.02 degrees)
    • For future measurements, the turntable should be also leveled before target measurements.
  • Levelling the turntable flange was done with a Digi-pass digital level (DW-1300XY, in absolute level mode, calibrated before starting)
  • By the cutout, the turntable flange is less stiff, causing level measurements to be tilted inward. We therefore relied more on level measurements on solid portions of the turntable flange as well as on the target flange.
  • Levelling bolts could be turned with target ladder seated.
  • If the turntable is not rotated, and only raised/lowered, the levelness of the table and target remained approximately constant (e.g. from 0.02 degrees change to 0.04 degrees as the turntable is lowered fully from fully raised).
  • If rotated, the turntable level changes significantly (e.g. from 0.02 degrees to 0.15 degrees)
  • The flange was re-levelled between entry side and exit side measurements for the plumb bob and alignment jig measurements
  • With new nuclear ventilation filters, flow inside the hot cell perturbs the plumb bobs and prevents them from settling.
  • Nuclear ventilation had to be turned off momentarily for the plumb bob measurements
  • Nuclear ventilation is returned when working on the hot cell roof
  • Nuclear ventilation is controlled by turning the toggle on the electrical disconnect panel from 'hand' to 'off' ('auto' setting assumed not used)
  • Respirator and lab coat worn throughout plumb bob measurement job, air survey done by RPG after job (confirmed OK)
  • Area also 'taped off' during plumb bob measurements to prevent non-worker entry
• The coupler exchange resulted in around a 0.4mm shift in the target heights
• A shoulder screw and wood clamp is used to lock the plumb bob jig in place (old screw/nut missing, no other components in toolbox provides locating fit for pivot joint on jig)
• Assumed new plumb bob measurements more accurate due to better/more accurate 'levelling' equipment (digital level).

At ~8am on May 06, the expansion tank level sensor for the T2 cooling system suddenly became noisy. 

Cyclotron fault ref: 16915

Approximately 11:00 am today, the noisy sensor was replaced with a spare, upon which it was learned that the spare sensor is broken (registers 0 level and not detected on PC through USB adapter).

The old (noisy sensor) was then replaced at around 12.00 pm onto the expansion tank and it was found that the noise had subsided.

A possible explanation to the noise would be loose connections/grounding wire.

We will continue to monitor the sensor in the coming days, and order replacement sensors has been placed and we will be able to replace the sensor soon should it become noisy again.

Edit 2024-05-07 - A. Newsome: EPICS monitoring shows the sensor appears to be behaving normally since the aforementioned events. Most likely attributed to improper grounding. The fault will be closed. See attached screenshot.

As of 2024-04-03, the BL1A Holding Tank water level is approximately 580L. It is recommended to drain the tank prior to the start of the operating year.

The lower amplifier for the T2 target station air supply was removed for teardown, inspection, and rebuild. 

The goal of this operation is to understand wear development in the air amplifier over ~13 years of operation, and potentially determine a recommeded service interval.

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The T2 volume was vented for an unrelated maintenance operation during this time.

During testing, prior to removing the lower amplifier, both regulators were set to ~20 psi. 

The upper air amplifier resulted in ~125 psi at the outlet while the lower air amplifier resulted in ~120 psi at the outlet.

The upper air amplifier had more audible air flowing out from the muffler than the lower amplifier. 

'Scratching' sounds in both amplifiers were comparable.

The following cycle times were recorded with the M20 BB raised/out (min:sec):

    UPPER: 1:22 / 1:00 / 2:06

    LOWER: 2:30 / 1:46 / 2:12

The following times were recorded to raise the M20 BB (sec): 

    UPPER: 8.36 / 8.76

    LOWER: 8.56 / 9.10

These times will be compared against after completing the teardown and rebuild of the lower amplifier, at which point this ELOG will be updated.

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UPDATE (Feb 23, 2024):

The lower air amplifier was serviced (photos in 'S:\Albert Kong\Shutdown Files\2024\Feb20 T2 Lower Amplifier Cleanup'):

1. Full assembly cleaning.
2. Piston and barrel was cleaned and lubricated, o-rings and plastic components replaced (with new lubricated ones).
3. Pilot valve components replaced (except plug).
4. Check valves (4x) cleaned and plastic/rubber components replaced (with new lubricated ones). 
5. Muffler cleaned (blown out with compressed air).
6. Spool and sleeve assembly cleaned, o-rings replaced (with new lubricated ones), and rubber stopper replaced.
7. Clamping rods tightened to ~17 ft-lbs. 

Note: the piston o-rings were difficult to seat on the piston body/teflon ring. During assembly, we instead seated the o-ring in the barrel on the piston plates (see picture), which allowed the oring to be seated properly, before placing the piston body onto the piston rod.

After servicing, the amplifier was returned to the station, air connections reconnected, and tested. 

Note: it is recommended to do torque-ing of the clamping rods as a final step to simplify mounting of the amplilfier and re-doing connections to the rest of the compressed air system.

The first observation we made was how silently the lower amplifier now operates when cycled: only the exhaust sound from the muffler can be heard.

Note that the piston's motion can be heard when listening ~5cm away from the amplifier barrel. 

The following times were recorded to raise the M20 BB (sec):

    UPPER: ~8.5 

    LOWER: ~7.7s

The following cycle times were recorded with the M20 BB in the out/raised position (min:sec):

    UPPER: 1:05 / 1:04

    LOWER: 1.22 / 1:45

The outlet pressure from the amplifier registers 120 psi with the regulator set only to 15 psi (improvement from previous performance as well as the upper air amplifier's performance).

We will check in on the amplifier next week to see if it still operates silently and can actuate the beam blockers/profile monitor without issue, at which point this ELOG will be updated. 

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UPDATE (Feb 26, 2024):

The lower amplifier was inspected this morning, higher volume sound could be heard from the drum in concert with the motion of the piston, but still much quieter than before servicing.