Today while I was removing the SiC#43 it was noticed that the multipin guide pin was loose.

This made it difficult to remove the target, and the multipin shoulder bolts removal was required.

With the loose pin it was not possible to attach the multipin for the target C#4.

Chad was able to tighten the multipin guide pin enough, however it became obvious that the pin could not be removed when it was attempted.

With the pin tightened, the target C#4 was installed and all checks were good.

It was recommend that once the C#4 target is removed the TM4 will need some repair to remove the multipin guide pin. 

Chad - Also it was noted that the guide pin (ITA6453) in question showed signs of plating or heat (see pictures I've added)

 an electrical was done for TM4 with target C#4 installed on NHC.

TM4 HS line helium pressure test is done. 70psi helium pressure@ 3XE-8 atm.cc/sec . No leak.

 TM4 with Target C#4 was connected in ITE.

17-Oct-2022 Comment by David Wang: On OCt 14th, Replaced a flexible hose on MP1S pump exhaust port,but did not solve the issue. High frequency vibration was sensed by hand on MP1S pump inlet and outlet ports. Pump height and position in pit are adjusted slightly in pit to reduce vibration. After, ITHCG2 and ITW CG4SA got a huge improvement in past 3 days. All back up line pressure are stabilized at normal operation status. Still, close watching on this issue is needed to ensure the present status is stabilized in long term.

The issue was returned after shielding block installation Monday morning at 8:30am. Investigated further,  I temporarily installed a turbopump used cooling fan on MP1s to improve pump heat dissipation. And a room fan is put outside on shielding blocks opening hole to increase air circulation into pit. Since then,  everything is perfect. All secondary turbo pumps current draw is around 0.5 to 0.6A which is the best.  I guess that short duo 10 pump life we observed in past could be related to high pump operation temperature in pit as well. We may increase the pump life if air circulation around the pump could be improved. A permanent solution is needed for it.

Conducted PIE on SiC#44, which failed online. It had a cathode short, a target short and an anode short by the time we called the experiment off. In the post irradiation examination, two clear marks where the target legs touched the heat shield were found (see attachments 1 and 2). No marks were found to indicate where the cathode short would have been. The fibreglass sheath covering the anode wire where it passes over top of the coil was destroyed, must have been a result of sparking (see attachment 3). No other issues noticed, grid looked fine, though close inspection is difficult.

TM4 with C#4 was disconnected in ITE

TM4 was moved from ITE to NHC with C#4.

 TM4 with C#4 is checked on NHC right after moving from ITE.

The pin on TM4 has become loose again, making it very difficult to remove the multipin connector with the last target, C#4. For the installation of the next target, UCx#41, we will drill out the hole on the target side bracket so that it doesn't contact the multipin pin. Will try to remove this pin by force in January, or if needed change out the whole multipin bracket.

 an electric check and leak check done on NHC, TM4 with new target UCx#41 is ready moving to TCS.

TM4 was moved from the North Hot Cell to the Target Conditioning Station with UCx#41.

C#4 spent target was moved to the storage vault, in pail 277. Dose rate at approximately 1 m when leaving the hot cell was 164 mSv/h. The pail has been placed in vault location 4C. See updated vault layout attached.

TM4 was moved from the Conditioning Station to the East Target Station with C#4.

 TM4 with UCx#41 was connected in ITE on Tuesday (2022-11-29) 

Post irradiation inspection of C#4 which was running in TM4/ITE was conducted at the NHC on Nov. 22 2022.

The yields from this target had been dropping and its behaviour was erratic, with the voltages on the tube and target jumping all over the place sometimes. The ion current on the FCs followed the voltages. We took this to mean the target container was breaking down.

Upon inspection we found the container looked pretty damaged - highly crystallized and distorted. The container had gone banana-shaped, but not in the usual direction. It had curved  in the direction of the ion source (see photos). The heat shield and other surrounding components were super clean, no deposits or marks at all.

TM4 water lines helium pressure test was done yesterday at ITE. All water lines were air purged one day ahead  for the test. No leak  has been found on TM4 waterlines during the test. See attachment for detail

TM 4 has been disconnected in ITE.  See attachment for disconnection checklist.

TM4 electrical check with UCX41target and without target at SHC.  The results are good. See attachment.

ITE primary and secondary vacuum vessel air to vacuum seals leak check was done this week. One leak has been found on IG1S feed through to entrance module surface seal. It explains what we saw on ITE IG1S readings change(from low E-7 torr to 1Xe-6 torr) on December 22, 2022.  This leak seal will be replaced soon.

2023-Jan -27.  O-ring seal 229# was replaced on ITEIG1S feedthrough to entrance module surface sealing. Also o-ring seal 034# was replaced on the blank off cover beside the feed through to entrance module surface sealing. Since these o-rings are too close to each other. It is better to replace both of them to avoid misreading in leak check.