Today the voltage was raised from 65kV to 65.7kV. After about 10min at this level TM3 started current limiting. TM3 was not sparking when this happened.

ISAC OPS turned it OFF and then tried to ramp it back ON, but could not do it due to the current limiting.

I turned OFF/ON the PS (locally) 20ming ago and and then tried to get it back from the Control Room, but around 4-5kV it started current limiting.

Turned everything OFF on EPICS for the time being. We'll investigate on Monday.

Over the night the sparking rate at 65kV was from 6 to 2 sparks per hour. It tripped OFF once over the night: backing valves closed, tripping the turbos, tripping IG1 and turning OFF the BIAS. At that time ISAC OPS got it back smoothly.

Update TH schedule weekly to show the job process.

Aurelia and I investigated this current limit issue May 8th. First, By separating TM3 from TCS. we found the problem is on TCS side. We did a Megga test on TM3 as well. TM3 is good at 1KV megga test. After that, The insulators between TCS to ground is test. they are good which could hold 1G ohm at 1000V megga test. So the problem should be on power supply side  including power supply itself ,cables and transformer. Later, Tom and John found the TCS bias HV cable from power supply to HV chase top in faraday cage is broken down. It can not hold 5KV on HV test now. This cable should hold 100KV. But not this time. Tom also found  the adapter on Faraday cage could be designed in a better way. The broken cable was removed yesterday. John and Tom will order an exactly same cable from Glassmen.

TM3 service tray side panel is cleaned and installed back to TM3 this morning. I visually inspected service tray insulators. Nothing is changed comparing to inspection before.Nine screws are installed on  panel to hold it onto TM3.

 Neil Wong will fix this leak tomorrow Friday.  See attached schematics for location.

TM#4 with UC#20 has been moved from the south hot cell to the conditioning station.

Anders started TCS turbo-pumps yesterday. The TCS and TM4 pumping down is good so far. I started TCS water pumps this morning for TCS water flow check.

2017-05-17 morning:  Stopped the water pumps. The field around the TM4 is high because of spent target in SHC. The water flow measurement will be delayed to this Friday.

TM4 TP1 was found making some noise during operation this morning. The current draw was check then. It was 1.8 A which is higher than 1.0A normal range. The pump body temperature was higher by hand feeling. But,1.0 hour later when checking again, everything on the pump goes back to normal. It is still fine so far. I will watch on this pump closely.

 2017-05-19,morning.  The TM4 TP1 stopped running last night.  I tried to start it this morning. But, It can't pass 6KRMP even. I think we have to replace it.    E- fault will be issued as well.   

Electrical check of TM#4 with UC#20 at the conditioning station under vacuum. See attached for details.

TM4 TP1 is replaced. TCS and TM4 was argon vented before the job.The job took about 30minutes.  I started the all turbo pumps after job. All pumps work fine. The TCS vacuum is good.     

The results  are good. See attachment.

I started all turbo pumps.

The attachment can not be opened for some reasons. Please check TM2 leak check  2017-03-13 e- log for last time test result and comment.

Reconfigured TM2 gas line on the module top. It matches with the febiad gas line we are using on service tray now. Facing the module, both of them should be that right side line of two SST lines on feed-through. The gas line on TM2 was leak checked with a blind cap installed on service tray side and LD connected on module top this Tuesday. It is leak free with helium spray on the top of module and service tray.

Update TH MS project schedule. See attachment 1,2.

 TM#4 with Ta#52 has been moved from south hot cell to the conditioning station.

Turbo -pumps are started . The vacuum looks good so far.

Results of electrical check of TM#4 with Ta#52 at the south hot cell and the conditioning station under vacuum.

I started TCS water system.