Annual ITE water signal interlocks check is done with Rob Shank. All ITE water signal  interlocks work fine.

 the module with target UCx37 was disconnected in ITE.

TM2 with UCx#37 P2N target  was removed from ITE to NHC yesterday morning. The move is good.

 TM4 with Ta#64 was connected in ITE. see attachment please.

 TM4 with Ta#64 has been disconnected in ITE.

TM4 with SiC#44 installed developed a short TBHT to HV common during its first heating in ITE. Was fine before installation. Now with everything cold TBHT to HVC is 25kOhms. Removed short in electrical room, will rely on short in the module.

ITE:ANODE supply reading strange currents - 17mA with the power supply on and no voltage. Checked anode circuit from electrical room:

Anode wire in electrical room shows 0L at 250V

Circuit with 50kOhm resistor mostly looks good (49-52kOhms) but a couple times read 28kOhms, no idea why. Tried jiggling all cables, unplugging and replugging and everything looks fine.

But power supply still seems to be giving out signal for 17mA readback. Decided fastest to swap with TCS power supply and troubleshoot this one on the bench.

 TM4 with SiC@44 was disconnected in ITE.

 TM4 with Target C#4 was connected in ITE.

TM4 with C#4 was disconnected in ITE

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) 

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.

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.

ITE TP3,4, 1S,and 4S were started successfully this afternoon. All pump current draws  were below 1.5A . IG1S was switched on. I have no local controller so TP1 and TP2 on TM4 at  MSP can not be checked.  IG1S was hard to switch on at first. It timed out and showed error 09 code. I removed the connector back cap, and it could be switched on after. I will look on this issue. 

Turbo -pumps were stopped  last night at  6 pm. All four pumps worked good during check. For IG1S switching on issue, the problem either caused by over pressure(No TP1, 2 in ITE)   or because coaxial cable was pinched by connector cap and caused bad contact on pin to cable.   I modified the connector cap inside by opening more space for cable passing through the cap. The cap is installed back.   The gauge will be switched on next week again. We keep watch on it

Argon vented ITE station. ITEVV1S and ITGT SV3 were closed after venting.

 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.