 Friday, June 07, 2019, 08:56, Travis Cave, Conditioning Station, Standard Operation, TM4, no target, Module move
|
| TM#4 has been moved from the south hot cell to the conditioning station. |
|
Friday, June 07, 2019, 13:11, David Wang, Conditioning Station, Development, TM4, , TCS and TM4.
|
| TM4 has been connected at TCS for HV test. TCS water system and vacuum pumps are switched on. |
|
Monday, June 10, 2019, 08:26, Carla Babcock, Conditioning Station, Maintenance, TM4, No target, Ramping voltage on TM4 w/o source tray
|
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 |
|
Monday, June 10, 2019, 16:22, Carla Babcock, Conditioning Station, Maintenance, TM4, No target, Ramping V on TM4, no HV cover in TH
|
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, 18:12, Carla Babcock, Conditioning Station, Maintenance, TM4, No target, Attempt to push bias > 56kV 
|
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. |
|
Wednesday, June 12, 2019, 08:56, Carla Babcock, Conditioning Station, Maintenance, TM4, No target, More TM4 conditioning without source tray
|
The conditioning station was ramped down overnight and David ramped it back up this morning. Currently trying to get it to sit stable at something higher
than 55kV.
|
|
Thursday, June 13, 2019, 09:09, Travis Cave, South Hot-Cell, Standard Operation, TM4, no target and no source tray, Module move
|
| TM#4 has been moved from the conditioning station to the south hot cell. The module has no source tray. |
|
Thursday, June 13, 2019, 10:55, David Wang, Conditioning Station, Repair, TM4, , TM4 HV test at TCS without source tray.
|
I brought up TCS bias to 57.5 KV on TM4 without source tray at TCS. It was kept at this level about 1.0 hours. Some intermediate sparks. No spark trip
on devices. 57.5KV is very close to the HV up limit of this module. |
|
Friday, June 21, 2019, 07:16, David Wang, South Hot-Cell, Development, TM4, , TM4 new source tray leak check at SHC.
|
New source tray was installed on TM4 yesterday. LD was used to pump down all water lines. Tube heater +D circuit has a big leak around water block
area. At base LR5.5 XE-5 atm.cc/sec, base pressure 170 mtorr, When Chad moved this helium probe close to water block area, The leak rate on
LD went to maximum level right away. When the probe was moved out of water block area, the LR went back to base level. The test repeated again with same |
|
Monday, July 08, 2019, 14:56, Carla Babcock, Conditioning Station, Repair, TM4, Dummy HP SIS target, First TM4 conditioning with new source tray
|
Ramping up TM4 with new source tray in. Current condition: new source tray but no water running in lines B, D or window. Multipin on the source tray
grounded but no lines running into the service tray. Vacuum at 1e-6T.
Small sparks at each BIAS voltage increase starting at 30kV. First real spark around 38kV. |
|
Tuesday, July 09, 2019, 09:15, Carla Babcock, Conditioning Station, Repair, TM4, Dummy HP SIS target, Conditioning TM4 w/ new ST up to 45kV
|
Left TM4 at 40kV overnight with no previous heating. There was only one real spark which turned off TP2 but ops turned it back on. Ramping up again.
Tuesday, July 09, 2019, 09:13 : At 45kV the module is sparking on the top pretty regularly. Turned down and David will remove cover and lock out
target hall. |
|
Wednesday, July 10, 2019, 11:59, Carla Babcock, Conditioning Station, Repair, TM4, Dummy HP SIS target, Conditioning TM4 w/ new ST up to 50kV
|
David raised the bias to 49.5kV. Module is still sparking mainly on top. Humidity is super high.
Wednesday, July 10, 2019, 09:50 : sitting at 49.7kV for a coupe mins, big spark in vacuum took everything down.
Wednesday, July 10, 2019, 10:16 : Bias at 50kV drawing 0.1mA but looking pretty jumpy. Left it here for ~5 mins then had to turn down bias for |
|
Monday, July 15, 2019, 13:29, David Wang, Conditioning Station, Development, TM4, , Vacuum surge when TM4 B line iwas supplied with water.
|
Yesterday, TM4 B line was supplied with water at TCS for testing. TCS: IG1 and IG2 had big response on it. See attachment. The water was disconnected
right away, and line was purged. Vacuum recovered after overnight pump. |
|
Tuesday, July 16, 2019, 08:44, Travis Cave, Conditioning Station, Standard Operation, TM4, no target, Module move
|
TM4 has been moved from the conditioning station to the south west silo. Module was placed with the turbo pump facing south which puts the windows
facing north and south and the shutter facing west. |
|
Monday, July 22, 2019, 14:51, Adam Newsome, South Hot-Cell, Standard Operation, TM4, No Target, TM4 Move
|
| TM4 has been moved from the South West silo to the South Hot Cell. New source tray, no target. |
|
Friday, July 26, 2019, 11:28, David Wang, South Hot-Cell, Standard Operation, TM4, , TM4 move from SHC to TCS.
|
Tm4 has been moved from SHc to TCS without containment box. It is a new source tray on TM4. A layer of plastic sheet was put on TH floor on module
pass route during the move. |
|
Friday, July 26, 2019, 11:41, David Wang, South Hot-Cell, Standard Operation, TM4, , TM4 with spare target electrical check and leak check.
|
Electrical check on TM4 with spare test target. PQ is still shorted to RU. But, The short between 60KV bias and PQRU which we found last time is gone.
Target to PQRU at 250V mega measurement: 22.08 M. All conductivity between ABCD are about 5.0 m ohm which are good. All other ohm meter and Mega measurements
are OL. Helium spray leak check on HS target VCR fittings is passed. Two blank offs are installed on source tray window cool lines. They passed leak |
|
Monday, July 29, 2019, 16:17, Carla Babcock, Conditioning Station, Repair, TM4, Dummy LP SIS, New leak on EE water line while testing new In seals
|
Original Problem:
Leaks on the B and D copper blocks, probably due to corrosion between the blocks and the inserts. Final solution, after many tries, was to make
an indium sheet the size of the copper blocks and use that to seal the entire surface. |
|
Wednesday, July 31, 2019, 08:57, Adam Newsome, South Hot-Cell, Standard Operation, TM4, No Target, TM4 Move
|
| TM4 has been moved from the Conditioning Station to the South Hot Cell. No target. |
|
Tuesday, August 06, 2019, 01:13, Carla Babcock, Conditioning Station, Repair, TM4, Dummy HP SIS target, Checks on EE line leak fix and window line leak (not fixed)
|
TM4 has developed 4 leaks so far:
Line B - seems to be solved with an indium gasket (some testing already done)
Line D - seems to be solved with an indium
gasket (some testing already done)
EE - indium gasket installed, preliminary tests are good
Window cooling line - David found |
|