The following work was completed today on the EHD water leak sensors:

• Mike Vogel installed a 1/4" copper tube which leads from the east side of the EHDT shielding down to the catch tray below the water blocks.  This can be used for future testing of the in-tray sensors without removing the shield blocks.  It may also be possible to test the other sensors if enough water is poured into the tray for it to overflow and eventually get them wet.  The routing of the copper tube is not expected to interfere with the vertical shield plug
• Ray Mendoza re-located the SMT circuit boards to a rack on the north wall of the E-Hall, east of the concrete shield wall.  The push-connect terminal on one board was damaged, so there is currently no electronics installed for EHD:LEAK06  (After various debugging over the last couple weeks it was eventually determined that the previous problems with these sensors was caused by a shared power source for the relays and the sensors themselves.  Ray installed a dedicated 9V power supply for the sensors, with 24V supply to the relays still coming from the PLC)
• We swapped the wiring of two of the sensors so that LEAK01 and LEKA02 are the strips located in the tray as specified in interlock spec Document-112445 (see below for details of final installation)
  • Inside tray east side sensor is cable #4, wired to EHD:LEAK01
  • Inside tray west side sensor is cable #2, wired to EHD:LEAK02
  • Outside tray east side sensor is cable #3, wired to EHD:LEAK03
  • Outside tray west side sensor is cable #1, wired to EHD:LEAK04
• After the wiring was completed we shorted across each sensor in the junction box near the beam dump.  EHD:LEAK01 through LEAK05 responded as expected

• Water was poured into the 1/4" copper tube to test the sensor strips in the tray.  After approximately 50mL sensor #2 triggered, and #1 triggered after approximately 100mL total.  Both sensors were still in alarm 5 minutes later.

• Water was applied to sensor #3 (outside tray, east side) using a snake camera with plastic tube attached.  Approximately 50mL was applied;  The sensor triggered once after a small amount of water reached the strip, came out of alarm, then went back into alarm when more water was applied.  It stayed in alarm for approximately 1 minute then cleared

• EHD:LEAK04 (outside tray west side) was triggered by pouring water onto the ground in the general area of the sensor (direct application with the snake camera was not possible). 125mL was initially poured which did not trigger the sensor.  An additional 125mL was applied which triggered it.  More water was added to the LEAK03 sensor to confirm that the system behaves properly with all 4 sensors in alarm

•  Air was forced down towards the sensors using a shop-vac hooked up in reverse.  LEAK03 and LEAK04 cleared within a couple minutes.  LEAK01 and LEAK02 cleared in approximately 2 hours.

 Powered down ARIEL Target Hall Crane today by switching off main power switch on B1 level in preparation for site-wide BC Hydro power outage on Dec. 27-29.

 BL4N 35-deg bender magnet "No. 1" has been installed onto the magnet stand with "stand leg" configuration in the Proton Hall Extension loading bay area.  The magnet fit as expected, and with the support legs resting on the ball transfers the magnet position could be easily adjusted by turning one of the adjuster leg fasteners (with the others loose).  After experimenting with position adjustment, the fasteners were torqued to 70ft*lbs.

The engineering analysis (Document #138415) as well as drawings TBP1804, 1805, 1806, 1811, and 1820 are in the process of being updated to reflect all as-built changes.

Assembly of two complete bender stands was completed on Friday June 2nd as well as installation of new hardware on the dipole magnets for support, adjustment, and seismic restraint.  All parts were installed according to drawing TBP1804.

One of the frames was assembled with the caster wheel configuration.  This frame was pushed from the proton hall B2 level to its final installation location in the ARIEL tunnel.  The frame was a tight fit around the first corner around BPM 26 but it could still pass by without having to remove any items including the electrical boxes on the right side of the tunnel (when facing towards ARIEL).  Part of the grouting for the BPM 26 support stand and the next three stands after that was ground away to allow more clearance for the frame.  The nut/bolt on the frame casters on one side were swapped which also provides an additional ~1/8" clearance.  After these modifications the stand was pushed out past this area and then back to its installation spot confirming that there is now ample clearance.

The other frame was assembled in the configuration with stand legs.  This frame has been moved to the proton hall extension loading bay to be used for magnet field testing.

Both dipole magnets have been assembled with the new adjuster blocks and support legs.  For the magnet labeled “No.01” the original support legs were removed, cleaned in the ultrasonic cleaner, and then reassembled with way oil  The support leg support pads (TBP1822) were replaced with new parts, but all other parts were reused.  For the other magnet, labeled “No.03”, new support legs were fabricated because it was supported differently in its previous location and did not have these parts.  The fasteners attaching the adjuster blocks and support legs to the magnets were torqued to the recommended torque for each fastener based on the fastener grade and size.

Various minor changes to the design were made since the release of drawings, primarily to improve ease of manufacture.  As-built drawings will be released after the magnets have been installed on the stands in case additional changes arise.

Adjustment blocks were installed on the second dipole bender today (labeled "No. 03" "C15-III-57/15").  The mounting holes on the magnet were not aligned properly, so modification was required for two of the blocks.  The counterbored holes on TBP1809 were slotted 0.10" vertically, and on TBP1808, 0.06" horizontal slotting was required.  A stress analysis was performed to confirm that the blocks are still strong enough to withstand the seismic loads (PDF attached).

 Hardness testing was performed on 1 sample each of parts TBP1822 and TBP1823 (part of the 35-deg magnet stand assembly TBP1804),  They were found to be 60-60.5 Rc and 60-61 Rc respectively which is within spec.  The alloy used to fabricate these parts was AISI #8620. The testing was performed by Precision Heat Treat in Surrey who also performed the heat treatment at an earlier date.

On March 29, 2017, a 9 tonne steel shield block was transferred from the ARIEL Target Pit and placed into a 
wood container on the Target Hall B1 level with the overhead crane main hoist in Local Mode without incident. 
Afterwards, the overhead crane was switched into Test Mode (which is the same as Remote Mode but without the 
Target Hall interlocked) and an attempt was made to transfer the shield block from the wood container on the B1 
level to a wood container in the Target Pit remotely with the main hoist. At 11:51:09, after lifting the shield 
block ~1 m above the B1 level, a "136. Main Hoist West Drum South Motor Drive Fault (900 VFD)" alarm pop-up was 
shown on the overhead crane HMI in the crane control room which disabled the controls on the remote console. 
The reset button on the remote console was pressed and the remote lifting operation was resumed briefly until 
the same fault occurred at 11:51:42 and the reset button was pushed once again. While attempting to lower the 
shield block back down to the ground this fault-reset sequence reoccurred at 11:57:25, 11:58:16, 11:58:28, 
11:58:43, 11:59:27, and 12:00:27, at which point the remote crane operation was aborted and the shield block 
was lowered down to the Target Pit floor with the main hoist in Local Mode, without incident. The Test Mode 
faults did not appear to depend upon the speed/acceleration of the lift, nor did they appear to be spaced apart 
by a fixed time interval. Upon closer inspection of the alarm history screen in the HMI (shown below) and the 
exported alarm log (attached below), almost every time the fault #136 occurred, the following three additional 
faults were logged simultaneously in the alarm history (but were not displayed as a pop-up on the main HMI 
screen):
"103. Main Hoist East Drum North Motor Drive Fault (700 VFD)" 
"104. Main Hoist East Drum South Motor Drive Fault (800 VFD)" 
"135. Main Hoist West Drum North Motor Drive Fault (1000 VFD)" 

On March 31, 2017, the overhead crane main hoist was operated once again in Test Mode; however, no load was 
connected to the hook block to determine if the faults that occurred two days earlier could depend on the load. 
The main hoist hook block was remotely lowered ~3 m below the upper 'home' position, and then remotely raised 
as high as possible to function test the upper limit switch in remote mode; at 14:21:05 immediately after 
initiating the 'hoist up' motion, the same four faults occurred simultaneously. This incident shows that these 
specific faults do not depend on what load is connected to the hook block. Note: the crane position data from 
March 31 is attached below, however the times shown are 1 hour fast due a DST adjustment error.

Follow up with the crane supplier, COH, is required to obtain a index and troubleshooting guide for these (and 
all other) fault codes.

2017-04-06 update: Sylvain Raymond of COH has been assigned to resolve these crane faults by Maxime Dubé-Blanchet 
of COH.

On Tuesday, February 14th I finished modifying Jason's boxes for the remote crane tests by adding shelves to mount cameras... Apart from given the edges a quick sanding (so no one gets slivers)...which I will try and do tomorrow.

 In August 2014 gasket corrosion tests were prepared by placing a 1" Swagelok VCR gasket in a 500mL beaker with de-ionized water and a 1"x3/4"x1/8" piece of 6061 aluminum.  Tests were prepared for a silver plated 316L SS gasket (Swagelok PN: SS-16-VCR-2), a silver plated nickel gasket (PN: NI-16-VCR-2), and a TRIUMF made 0.060" thick 6061 Al gasket.  The top of the beakers were sealed, and they were left to sit until March 2016.

The Nickel and SS gaskets show no noticeable corrosion.  The aluminum gasket became dull in colour, with some corrosion visible on the surface.  See attached photos of each gasket.  The gaskets have been bagged and stored with beam dump spare parts in the NW corner of the RH Meson Hall hot cell lab.

Two small (approx. 5 cm across) puddles of green fluid were discovered on the floor, directly below the crane trolley.  The hook block was lowered and inspected.  No fluid found on hook block.
The plant group (Neil Wong) was notified and asked to schedule an inspection when the maintenance crew is on site to inspect the ISAC target hall crane.

The crane bridge and trolley were moved to another position on Friday evening and parked over the weekend.  The floor directly below the crane trolley was inspected on Monday morning.  Three very small (1-3cm diameter) puddles of green fluid were found.

During the maintenance period today the E-Hall tunnel was accessed to begin controls tests on the beam dump water system and initial fill of the system.  This work was done by Bill Richert and Dave Morris while I observed.  Before work began I verified that pressure relief valves were installed as per the P&ID (TEL5104 Rev A) - they have been installed but the exhaust ports from the valves have not yet been routed to the active drain.  They first tested the hydrogen venting and measuring system in the E-Hall and all seemed to work properly.  Next, in the tunnel Dave confirmed that he was able to actuate the solenoid valve used for filling the system from EPICS.  Next the pressure sensor used to determine expansion tank level was tested - although not calibrated properly yet they were able to confirm that it is wired correctly and responding as expected.  Upon inspection of the pump it was found that the pump motor was not mounted properly to the support plate below (this should have been done by the supplier before delivery).  Because the pump cannot be run in this state it was decided not to fill the system at this point.  Bill Richert will have the pump properly mounted before the system is filled, possibly during the two day maintenance period next week.

The location of the already installed blocks including the TSH0392 protruding lift bails were remeasured, and it was found that modification of the Standard Lock-Block Flat Top block was not required.  A Standard Lock-Block Flat Top block was installed in the place of TSH0487 in drawing TSH0372, and the remainder of the blocks on top were installed.  It was a tight fit for the lower two Half Height Lock-Blocks, but future removal of the BD shielding and SS plug should still be possible.  Drawing TSH0372 will be updated to reflect as-built status.

- The hoist rings were removed from the upper lead shield
- Two standard lock-blocks were installed over the E-Linac beam dump according to TSH0372
- 5/8" of shims were required on the north end of both blocks to make them level.  Aluminum shims were used (1/2" + 1/8")
- The service stand plug was also installed using a cable sling and chain-fall pulley setup prepared by Neil Wong (tight fit with surrounding shielding, but the install went smoothly)
- No change in EHDT vacuum (approximately 3.0E-8 Torr)
- The modified block TSH0487 is now required.  Installation will continue once it is ready.

- Vacuum has been pumping steadily on the EHDT section since June 8, reaching 3.2E-8 Torr at 8am today (June 12)
- Leak check performed this morning by Anthony Ip: no leaks
- Vacuum vented and re-pumped, leak check repeated: no leaks
- Reached 5.0E-7 Torr by 9:20am

Installation of shielding over the beam dump will begin next Tuesday.

A leak test was performed on the beam dump water system on June 9 in the afternoon.

- Pipe segments tested: The entire HAW system except for the expansion tank, air separator and HAW pump
- Test medium: air
- Test pressure and duration: 60 minutes at 50psi with no loss in pressure
- Swagelok joints and VCR joints around the beam dump which had been opened since last test were sprayed with Snoop: no bubbles