The following tasks were completed:

1. Yesterday (Jan 18), the T1/T2 cooling packages were inspected for leaks and some moisture was found underneath the CUNO filters behind the resin cans on both T1/T2. It was determined that the source of the leak was a loose fitting on the drain valves of the CUNO filter housing (see photo). Today we confirmed that no more moisture is found underneath the CUNO filter after these fittings were tightened. A note will be made to keep this in mind for future shutdown operations.
2. The shaft couplings on the T1/T2 target ladder drive system were inspected: no cracks were identified on the rubber couplings.
3. Actuation of the T1/T2 profile monitors were tested. Vacuum levels at T1/T2 remained stable throughout (see picture).
4. The pneumatic connections/hose/fittings for the T1/T2 profile monitors, and M9/M20 BB were inspected - therere were some air leaks out from the ASCO valve + pneumatic flow control valve on the T2 profile monitor when it was in the down/out position. The same leak out of the pneumatic valve by the profile monitor connection was found at T1. Given that both profile monitors actuated properly however, these leaks were determined to not be an issue.

Next week, we will continue work by actuating the M9/M20 BB at T2, at which point this ELOG will be updated.

UPDATE Jan 30, 2024: The M9 and M20 beam blockers were tested, no leaks through the tubing were observed, actuation was quick, ops confirmed no perceptible change in 1A vacuum levels during actuation and EPICS reads correct blocker position signals.

Note: the M20 blocker was actuated by ops, while the M9/T2 blocker was actuated using the ASU on the B2 level of the Meson Hall. The ASU did not require the area to be blocked off to actuate the T2 blocker.

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Note: Ops noted that the profile monitor interlock status has to be reset if a timeout is encountered (such as if the pump were to be turned off or a trip was encountered) before the profile monitor can be actuated (see picture).

Note: When inspecting the system, we tried to open the rotary collimator air supply and the handle on the pannel mounted valve broke off (like it did for the T2 valve last shutdown - see picture). 

UPDATE Jan 30, 2024: The handle to the rotary collimator air supply valve was replaced (see image).

Note: There was also some small leaks at the hose clamps at the T2 profile monitor, in the out position. This leak was however smaller than the leak through the valve. 

The recently removed T1-MK1 target ladder was flushed with city water for ~30s at all target positions. It was then purged with compressed air at ~5 psi for ~1 minute at all target positions. We then left the target ladder in pos5 to fully extend the bellows and allow it to dry overnight.

This ELOG will be updated as we progress with work done to dry the target ladder and eventually exchange the spent targets.

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UPDATE (Feb 02, 2024): in the morning, the target ladder was moved to pos4, and air was allowed to run through the morning, in the afternoon the ladder was moved to pos2 and air was ran. At the end of the day, the ladder was moved to pos 0 and air was ran through over the weekend.

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UPDATE (Feb 05, 2024): the following procedures were completed.

1. the air connections on the target ladder was replaced with the leak test/vacuum connections as per instructions.
2. LN2 was taken from the ISAC-I facility and used to perform two pump-down cycles with the Agilent He leak detector + cold trap.
3. First pumpdown cycle: 3min45sec to go from roughing to fine pumping, left for a total pumpdown time of1hr20mins, a relatively small amount of ice formed on the cold trap cylinder (see image).
4. Second pumpdown cycle: 2min30sec to go from roughing to fine pumping, 4min30sec to reach 1e-3 Torr, 5min to reach < 1e-3 Torr. 
5. Due to good pumpdown in the second cycle, we proceeded with leak testing: Baseling 1.0e-10 Torr-L/sec | ~1 sec He applications at 3.5 Psi directed at fittings/welds/bellows. Worse case measured leak was 0.9e-7 Torr-l/sec in pos 13 of fig 12 of Document 46600 (see taken image for detailed measurements at various locations).

We will prepare an update to the procedure to better log the leak rate measurements and update this ELOG/the procedure. Note that ice removed from second pumpdown was actually comparable to the first (see image, ice knocked off during cold trap removal), but total pumpdown duration (including leak testing) was ~4 hours for the second pumpdown. 

 UPDATE (Feb 13, 2024): see attached record with new template.

 The recently removed resin can from the T2 target station was rinsed with city water and flushed with compressed air for 1 cycle. 

We will run it through a few more cycles before proceeding with drying under the fume extractor, at which point this ELOG will be updated. 

UPDATE (Feb 08, 2024): The T2 resin can underwent 3 more air cycles. Today it was moved under the fume extractor with the lid cracked open and will be left to dry till next shutdown. It is worth noting that some clumps of old resin was found in the secondary resin can which was previously under the fume extractor. This resin should be disposed of alongside the T2 can's resin once dried.

Feb 1 2024

Hand Pump observed to be losing pressure at full extension of cylinder, seals likely blown. Due to Enerpac P84 being an obsolete model, a newer model hand pump was ordered.

Feb 15 2024

Hand pump (Enerpac P84 Ultima) installed at Indium Extruder Station, observed to work properly in both directions of flow, deemed operational. 

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.

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.

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.