Pictures of the water blocks before polishing can be found on docushare, collection 24400

Polishing of the water block sealing surfaces has commenced. First attempt was on block B with low nap brown polishing pad (the least aggressive pad prepared) and isopropyl for 30 seconds. This cleaned a little but did not remove the "ring" which I believe is water scale. I will step up to 2000 grit wet sand paper and iso next.

After trials with 2000 grid wet paper I have moved up to "red" scotch brite. This seems to have worked the best so far although it took two minutes to remove the ring that the other materials could not remove (see picture).

I have moved to next circuit. Currently at 3 minutes and 30 seconds with scotch brite but significant ring remains.

Stage 1 polishing (water scale and at least 99% of visual indium removed) has been achieved on all 2 seal water blocks that will be used (Ground electrode has not been polished). Process required 3-4 3minute cycles of the tool using scotch brite pads with the tool running at approximately 75 psi.

Stage 1 polish has been achieved on all single seal water blocks using the single pad tool run at 75 psi, 2 3 minute cycles per block using red scotch brite.

Phase 2 (intermediate) and Phase 3 (Final) polishing is complete on all water blocks on TM2 (minus ground electrode circuit which has only had a cursory cleaning). Phase 2 with 2000 grit wet sand paper and isopropynol for 1 minute with tool at 75 psi, Phase 3 with Veltex polishing cloth for 1 minute with tool at 75 psi.

 TM#2 has been moved from the south hot cell to the conditioning station.

New seals with a blank off cap are installed on TM2 window line water block.   The seals are checked at TCS with 70 psi helium for 5 minutes with LD at 0.0xE-9atm/cc.sec. No response on LD during test. Seals are good.

 TM#2 has been moved from the conditioning station to the south hot cell.

This morning new water block fasteners and gas line capture nut fasteners were inserted into the hot cell. Window waterline blank off was removed from TM2, surfaces inspected and given a polish with Veltex (30 seconds, 70 psi) as there was a small bit of c seal residue. Transfer try with new source tray has been latched to the module.

Link to previous target information: https://elog.triumf.ca/TIS/RH-ISAC/1039

Monday, March 25, 2019, 10:00: Target electrical checks (See Attachment 1)

Tested for TM2 

 TM#2 with a new source tray and the dummy target has been moved from the south hot cell to the conditioning station.

 Electrical Check of TM#2 with the dummy target attached.

 The four electrical check done on TM#2 during the source tray change.

Helium pressure test on TM2 all water circuits is done. 70 psi helium , 10 minutes test time. Leak detector :base leak rate 0.0XE-9 atm.cc/sec, base pressure 0.0Xe-4torr. No any response on LD during the test. All TM2 water circuit are leak free.

David Wang wrote:

Helium pressure test on TM2 all water circuits is done. 70 psi helium , 10 minutes test time. Leak detector :base leak rate 0.0XE-9 atm.cc/sec, base pressure 0.0Xe-4torr. No any response on LD during the test. All TM2 water circuit are leak free.

 Thursday, March 28, 2019, 12:40: Found valve to expansion tank TCS:TK2 to be closed. Opened valve. This allow air to escape out of the system and the water system is running as expected again

Friday, March 29, 2019, 11:15: Changed EE to conditioning mode

Friday, March 29, 2019, 11:35: BIAS / EZL 20 / 10 kV

Friday, March 29, 2019, 13:47: BIAS / EZL: 25 / 12.5 kV

Friday, March 29, 2019, 16:09: BIAS / EZL: 30  / 15 kV

Friday, March 29, 2019, 17:23: No sparks for >60 min

Friday, March 29, 2019, 17:26: BIAS / EZL off

Monday, April 01, 2019, 08:13: BIAS / EZL: 30  / 15 kV

Monday, April 01, 2019, 08:33 BIAS / EZL: 35  / 17.5 kV

Monday, April 01, 2019, 09:00: Sparking at about 37.5 kV BIAS. Lowered below 20 kV to stop. Now sparking at around 20 kV

Monday, April 01, 2019, 10:00: BIAS/EZL 22 / 20 kV. Occasional sparking on BIAS as voltage is increased.

Monday, April 01, 2019, 10:05: Change of strategy. Will heat target to bake out the vacuum before continuing with HV conditioning.

Monday, April 01, 2019, 10:43:

BIAS / EZL / EE: 15 / 7.5 / 1.5 kV
COIL / ANODE: 10 A / 200 V
Ramping TGHT / TBHT at 1 A/min. Good/bad vacuum (IG2): 1E-6 / 2E-6 Torr

Monday, April 01, 2019, 19:16: TGHT / TBHT: 500 / 270 A. Vacuum increasing. IG1/2 1.2E-7 / 1.4E-6 Torr

Monday, April 08, 2019, 09:28: BIAS / EZL: 20 / 10 kV (some periods of multiple sparks)

Monday, April 08, 2019, 10:28: BIAS / EZL: 30 / 15 kV (some periods of multiple sparks)

Monday, April 08, 2019, 11:24: 3 sparks for the last 60 min

Monday, April 08, 2019, 14:43: BIAS / EZ: 40 / 20 kV (after two periods of sparking around 39 kV requiring voltage to be reduced below 30 kV to recover)

Monday, April 08, 2019, 15:57: Two sparks in 70 min

Tuesday, April 09, 2019, 12:40: BIAS / EZL 40 / 20 kV with >90 min without sparking

Tuesday, April 09, 2019, 16:00: BIAS / EZL 48 / 24 kV

Tuesday, April 09, 2019, 16:07: Sparking tripped TPs and IG1S, then power supplies.

Tuesday, April 16, 2019, 16:41: BIAS / EZL 50 / 25 kV for 1 hour without sparking.

Wednesday, April 17, 2019, 15:23 : Continued without problems to 50 kV earlier, but sparks tripped off vacuum just above 50kV. Continue later.

Ta #58 has been installed onto TM2. All new silver plated high current fasteners. All torqued to 130 in lbs.

 Results of the electrical check of TM#2 without target and with the new Ta#58 target.

 TM#2 with Ta#58 has been moved from the south hot cell to the east target station.

ITE water signal interlock check is done. Everything is good. Coil 2   circuit no longer used in ITE . PQRU are looped as one circuit fro coil 1 circuit on Module since now.