ITE TP3 is replaced. ITE is under vacuum again. All turbo pumps are started successfully. Current draw on pumps are normal so far.

ITE venting is in processing.

They work fine. Current draw on all pumps are normal. I asked operator to switch on IG1 , IG1S and PNG4.

 TM#4 with the P to N target has been moved from the south hot cell to the east target station.

Target Ionizer tube cooling lines "C" and "D" in Target Module 2 were both leak checked at the Hot Cell.  The lines were both blanked-off.

Bill Paley was present with David Wang in the Target Hall, operating the leak detector.  Grant Minor and Anders Mjos were present with Chad Fisher at the Hot Cell.

The "D" circuit was already blanked off with a copper blank containing silver brazed stainless steel inserts and indium plated inconel c-seals.

The "C" circuit was already blanked off with an aluminum blank and rubber o-rings.

The cooling lines are indicated in the attached screencapture from ITA6021 Rev .14, and are also labelled in the attached photo.

The "D" circuit was checked first, starting at around 12pm.

1.  The helium flow was tested by blowing dust on the work table.

2. The base leak rate on the Varian leak detector was confirmed in the "D" circuit to be stable at 10^-9 atm cc / sec and the pressure was 10^-4 Torr.

3. Each soldered joint on the "D" circuit was sprayed with a 2-second blast of helium - no response at the Varian.

4. The joint between the module-half of the water block and the copper blank-off was sprayed with a 2-second burst - no response.

5. A general area flood of helium sprayed for 10 seconds was applied all around both the "D" and "C" blocks - no response.

It was concluded that the "D" circuit had passed this leak check.  The "C" circuit was checked next.  The detector was changed to the "C" circuit and the circuit was pumped down.  At around 2pm the leak check resumed.

6. The base leak rate on the Varian leak detector was confirmed in the "C" circuit to be stable at 10^-9 atm cc / sec and the pressure was 10^-4 Torr.

7. The solder joint area on the "C" circuit was sprayed with an 8-second burst of helium - no response.

8. The joint between the two halves of the water blocks was sprayed with a 6-second helium burst - no response.

It was concluded that the "C" circuit had passed this leak check.

The electrical continuity of the "C" and "D" circuits were confirmed in the Target Hall at the service cap, and in the module at the Hot Cell, to double check that the correct lines has been pumped and leak checked - this was OK.

The ionizer tube heater lines appear to be leak tight at the Hot Cell.

TM#2 with no target and no source tray has been moved from the conditioning station to the north east silo.

Wednesday, October 14, 2014

 The BIAS voltage was brought up between 1:30pm and 5pm. Sparks tripped the BIAS power supply at voltages between 20 - 24 kV. Multiple attempts were made. The current was about 50-60 uA.

Wednesday, October 15, 2014

Temperature in the cooling circuit is too hight to do a HV test. The cooling circuit was started, but shuts off after ~10 m

Thursday, October 16, 2014

David and I found that the fans on the cooling unit on the roof did not run and that the compressors get hot and likely trip on over temperature protection (hot to the touch). We found the manual in the control panel of the unit.

10am: HV to 20kV before a spark tripped the PS. Current at 40 uA - resistivity at 11.9 Mohm

5pm: HV to 20kV before fluctuations in current, then a spark tripped the PS. Current around 40 uA. Resistivity 12.6 Mohm

Friday, October 17, 2014

8am: Staging did not start over night. TS5 temp is 31 deg C, which would have tripped power supplies. Reset and enabled staging.
The system increased staging until all 3 compressors were running.
9am: Cooling supply temperature reached ~3 deg C. Disabled staging and switched off all pumps
2pm: Switched off water circulation for the weekend.

TM#4 from south hot cell to the conditioning station no target is attached to the module.

TM#4  with no target has been moved from conditioning station to the south hot cell.

TM#1 with no target has been moved from the south west silo to the south hot cell for the installation of the UCx target.

TM#2 with no source tray has been moved from the north east silo to the south hot cell.

Wires for TM#2 steering elements, and png gauge have been run down to the containment box level. Chad has placed them in the little cable trays. Slack has been pulled back. and termination of the wire will be done on the 7th of May. A modification was done to the signal line of the png gauge wire ultem block, as grounded screw was inserted to allow for strain relief so the end would hopefully quit breaking. See attached pictures for the details.

Wires in TM#2 have been terminated at the top of the module.

50 kV stable with less than 1 spark/h during the weekend by RIB obs.

Today 57 kV reached, but observed sparking on the resistors of the new HV cable. The cable will be removed to take out the resistors, before reinstalling it.

The target hall was locked out, but has now been reopened. This was to avoid sparking to the HV cover.

Anders Mjos wrote:

50 kV stable with less than 1 spark/h during the weekend by RIB obs. Today 57 kV reached, but observed sparking on the resistors of the new HV cable. The cable will be removed to take out the resistors, before reinstalling it. The target hall was locked out, but has now been reopened. This was to avoid sparking to the HV cover.

 EL was brought to 27.5kV.

Conditioning continues today with resistors removed from the HV cable

Tuesday, July 18, 2017, 16:53: BIAS / EZL 50 / 25 kV - no sparks

 Tuesday, July 18, 2017, 16:56: BIAS / EZL 55 / 27.5 kV - one spark

TM3 remained at 55 kV over night. Turbo pumps tripped twice and was restarted and HV recovered by RIB ops. Last recovery brought EZL to 16 kV (not 27.5 kV)

About 25 sparks over 15 h. No sparks for the last 3 h

Wednesday, July 19, 2017, 08:12: EZL to 27.5 kV

Wednesday, July 19, 2017, 08:38: BIAS to 57 kV

Wednesday, July 19, 2017, 08:46: BIAS to 57.5 kV

Wednesday, July 19, 2017, 09:05: BIAS to 59 kV

Wednesday, July 19, 2017, 09:19: BIAS to 60 kV

Wednesday, July 19, 2017, 09:28: EZL to 30 kV

Wednesday, July 19, 2017, 12:25: Heavy sparking. Lowered BIAS to 30 kV

Wednesday, July 19, 2017, 12:37: Increased BIAS again towards 50 kV, but heavy sparking again between 45 and 50 kV. Lowered back to 30 kV

Wednesday, July 19, 2017, 12:40: BIAS at 46 kV

Wednesday, July 19, 2017, 12:42: BIAS at 47 kV

Wednesday, July 19, 2017, 12:44: BIAS at 48 kV

Wednesday, July 19, 2017, 12:48: BIAS at 50 kV

Wednesday, July 19, 2017, 14:50: BIAS at 55 kV after ~2h without sparking at 50 kV

Wednesday, July 19, 2017, 15:12: Sparking. Lowered to 40 kV

Wednesday, July 19, 2017, 16:39: BIAS at 55 kV

Friday, July 21, 2017

Observed top of module inside target hall during HV sparks using crane cameras. No sparks observed, but some faint sound could be heard. Module still sparks at 60 and 55 kV. Have to lower to 40 kV to stop sparking.

Friday, July 21, 2017, 13:25: BIAS / EZL at 50 / 25 kV for without sparking for the last 90 min

Frank and Anders installed lid on TCS and started vacuum system yesterday. To run over the Holidays. Retrieved dose badge from operational storage area. Measured field to be ~ 10 mSv/h at ~9am. Beam went off about 8:30am.

TM4 in conditioning station with no source tray, extraction electrode set to HV bias. Brought up to 30kV over the weekend by ISAC ops with no issues.

BIAS=30kV

EL=15kV

IG1=9.4e-7T

Monday, June 10, 2019, 08:21 : At 32.4kV on bias, EL at 15kV, bias sparked to EL. Every bump of 100V on bias is accompanied by a small vacuum jump and often by a small current increase from ~60uA to 120uA.

* Conditioning station read back and set values are off by 2kV but archive values show this has always been the case. Which to trust? *

Monday, June 10, 2019, 08:54 : Spark while sitting at 38kV on bias, 19kV on EL. Seems to be a spark to EL.  Sitting at 38kV for ~10mins

Monday, June 10, 2019, 09:32 : Sat at 40kV for ~10mins or so, bumping up again.

Monday, June 10, 2019, 09:38 : Spark to EL while sitting at BIAS / EL = 42kV / 20.5kV

Monday, June 10, 2019, 13:57 : Ramped to BIAS / EL = 43 / 21.2. No problems other than what seems to be the usual conditioning station stuff.

 Monday, June 10, 2019, 14:17  : Couple sparks on the way to 48kV, seems to be to the EL.

Monday, June 10, 2019, 14:36 : Up to BIAS/EL = 51/25.5 with no big problems. Will stay here for a couple mins

Ramped down the bias so David could remove the HV cover and lock out the target hall.

Ramped back up to BIAS / EL = 50kV / 26kV quickly with no sparks.

Monday, June 10, 2019, 15:35 : BIAS / EL = 52kV / 26kV

Monday, June 10, 2019, 15:45 : BIAS / EL = 54kV / 28.5kV. It seems that keeping the EL at 1/2 the bias voltage is right on the edge of what is acceptable - the HV seems to be sparking to the EL instead of to ground (either that or the EM interference from the sparks it producing a reaction in the EL...) I will run the EL higher and see if that helps.

Monday, June 10, 2019, 15:57 : Sat at 54kV for > 10mins, will continue up

Monday, June 10, 2019, 16:11 : At BIAS / EL = 55.8kV / 29kV got some sparks, some to EL and some to ground. Back at 55kV.

Monday, June 10, 2019, 16:24 : Sitting at 56kV for a couple mins

Monday, June 10, 2019, 16:37 : Sitting at 56.3kV bias, a spark tripped off the IG1S, which tripped the turbo and shut down all the HV. Back to zero!

Monday, June 10, 2019, 16:59 : TM4 back up to BIAS / EL = 56.1kV / 29.5kV

Monday, June 10, 2019, 17:14 : After 57kV on the bias, things seem to be getting sketchy. The EL voltage and current are a bit jumpy and stepping that voltage up seems to produce a slight spike in the bias current.

Monday, June 10, 2019, 17:31 : At BIAS / EL = 58 / 30.3, looks ok.

Monday, June 10, 2019, 18:11 : Sitting at 59.5kV, could probably push further but will sit here for ~30mins and make sure it is relatively stable. Note 59.5kV set point is really 56.9kV on readout.

Monday, June 10, 2019, 18:18 : some current inconsistencies (not really sparks probably corona discharges...) so went down to 59kV

Monday, June 10, 2019, 18:23 : still getting some sparks at 58kV, going down to 57.5.

Monday, June 10, 2019, 18:37 : went back up to 58, spent 10 mins there but was getting these corona-discharge-type-sparks where the vacuum responds and current is drawn but voltage is maintained. Went down to 57kV, still getting them....

Monday, June 10, 2019, 18:40 : Going down to 56 to see if they stop....

Monday, June 10, 2019, 18:42 : Trying 55 kV now... see attached screenshot for example of sparks

Monday, June 10, 2019, 18:48 : No luck at 55 or 54kV. Going down to BIAS / EL = 50 / 27 for a while to see if this resolves

Monday, June 10, 2019, 19:20 : 30 mins at 50kV, a couple little sparks, but no big deal. Ramping up to 55 and let's see if it is ok.

Monday, June 10, 2019, 19:30 : 55 still not working, going down to 54

Monday, June 10, 2019, 20:16 : Held bias at 54kV for about an hour - dropped it down once to alleviate some sparking. Leaving it at 50kV overnight, ops have instructions to keep an eye on it and shut it off if anything seems strange.