TM4 with TiC#7 was connected in ITW, all TPs are running at full speed.

 TM4 with spent target TiC#7 (dead) was disconnected in ITW and ready to move to TCS.

Tm4 has been moved from ITW to SMP. the move is successful.

TiC#7 failed after two weeks of operations - measurements in the electrical room indicated that the negative side of the CHT was broken (35kOhms to the rest of the target). This was likely due to a large number of proton trips during this target run. At every trip I could see the CHT voltage getting higher and more unstable. This cahnge in voltage was reflected in the unstable anode current and fluctuating RIB beam intensity, as a direct result of the fluctuating power on the CHT. The break was confirmed in PIE, loosening the screws caused the target container to come off without the cathode. Otherwise nothing unusual was seen. The anode wire connections seem very robust, dragging the target around with the multipin disconnected, flipping it up and down, etc and the anode wire stayed attached. Though we saw lots of outgassing on this target, things looked the normal level of dirty. There was no buildup between PE and EE.

 TIC#7 was placed in pail #294 and then moved from the south hot cell to the spent target vault spot 4B. It was 82.3mSv/hr when removed from the SHC. See attached PDF for details.

 TM2 with TiC#6 was checked on SHC, see pic attached pls.

TM2 HS line helium leak check is done. leak detector base LR 1.8xE-8atm.cc/sec.  helium pressure 70 psi. 5 minutes test. no change on LD leak rate.    I spray lots helium to gas line adaptor and fittings. No leak.has been found  at this base leak rate level.  Since the TCS MP1 has some  issue ,this time the base leak rate on LD only can get to 1.8Xe-8 atm.cc/sec at this moment instead of 0.0xE-9.  The low E-8  level is not perfect, but  i  have no concern on it.

 TM2 with TiC#6 was connected in ITW (FEBIAD), turbo pumps were started successfully.

 Gas lines pumped down at electric room for TM2 at ITW is done, leak rate 0.0e -8 <1.0e -3 T P pressure

Conditioned TM2 up to 48kV in ITW. Some sparks and current is not very stable. Drawing about 178uA at 48kV.

TM2 TiC#6 post run electrical check has been done at TCS. See attachment

PIE on TiC#6 was done in the NHC. The target assembly looked brand new when we took it out, no heating spots or deposits (pictures on docushare). Online we measured a 400kOhm connection between TGHT-TBHT-COIL to HV common (TGHT and COIL shorted in TM2 service tray) and anode was unstable above ~300V. After the module move and before the target removal David found TGHT-TBHT-COIL was a dead short to HV common and the anode was at 39kOhms to HV common.

1. Wanted to see if the TGHT-TBHT-COIL short was on the COIL. Measured with ohmmeter the COIL lines to HS and got about 700Ohms. But with the target lying down the COIL lines drop and touch the heat shield so to do this measurement Chad had to lift the lines, which could cause them to touch something else. So not sure how reliable this measurement was. It jumped around a lot, saw 0L occasionally.

2. Measured both target legs and tantalum gas line to HS, got about 5kOhms repeatedly using the ohmmeter.

3. Meggered across the gas line insulator to the gas line going into the target and got open circuit at 250V, so the gas line wasn't coated.

4. Target container looked vaguely red in the areas where the target material was, otherwise still no deposits on the inside. The container was not overly crystalized as seen on the legs and end caps.

5. Some sparking marks on the EE and some slightly asymmetric deposits

Continuing Aug. 22 2023:

6. Found what looks like a hole in the insulation on the COIL, maybe the cause of our short? Found a corresponding line mark on the copper plates that hold the coil down but not sure if it is related. Pics on docushare.

7. Grid looks perfectly new. Where was that current going?

8. Copper plates that hold coil were loose and bolts that hold coil in just fell out as well.

9. What can be seen of the anode wire looks good.

 TiC #6 moved from north hot cell to spent target vault placed in pail #232 put in spot 6A and the field was 151mSv/hr when removed from the north hot cell. See attached PDF for details about spent target vault.

 TM4 with target TiC#5 installed has been leak checked and electric checked on NHC.

 TM4 was connected in ITE.  pics attached FYI.

Yesterday and today module conditioning was done on Tm4 in ITE. This is the first ramp up after the shutdown and ITE is planned to run at high voltages for the first weeks. The module is behaving well - went up to 40kV yesterday, stayed there for an hour, and up to 46kV today. Current draw is 113uA at 46kV. No serious sparking.

Tuesday, May 23, 2023, 09:32 :  Ramping up again, easy to 45kV. Drawing 132uA at 49kV. Still behaving quite well.

When I tried to raise the anode voltage in cathode bias mode on May 23 evening, I found the target or tube shorted to HV common. Investigations in the faraday cage today showed the same. I removed all the new electronics (resistors, gemovs, etc) from the power supply to no effect, so I disconnected the TGHT supply and pushed it away from the busbars. There was still a short. David Frank and I then went down to the pit and disconnected everything to measure the module. The module itself showed no short, and the bus bars in the chase for TGHT showed no short, though the ones for TBHT still showed the short.

David and Frank reconnected the module and I disconnected the TBHT supply in the faraday cage, then I found no shorts to TGHT/TBHT. When I reconnected everything there were still no shorts. There must have been a short in the TBHT line in the faraday cage, and another short in the TGHT line in either the faraday cage or on the module top. Both these shorts got resolved by taking everything apart. Still not sure how it happened.

Next I found I could not raise the anode voltage above 230V, it looked like it was current limiting but since the current limit was high, I figured it had something to do with the new electronics installed. I disconnected them all the in cage and that solved the problem, and then reconnecting the gemovs that go from the PSU terminals to HV common caused the problem again, so I left those disconnected.

argon is being supplied at 6 psi to TM4. 

 TM4 with TiC#5 was disconnected in ITE and moved to NHC.

 TM4 with spent target TiC#5 electric check after moving from ITE to NHC.