 Tuesday, July 20, 2021, 09:46, Adam Newsome, ITE, Standard Operation, TM4, , Remotely moved TM4 from TCS to ITE
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TM4 was moved from the conditioning station to the East target station. |
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Friday, July 30, 2021, 16:19, Carla Babcock, ITE, Repair, TM4, Ta#62, Electrical issues on Ta62
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TLDR: TBHT voltage too high and rising too quickly with TGHT current - voltage limited. TGHT power supply tripped breakers somehow. ITE:EL not outputting voltage.
A short between feedthroughs A and P developed at the end of the p2n run in this module, and was fixed by Chad prying apart the lines in the source tray with a long teflon bar. We did not take the containment box off to fix it properly for reasons of time and also potential damage to the containment box. This seemed to fix it and David measured around 13MOhms between A-P when the module was installed in ITE. To make sure we could recover if the short reappeared during the run, David did not connect the P/Q feedthrough to HV common on the module top as usual, but it was connected in the electrical room. I also unhooked the busbar from the coil power supply.
When trying to start the TGHT ramp up, it was discovered that ITE:TGHT had a fault in its readback circuit, which was showing negative voltages. Not sure how this happened, since the power supply was not used for the previous p2n run, maybe an HV spark? This supply was replaced with the spare (SN 1161-9894).
When TGHT and TBHT were able to be ramped up, we found that the tube heater voltage was increasing too much with the target current. Normally the rate of increase is about 0.0004 V per amp on TGHT. This time it was 0.004 V/A. This was causing the TBHT to be voltage limited, which I thought could be related to the AP short. So I re-wired it such that the P feedthrough (#7 in the electrical room) was disconnected from everything except it was tied to feedthrough A (#1) using a 100 Ohm resistor. This should prevent it from floating and also prevent current from going through. See documentation in the Target Records folder (https://documents.triumf.ca/docushare/dsweb/Get/Document-204373/July272021_ITETM4_electricalissues.pdf).
During the subsequent ramp up, the TGHT power supply tripped the breakers when it was at 500A, 8V. The cause of this is still uncertain, and the TBHT voltage issue persisted after the wiring change. In the interest of time we decided to stay conservative on the currents used and continue to run like this. It may also be possible that the copper block which is supposed to reference TBHT negative to HV common is not attached.
Finally ITE:EL is still not working. It shows a value on the front of the PSU but doesn't draw enough current and doesn't affect the beam. We are running without it and it will hopefully be fixed on the Aug. 4 maintenance day.
These electrical issues bear some resemblance to those with Ta61, but I don't think we ever determined the cause there. |
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Tuesday, September 14, 2021, 09:18, Travis Cave, South Hot-Cell, Repair, TM4, SiC#40, Module move
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TM#4 with SiC#40 has been moved from the east target station to the south hot cell. |
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Wednesday, September 15, 2021, 08:39, Travis Cave, ITE, Standard Operation, TM4, SiC#41, Module move
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TM#4 with SiC#41 has been moved from the NHC to ITE. |
Friday, September 17, 2021, 12:20, Frank Song, North Hot-Cell, Standard Operation, TM4, Sic#41, TM4 SIS with Target and No external Connections 
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TM4 electric check with new target was done by David. A pic attached here for ref. |
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Friday, September 17, 2021, 12:34, Frank Song, ITE, Standard Operation, TM4, Sic#41, Module Connection
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TM4 with a new target was moved back from NHC to ITE and reconnected at pit. The 5 shielding blocks were installed as well. Copies of connection checklist are attached here. |
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Monday, October 04, 2021, 09:37, Frank Song, ITE, Standard Operation, TM4, Sic#41, module disconnection
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TM4 was disconnected and moved to NHC. |
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Monday, October 04, 2021, 10:52, Travis Cave, North Hot-Cell, Standard Operation, TM4, SiC#41, Module move
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TM#2 moved from ITE to NHC SiC#41 removed and then moved back to ITE. |
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Friday, October 08, 2021, 11:19, Frank Song, North Hot-Cell, Standard Operation, TM4, UCx#35, TM4 IGLIS target electrical tests
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the tests were done when TM4 was on NHC. see attached photos please. |
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Friday, October 08, 2021, 12:39, Frank Song, ITE, Standard Operation, TM4, UCx#35, Module Connection
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the module with target UC#35 was connected in ITE and being pumped down. |
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Tuesday, October 26, 2021, 11:01, Frank Song, ITE, Standard Operation, TM4, UCx#35, shielding blocks transfer
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the five shielding blocks have been moved from ITW to ITE. |
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Tuesday, November 23, 2021, 10:46, Frank Song, ITE, Standard Operation, TM4, UCx#35, module disconnection
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the TM4 with UCx#35 was disconnected in ITE. |
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Tuesday, November 23, 2021, 10:58, Adam Newsome, South Hot-Cell, Standard Operation, TM4, , TM4 Move
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TM4 was moved from ITE to SHC. Shield plug installed in ITE. |
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Wednesday, November 24, 2021, 07:17, Frank Song, South Hot-Cell, Standard Operation, TM4, Ta #63, TM4 SIS with Target and No external Connections
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the TM4 with new target Ta #63 installed in SHC and an electric check was made by David. |
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Wednesday, November 24, 2021, 09:08, Adam Newsome, Conditioning Station, Standard Operation, TM4, , Remotely moved TM4 from SHC to TCS
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TM4 was moved from the South Hot Cell to the Conditioning Station. |
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Thursday, November 25, 2021, 10:33, David Wang, Conditioning Station, Standard Operation, TM4, Ta#63. , helium pressure test on TM4 HS line at TCS.
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Helium pressure test on TM4 HS line at TCS is done. LD base leak rate 0.0 xE-9 atm.cc/sec. Helium pressure 70psi. HS line had been helium pressurized for 5 minutes during the test. No response on LD. HS line with Ta#63 is leak free. |
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Tuesday, November 30, 2021, 11:03, David Wang, ITE, Standard Operation, TM4, Ta#63., Remotely remove TM4(Ta#63) from TCS to ITE.
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Remotely remove TM4(Ta#63) from TCS to ITE. The move is smooth and successful. |
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Tuesday, November 30, 2021, 12:51, David Wang, ITE, Standard Operation, TM4, Ta#63., Tm4 has been connected in ITE.
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TM4 has been connected in ITE. See attachment for checklist. |
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Wednesday, January 05, 2022, 09:38, Frank Song, ITE, Maintenance, TM4, Ta #63, TM4 SIS with Target and No external Connections
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electric check done in ITE. |
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Thursday, January 06, 2022, 13:54, David Wang, ITE, Standard Operation, TM4, , helium pressure test on TM4 internal cooloing lsine at ITE.
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Helium pressure 70 psi. 3 minutes on each circle untill LR on LD is balanced. Base leak rate on LD:0.0xE-9 atm.cc/sec. The result:
A: slowly to1.8Xe-8atm.cc/sec after 2 minutes and balanced there.
B: slowly to 2.0XE-8 atm.cc/sec after 2 minutes and balanced there.
C: quickly response to 3.1XE-8 atm.cc/sec and balance there.
D : slowly to 3.0X E-9 atm.cc/sec and balanced there.
All others including coil1, coil 2 ,MSP, EE, HS, window are perfectly leak tight. No response on LD.
The leak rate on A,B,C,D are in low E-8 or E-9 atm.cc/sec range. They should seal cooling water without leak. No concern.
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