On Wednesday, May 22, 2024 UCx#45 was installed on TM4 in the SHC. Installation was normal other then minor issue with the multipin connector drive screw not engaging and/or driving properly. This was remedied by loosening the left guide bolt slightly (1/2 turn). After loosening the multipin drove in and seated correctly (verified by camera). High current fasteners torqued to 130 in lbs.

 To deliver stable beam to RadMol, started heating UCx#43 up again. Target was overheated during initial conditioning in Nov but then ran well for 4 weeks. During the run time, the TGHT voltage jumped around and this was reflected in the ion current, but yields seemed unaffected.

When re-heating it, the TGHT voltage was very unstable and once it got to 440A, it went into voltage limiting mode. We ramped down and it was still voltage limiting, but turning things off solved it. We ramped back up and it did about the same thing. TBHT voltage and current remained steady. Looks like a heat generated issue.

Measured the resistance in the lines from the electrical room. Resistance of the lines to ITE should be 1.19mOhms for TGHT and 1.95mOhms for TBHT. TBHT positive to negative had a resistance of 7.9mOhms from the electrical room today, and 5.7mOhms on module top when measured Nov. 8. This seems to track.

TGHT positive to negative was measured at 27.6mOhms today (and was jumping around), whereas it was 7.14m Ohms on Nov. 8.

10V @ 440A is 22.7mOhms, so it makes sense that it limited. Tried with increased voltage (up to limit of 16V) but this didn't help. Declared the target dead on Jan. 11.

David measured resistances on the module top and found (in mOhms):

A-B = 27 (TGHT)

A-C = 7.473

A-D = 6.380

B-C = 26.053

B-D = 25.569

C-D = 5.212 (TBHT)

So looks like the tube is broken on the B side.

UCx#43 PIE was done in the SHC. As expected based on electrical measurements, the target container was broken on the right side and came off easily. Despite all the black stuff seen on the containment box and source tray, the inside of the heat shield was very clean. Checked if the Re foil was curled in and didn't see anything. Looked fine other than the broken container.

Starting at 11:00 am and finishing at 12:10 Ucx#4 previous target was removed and UCx#4 installed and leak checked on TM1.

During module move to the hot cell UCx#4 was housed in a bag under argon.

 TM4 with UCx#37 was connected in ITE. Attachment available.

UCx#30 has been installed onto TM4 with new high current fasteners torqued to 130 in lbs.

UCx#3 was packaged into a spent can, double bagged and the bag and cans filled with argon as much as possible. Lid was attached and can moved to the storage vault. The target was placed in in Pail 93, and placed into slot 1C of the vault, it was 11.7mSv/hr when removed from the south hot cell. See attached file for latest vault details

UCx#3 has been installed on TM1.

Leak check also complete.

Base Leak Rate 0.0 x 10-9

Pressure 0.0x10-4

Two checks on upper heat shield joint - no response (2 sec spray/check)

Two checks on lower heat shield joint - no response(2 sec spray /check)

10 sec flood of all heat shield joints - no response

Electrical check coomplete.

An autopsy was performed on UCx#3 yesterday afternoon. This autopsy followed the plan written by Anders. Indeed, both sides of the target oven had seperated from the central block.Pictures were taken by Anders and Pierre.

After the disection the target was placed back in a can under argon. Any small piece were placed in a zip lock bag and also put in the can under argon.

chad fisher wrote:

An autopsy was performed on UCx#3 yesterday afternoon. This autopsy followed the plan written by Anders. Indeed, both sides of the target oven had seperated from the central block.Pictures were taken by Anders and Pierre. After the disection the target was placed back in a can under argon. Any small piece were placed in a zip lock bag and also put in the can under argon.

Pictures are available on DocuShare:

https://documents.triumf.ca/docushare/dsweb/View/Collection-8189

ISAC e-log entries:

https://web.accel.triumf.ca/isac_elog/Elog_shift_view.pl?shiftid=10803

See attachment for autopsy plan.

UCx#29 has been removed from TM$ and placed in a pail backfilled with argon until it can be moved to the storage vault.

UCx#28 has been removed from TM4. Guard screws on 5(10) pin connector had to be removed to get the connector to un-seat properly for removal.

Dummy Ta target has been removed from TM4 and UCx#27 installed

UCx#19 has been installed onto TM4. High current fasteners torqued to 130 in lbs. Has been leak and electrical checked and is ready to leave hot cell.

On Thursday, January 26th UCx#18 and Ta#50 were inspected and packaged into spent target pails, move to storage vault.

UCx#14 has been removed from TM4 and Ta#47 installed. No marks on 9 pin connector on UCx#14.

UCx#14 installed onto TM4. High current fasteners torqued to 130 in lbs.

UCx 29 TM4 post run electrical check is done before target is removed. Everything is normal on measurements.

See attachment

TM4 HS Leak check result is good . No leak. electrical check after target installation: Bias to chassis 550 Mohm. Coils are shorted each other and shorted to 60 KV bias. ABCD to 60KV bias 500V Megga measurement are 100M at least which is good. EE to bias are OL at 500V. The electrical check result is good.