Returned work permit C2016-01-27-2 due to tank lid being raised and elevated fields make the work area un-favourable to work in. Work will resume to blank off the combination magnet flange when the tank lid is closed in March.

Tasks remaining:

- Inspect combination magnet flange, document valve stand

- Clean indium off of flange (if necessary)

- Install indium blank off and helium leak check

 On 8March2016, under W/P C2016-03-08-2, 4VQ3 was lifted out of BL4V with the vault orbit crane where it was first weighed then lifted onto the RH flat deck rail dolly.  It was then moved into the RH basement where it was surveyed before lifting it up onto the Red wagon cart in the RH loading bay.  It was then pulled to the Meson Hall loading bay by fork lift where and then over the Cycloton vault to the top of the E-Hall roof beams under the 10 Ton crane.  4VQ3 weighed 5900 Lbs. using Plants Groups "RON Load scale".  It was 60uSv/Hr @ 0.5 M on the upstream side with no contamination on the swipes.

The total accumulated dose received was 0.34mSv spread amongst 7 people.

See the attached photos.

 On 14March2016, 4VQ1&Q2 were removed from BL4V and lowered into the Vault basement B3 level where they were stored in the south west corner on their respective wood pallets.  The hot ends of both magnets were place against the west wall.  4VQ2 was lifted out first and moved temporarily downstream where it was separated from its magnet stand. Q2 was then craned into the basement where it was tipped 45^o to lay on the flat side of the magnet face.  Q2’s magnet  stand and it’s mounting brackets were then craned down onto another pallet and moved to the same storage area.

4VQ1 was pulled about 3-4 ft. downstream using a pair of ¾ Ton come-along winches to clear the overhead Elevating Jacks platform.   Q1 was then separated from its stand where both were lowered onto pallets like Q2 and moved to the storage area.  Four concrete shield blocks were postioned down stream of 4VCM1 to shield the beam exit port.

The total accumulated dose received was 0.46mSv spread amongst 5 people.  See W/P C2016-03-11-5 for Rad survey levels of Q1 & Q2.

See the attached photos.

Continued with work blanking off CM1 flange.

- Placed lead shot on left and right side of the CM1 flange to lower fields. No significant change, went from 2.8 mSv to 1.9-2 mSv.

- Inspected indium flange, some residue on 3 and 9 (left and right) clock sides of knife flange. No significant indium stuck on, some small cleanup done.

- Spare blank off test fitted, did not fit: rocking felt from side to side. CM1 flange seems to be ovalized. Test fitted an aluminum carrier ring (B-3471), fit. Difference in OD sizes is 5.560 vs 5.550 (indium carrier ring is smaller). Will skim blanking plate to 5.550" and reassemble blank off.

Work to continue next week.

Rolled indium into new blanking plate turned down to 5.550". Dry fit with no indium ok. Assembled hook eyes from the previous blank off plate (removed from the slits box?). Used the same 20.5 mm spring compression (1.5 turns of the nut from finger tight). Hooks did not move 100% completely freely, but seemed ok.

Blanked off CM1: Reused CM1 pin drive (was written on the pin drive) Pin drive was 500 uSv/h on contact. Working at beam plane level seemed to have lower dose rate. Drove down to 1/8" just before shoulder on taper. Intended to use WD-40 but can was empty. Vacuum leak check will have to wait until a later date.

2016 02 23: Attached scanned inspection report of as installed blanking plate.

 2022 Apr 28 to 29:

Installed a new remote handling 4" indium joint for new beamline 4 north section. Issues were encountered in clearance between the downstream steering magnet and the compression collar of the joint. Joint installation itself went smoothly. 

The drive screw is a 17mm hex instead of a 5/8". This was noted in the install of the blank off plate in 2016.

See attached pdf report for photos and more description.

4" indium flanges at the 2C rad hard valve were cleaned of the remaining indium by C. Ballard. Both upstream and down stream flanges were done, ready for installation of new valve.

Uncovered and placed bridges for 1a q12 q13 for doug's re cabling work. See WP C2018-02-13-2: work permit

1VQ4 & 1VQ6 beamtube was installed by UCN group. RH provisonally installed aluminum indium carrier ring with no indium into joint space with clamping collar and pin drive. Joint is currently connected but not vacuum tight. Joint will be sealed with indium at a later date, tbd.

Disconnected and removed beam tube from 1VQ4, 5, 6. 

- Q6 end had transition end removed with pin drive driven into the retracted position and left behind but indium joint was still intact.

- Retracted the pin drive from Q4 end and proceeded to drive apart joint using reversed pin drive. The joint was stuck and did not come apart using the drive out mechanism. The beam tube end was then pried apart leaving some indium stuck on the knife edge of the beam tube. The indium had to be "severed" to removed the beam tube. The aluminum carrier ring was left on to the adjacent device (IVM3). The hook collar was then removed and beam tube with transition flange (v flange to 4" indium) was then fully removed at this point.

- Aluminum carrier ring was then pried off the flange of the adjacent device, IVM3. The "fin" on the carrier ring was mostly bent after this operation. Most of the indium remained on the ring. Some scraping and cleaning of the flange and knife was needed.

- The beam tube + stuck on transition flange and indium carrier ring are being stored in the vault basement. Fields were 30 µSv @ 1/2m.

- A pin drive and hook flange were left behind bagged under the staircase near the 1VQ4,5,6 area for the subsequent installation of the new beam tube section.

Link to RPG survey map of work area here: https://documents.triumf.ca/docushare/dsweb/Get/Document-86363/dspage03692340282615393127.pdf

Fields around joint were 140 µSv on the south side of the joint, 850 µSv on the north side.

Re-installed indium vacuum joint for 1VQ4, routing installation. R. Kuramoto sprayed silicone grease on to the threads and bushings on pin drive. Drove down tapererd pins and stopped 1/16" short of old marker markings.  RK. Commented on the drive screw bending under load, reversed drive 1/2 turn to relieve the stress on the screw.

Contacted E. Dalla Valle to continue assembling beam line down stream and pump when ready.

continued with o ring replacement, replaced all relevant o ring seals on valve (valve body seal and actuator arm dynamic seals).

- valve re installed and services reconnected.

- valve cycled and checked; valve, limit switches ok.

- started T1 roughing pump at 15:25, will pump over night.

- RH setup and tools still on beam line, valve area not yet covered.

Assisted vacuum group with removing 1AVA8:

- uncovered valve area and set up remote handling bridge over valve.

- shut off pneumatic supply to valve to render valve in mid position (shut off valve in 1A tunnel). disconnected electrical services and air supply for valve.

- undid the two captive RH bolts holding top half of valve body. valve body was then removed and bagged. note that gate assembly is free of valve body, body is light enough to lift out by hand.

- valve swiped, 300 to 700 CPM found on removed portion of valve. level inside valve at beam line was 6 mSv. fields at bridge not higher than 400 uSv, see survey map.

work will be continued by vacuum group.

Job completed today and shielding block over valve restored.

- He leak checked valve and accessible up stream joints, no leaks found.

- J McKinnon checked power supplies for nearby steering magnets before and after covering valve. supplies working ok.

1) Quick connect fittings on the rotary collimator were leaking (the two red collared fittings in photo below).

Replaced quick disconnect connectors on rotary collimator with compression fitting unions and bypassed the bulk head on the collimator, water hoses are hanging loose.

1. (top) supply line has an additional union + spliced line 90deg section
2. (bottom) is return line

The hoses should be shut off at their supply and then disconnected by undoing the fittings, if the collimator is to be removed. 

2) Replaced leaking fitting on 1AQ9 water cooled indium joint. Copper refrigerator tubing that runs down the shielding block cable chase that feeds T1 from the water package. Replaced both return and supply section as they were corroded (joined) together. Unsure which is supply or which is return line, or if it matters.

Final state of top of collimator area in picture below, inlet and outlet tagged (2015 mar 5).

2015 mar 6: the replaced supply joint was leaking a small amount of water through one of the union joints, decided to remove both the suspect union joints and connect the metal hose to the copper line. Appears to be okay/dry.

Assisted beamlines in replacing 2 insulators on 1A Q15 magnet. #10 and #14 insulators were found to be leaking at the ceramic, where the stainless steel fitting joins the insulator. They were both replaced. During re-installation of the #10 ceramic, the VCR coil termination broke off the coil end and a new one with updated design (see TBP0379) had to be soldered back in its place. The original SS fittings are deemed to have problems in their construction and have been replaced over the years.

Video capture shows soldered fitting with a large glob of excess solder on bottom. Other photos show new fitting soldered in place and completed assembly of fitting with new insulator.

Today: D. Preddy completed another power test on 1A Q14, 15, 16 after all iron/steel shielding was restored. Magnet power and steering supplies were checked and O.K.ed. R. Kuramoto deems triplet repair job completed.

Tomorrow: B. Gasbarri and J. McKinnon want to take measurements of the T2 monolith to verify its position and compare with past data, no crane activities are to occur while this is being done.

Continued work on finding ground fault in 1A triplet magnets;

D. Preddy connected ohmeters to 1AQ14 & 15 power supplies with power leads disconnected. Ohmmeters were connected from magnet power leads to ground (pwr supply chassis).

- Q14 read 250 ohm and Q15 read 3 ohm.

- Disconnected power leads on Q14 and Q16 steering magnets. No change to ground faults.

Systematically moved wires off of magnets to find ground fault

- Moved north side asymmetric steering wire on live bus bars, no change

- Moved beam spill monitor (#57) cable, saw fluctuation in resistance on Q15.

- Moved disconnected thermocouple wire (from last year) on Q15, resistance change was observed.

- Moved thermocouple cable on coil #11, resistance change observed. No change on coil # 5.

- Resistance varied from 3 ohm to infinity.

Replaced RH bridge over Q15 shield block to facilitate re-installation of disconnected thermocouple.

- Removed RH bridge over Q15.

- Re-installed Q15 shield block.

- Re-installed 8' bridge over Q14 space.

- J. McKinnon reconnected thermocouple connectors & bound with Ø1/16" aluminum wire before covering. See photo.

Q14 re-covered with shielding.

- Cover plate on Q14 replaced.

- No water was found on beam line floor.

1AQ14 shielding restored and two lead panels replaced to cover T2 monument. See photo.

Tomorrow:

- Uncover Q15 # 16 to find ground fault.

Continued with work on finding ground fault on 1A triplet;

Uncovered Q15 & 16 to 1AS1 area. See photo below for setup.

Disconnected last years thermocouple cable (coil circuit #9) at connector, no effect on ground fault.

- Removed connector cable rad levels: 10 uSv @ 0.5m 100 uSv on contact. No removable contamination.

- Cable stored in hot block storage.

- Will re-connect in future date and left in 1A service chase.

Q15 ground fault appears to be in the cables running into the triplet service chase. Moving beam spill monitor cable (BMS #57) appeared to have most effect on resistance in ground fault.

- Chase and cables shown in photo.

- Wiggled beam monitor cable, resistance varied from 4800 ohm to infinity.

T. Moskven disconnected BMS #57 at control rack.

- No change to ground fault resistance, at 4800 ohm.

- T Moskven reconnected BSM control cables after days work was completed.

Compared Q16 power supply to ground for reference.

- Disconnected asymmetric steering power leads (1ASM 11A & B) to Q16 and disconnected Q16 power supply.

- Resistance measured at 0.470 M ohm from coil power lead to ground.

- Reconnected magnet power supplies after.

Discovered that the aymmetric steering leads (pyrotenax cable) on north side of triplet magnets feeding Q14 and Q16 are disconnected at Q16 power supply.

- D. Preddy recommends leads are unbolted at magnets. Leads appear above the four bus bars in photo.

Q14 resistance was at 250 ohm, Q15 resistance varied between 4800 ohm and infinity.