Thursday, August 29, 2019, 14:47 : Changing back to the nominal wiring
Thursday, August 29, 2019, 17:01: TIS changed to Ferran's heat shield.
Thursday, August 29, 2019, 17:02: 9-pin FT redone.
Friday, August 30, 2019, 00:28: Turbos on
Friday, August 30, 2019, 00:36: IG1 on.
Tuesday, September 03, 2019, 09:09: RGA on. Vacuum stable @ 2.1e-6T
Tuesday, September 03, 2019, 15:00. Wire redone. Crosschecked by Arthur Leung.
Tuesday, September 03, 2019, 15:16: Turbos tripped. TSG:CG1A above 50 mTorr
Wednesday, September 04, 2019, 09:34 : Turbos on. After the bakeout it will be better to have TSG:CG1A checked.
Wednesday, September 04, 2019, 09:43: IG1 on
Wednesday, September 04, 2019, 09:45: RGA on
Wednesday, September 04, 2019, 12:42 : Waterlines opened. No response on RGA. Vaccum stable @ 3.1e-6 T
Wednesday, September 04, 2019, 14:53 : Auto-ramping TGHT / TBHT to 100/ 100 A @ 4 A/min.
Wednesday, September 04, 2019, 16:04: Auto-ramping TGHT / TBHT to 250/ 250 A @ 4 A/min.
Wednesday, September 04, 2019, 17:33: Final auto-ramping of the day TGHT / TBHT to 290/ 290 A @ 4 A/min. Vacuum stable@2.7e-7T
NB: Ferran's HS doesn't have an extraction electrode. Since the purpose of the heating is to "baked-out" the system, this is actually great as the shine will go downstream the beamline.
Thursday, September 05, 2019, 08:05: Auto-ramping TGHT to 580 A @ 2 A/min. Vacuum stable @2.97e-7T
Thursday, September 05, 2019, 09:30: TGHT PS is voltage-limited @440A and 5.2V. Stopping auto-ramping to increase the voltage limit to 7.7 (from previous screenshots).
Thursday, September 05, 2019, 09:31: Auto-ramping TGHT to 580A @ 2A/min.
Wednesday, May 15, 2019, 08:58: Optics/ HV on.
Monday, September 09, 2019, 16:05: Optics set. IV4 open.
Monday, September 09, 2019, 17:26: BIAS / EE / EZL @ 30 / -1.5 / 13 kV.
Twenty minutes w/o sparks
Monday, September 09, 2019, 17:52 Optics/HV off
Tuesday, September 10, 2019, 10:05: Auto-cooling 4A/min
Tuesday, September 10, 2019, 13:27: IV4 closed.
Tuesday, September 10, 2019, 13:27: IG1 off. RGA off
Tuesday, September 10, 2019, 13:28: Turbos off
Wednesday, September 11, 2019, 09:21: Venting.
Wednesday, September 11, 2019, 09:24 HS waterline purged
Wednesday, September 11, 2019, 10:54: Cleaned the interior of chamber with methanol and Kim-wipes. Some dust and debris were removed with
Wednesday, September 11, 2019, 10:54 : Adding EE to the Assy.
Wednesday, September 11, 2019, 11:03: Roughing.
Wednesday, September 11, 2019, 11:35: Turbos on
Wednesday, September 11, 2019, 11:47: Turbos at speed.
Wednesday, September 11, 2019, 11:48: IG1 on
Wednesday, September 11, 2019, 11:54: RGA on
Friday, September 13, 2019, 08:56: RGA off. IG1 off.
Friday, September 13, 2019, 08:56: Turbos off
Monday, September 16, 2019, 08:11: Venting
Monday, September 16, 2019, 09:58: Assembly removed. |
Friday. July 26th 2019
A new electrical configuration of the test stand was decided and installed. The TGHT and TBHT were parallelized in order to deliver up to 600 + 600 Amperes to the p2n target.
Connections:
TGHT+: D
TGHT-: C
TBHT+: one cable to E and one cable to G (both going down to the coil terminal blocks, which are connected to the target terminal blocks through a copper short.
TBHT-: both cables to F. One 4/0 cable was run from F to H to achieve the same configuration as for TBHT+. The H terminal is connected to I (HV ground, conencted to the target copper heat shield) through a braided cable
One braided cable was connected from C to H so the target line should have the same potential as the TBHT/coil lines.
Saturday, July 27th
The current was ramped from the TBHT and TGHT in parallel up to 400+400=800A.
Sunday, July 28th
One leg of the target is glowing a bit, while the other doesn't. This suggests the current path is not straightforward as we planned.
Temperature measurements of the cables on top of the test stand were performed using a mini IR thermometer (FLUKE, borrowed from Arthur).
Temperature of the braided cable from C to H = ~50 °C --> This points to an imbalance of current between the two lines (TGHT and COIL lines). This might be alright.
Temperature of the braided cable from H to I = ~130 °C. This likely points to a short circuit between the target and the copper heat shield.
Monday, July 29th
In order to understand if the target is broken or touching the heat shield, we opened up the service cap.
- The braided cable from H to I was removed
- The braided cable from H to Q was disconnected
These two modifications were made so that the current cannot come back from the heat shield, but has to go through the target lines.
The 4/0 cables from the PS to the feedthroughs were removed so that we could confirm there is a short between C (target) and I(HV ground/heat shield). The 4/0 were than put back on the feedthrough connections.
Under advice of Dan Louie and Arthur, we did not change any configuration of the power supplies. We know that the current would go through the controls loop, but the impedance of this electronics should be high enough to sustain the current load.
At 3pm, the ramping was still increasing the current on the target, but one leg (the right one) was still glowing. By this time, the total current in the target assembly is ~500 amperes, so there should be no signs of any glowing happening. Probably there's something wrong with the target itself. We're opening up to check the status of the target.
Tuesday, July 30, 2019, 10:00: Venting.
Tuesday, July 30, 2019, 10:03: Purging heat shield water loop.
Tuesday, July 30, 2019, 11:46: P2N removed
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