5shielding blocks have been transferred from ITE to ITE. ITW is configured to take proton beam.

5 Shielding blocks have been moved to ITE for next week TM1 move and RPG Radon test.

Dan and I moved 5 shielding blocks from ITE to block storage area. The move is smooth.

 Today the module was biased to 40kV in the conditioning station. The current draw was 0uA. Sparking started at 27 kV. I have attached the recording from the strip tool of the vacuum while we were testing. After consulting Pierre if we should take the module to a higher voltage it was decided not to. The purpose of this test we to check the interaction between the module, cover, new cooling line, EE and EINZEL cables. This test was considered a success and although there are no anticipated problems care should be taken when taking the module past 40kV for the first time.

 Roof blocks IRH1641, IRH1642, IRH1643, and IRH1644 have been fully assembled, labeled, and installed as per drawing IRH1652.  Fabrication of TCS shield block (IRH1646) and NHC module port block (IRH1645) is still in progress.

Dan and I transferred 4 shielding blocks from ITE to block storage area. The ITE pit is opened now.

4 shielding blocks have been moved out of  ITE to block storage area. Fiona did the survey and with me during the move.

Today:

1) Cleaned flange with methanol and cotton glove, appears to be clean.

2) Installed new beam tube and cradle into wall penetration, cradle was setup same as previous cradle (which is now removed). On advancing into position, the flange on the flexible bellows appears to get stuck on the spigot of the fixed tank flange. Removed and measured slot, is undersize (.373-.374), will re-machine slot for spigot.

3) On visual inspection, ITE tank flange appears to be warped in a location consistent with the clamping area of the window clamp. Further investigation is required.

Cleaned top of the ITE vacuum flange and top of window clamp. Attempted to clean the bellows/beam pipe through the wall, mostly dust and small particles. When cleaning bottom of the wall penetration we picked up a stone/fragment and the vacuum stopped. Appears to be a rock of some kind. 800cpm.

Videos on \\trwindata\groups\remote handling\Videos\2014\2014_2A3window folder, videos 3 and 4.

Continued with vacuuming inside wall penetration to remove debris. Changed filter bag in nilfisk vacuum, left old filter in place however vacuum continues to stall after >5min use. Vacuum gets quite warm before self shutting off. Debris seems to be falling back down on to joint if vacuum is turned off.

Took some screenshots of video showing removed debris and rust(?) on beam pipe. Video located on remote handling group folder.

Will attempt to remove clamp tomorrow.

Today:

1) Installed new cradle and shortened beam pipe section in wall penetration.

- Removed tank dust cover from flange and cleaned

- Held flange faces together from 2A tunnel side to check alignment, slightly biased to the East axially and a small gap present in the top when resting

2) Prepared new 2A window

- Connected preswaged  (1/2 turn) swagelok nuts to the existing copper lines in the target hall, 1/4 turn from finger tight, 3/4 turns total

- Leak checked cooling lines with pressurized air at 75psi and snoop, no leaks were found at the joint

- Grooves were cleaned and helicoflex delta seals were installed with vacuum grease used in the periphery to hold ring in window, applied at 6 points every 60deg

3) Window installation

- Lowered window into position by cooling lines

- Window located into tank flange first then slid beam pipe towards it, capturing the window with seals

- Lowered clamp into place in hole

4) Clamp installation

- Lowered clamp into access hole and started closing clamp with steel RH drive bar

- torqued to 50 ft-lbs collar gap was still ~8"

- Increased torque to 60 ft-lbs then 70 ft-lbs stopped closing of clamp when the displacement did not change between the stop ring and clamp yoke

- It was decided not to continue to close this clamp, more assessment may be necessary

6) We will attempt to pump on the seal in its current configuration, tools have been removed.

Video inspected 2a3 window joint this morning.

Screenshots from video showing debris forming around aluminum cradle and brown/red dust on top of beam pipe.

Inspection video can be seen in its entirety at \\trwindata\groups\remote handling\Videos\2014\2014_2A3window

Today:

1) Vaccumed top and around clamp. Disconnected clamp from flanges and removed from beam line. Currently bagged and stored in metal pail next to target pit area. Clamp is 500 µSv @ 1/2 m.

2) Removed 2A3 window from beam line. Pried apart joint from top of target station using pole tool. Window is 95 mSv o.c. 5000 µSv @ 1/2 m. Currently stored in a metal shield & covered with lead blanket infront of spent target vault.

3) Did preliminary clean of tank side flange with cotton glove. See videos in RH group folder. A mark still remains on flange.

4) Installed dust cover over tank flange.

5) Removed old leaking beam tube + support from wall penetration. Currently stored in 2A tunnel, both pieces are bagged. 500 µSv @1/2m, 12000 µSv o.c. Took 2 vials/samples of the deposits inside the plastic piping surrounding the beam tube supports. Material appears to be crystalline and moist.

Helium leak checked 2a3 window after installing using remote line:

- There was a leak found between the target and entrance module at the target pit, rate of 9E-6 atm-cc/sec.

- One test performed with the remote helium line to the window. There was a response but the leak detector was located above the window access channel, drift cannot be ruled out.

- 3 more tests performed with vacuum group, with leak detector relocated farther away from ITE and isolated with plastic. 2 tests using remote line had no response. One test done with a wand through 2a3 wall penetration had a response of 3.2E-9 atm-cc/sec (not using remote line).

Vacuum group (D. Yosifov) comments that due to the much larger leak at the top of the tank he cannot say with confidence the response seen is a leak at the window (due to leak at top) but if there is, a tolerable leak rate.

Yesterday we installed the 2a2 window, the drive screw was torqued until 70 ft-lbs and we stopped, the yoke is not fully closed to its hard stop with roughly 7/8" to 3/4" still to go. Similar to identical conditions to 2a3 beamline window install, see https://elog.triumf.ca/TIS/RH-ISAC/647 for that install. Otherwise clamp looks centered and installed correctly.

Concerns with the cooling lines for the window WRT to the base of the shielding plug: There is no jog bend indicated on drawings for the transition of the window cooling lines from beamline center to the corner of the shield plug penetration. See photo for cooling line position on initial removal of shielding plug. It was decided to not add a jog for the shield plug and to carefully reinsert it being mindful of the cooling lines.  The shielding plug has a chamfer on the corner to allow the cooling lines to be routed to the top.

A new beam tube cradle is being manufactured where the old one will removed and the new one swapped with the beam tube in situ. Both sides of the window still need to be leak checked.

prep'ed area for work:

- removed shield plug from window clamp area

- inspected clamp from tunnel side and from top of target station: video recorder was not working, will try again tomorrow.

- corrosion seen on beam pipe cradles, see photos. corrosion also seen on beampipe, clamp and vacuum tank. will try to vaccuum loose rust tomorrow.

note: gamma spec of rust, white powder from RPG located in \\trwindata\groups\remote handling\Documents\2014\2A3 Window folder (added pdfs as attachments 2014 mar 4)

Leak detector is connected to ITW TP4. LD Base leak rate 0.0XE-09 atm.cc/sec. Helium line is connected to existing window leak check 1/8 " copper tube. Applied 18psi helium for 1 minute. No response on LD. The window seal is good on ITW vacuum vessel. 

Anders and I leak checked new 2A2 window seal on ITW side. Leak detector was connected  to ITW TP4.  Base  leak rate 0.0Xe-9 atm.cc/sec. base pressure 0.0xe-4 torr.  Sprayed 15-20 psi directly underneath 2A2 window by using exist 2a2 window leak check copper tube. The leak detector got response in 5 seconds when helium was applied. the leak rate was 5xe-6 atm.cc/sec. Once the helium source was closed, the leak rate dropped quickly back to base level. To confirm the leak is at window , I sprayed 15 psi helium around all top flange seals of TM and entrance module.  There was no direct response during the spray( about 1.5- 2 minutes). There was a weak slow up response (up to 1.0 xe-7 atm.cc/sec) which was started after 1.5 minutes of spray. The weak response is cause by helium drift in my view.   Our conclusion is the 2A2 window seal on ITW side is not perfectly sealed.  The elak we saw on LD is ture , and it is located on window.  The station will be vented soon for shielding plug moving back. .

Transfered the 2A window from the ISAC Storage Vault to the Cyclotron Vault Tunnel Storage area. RPG storage form attached.

2A window has been removed from the vault and moved over the cyclotron vault tunnels.  Attached is the updated storage vault list.