Saturday, April 27, 2024, 09:35 :
Started ramping up HV, EE and EL together. First small spark at 20.5kV on bias, no reaction in other devices.
Note both BIAS and EL are off in their readbacks. See table below
| BIAS set pt |
BIAS readback |
BIAS actual |
EL set pt |
EL readback |
EL actual |
| 24 |
24.4 |
24.5 |
14 |
13.42 |
14 |
| 30 |
30.52 |
31 |
16 |
15.34 |
16 |
| 35 |
35.6 |
36 |
19 |
18.2 |
19 |
| 40 |
40.65 |
41.5 |
20 |
19.16 |
20 |
| 45 |
45.8 |
46.5 |
22 |
21 |
22 |
| 50 |
50.8 |
51.5 |
25 |
23.9 |
25 |
| 55 |
55.9 |
57 |
27 |
25.84 |
27 |
| 60 |
60.95 |
62.5 |
30 |
28.7 |
|
| 62 |
63 |
64.5 |
|
|
|
| 66 |
67.1 |
68.5 |
|
|
|
| 67 |
68 |
69.5 |
|
|
|
| 69 |
70.1 |
71.5 |
|
|
|
| 70 |
71.1 |
?? |
|
|
|
| 70.5 |
71.7 |
73 |
|
|
|
Saturday, April 27, 2024, 10:23 :
Spark on HV only at 25.5, couple sparks from here to 33, then at 33 starts real conditioning.
EL is reacting to some of the sparks, not sure if this is just electrical noise or not.
Saturday, April 27, 2024, 18:14 :
lots of trips above 60kV on the set pt. tripping off turbos and gauges. IG2 needed the controller reset.
RESULT: Got to 64.5 (actual) 62 (set point) with quite a bit of sparking over 60kV. Will go the rest of the way to 73 in the next days. Data dumped as isac/data/TM3_HVtests_Apr272024.dat
Sunday, April 28, 2024, 11:23 :
Ramped back up to 60kV reasonably easily, couple sparks and turbo trips.
Went up to 64kV (set point) with a lot of difficulty. Data dumped as isac/data/TM3_HVtests_Apr282024.dat
Monday, April 29, 2024, 14:58 :
Ramped up to set pt 62 easily, went down to 500V then 100V steps after that.
Went to set pt of 67 and left it there for ~40mins. Not perfectly stable but not too bad.
Tuesday, April 30, 2024, 17:12 :
After rebooting the TCS PLC to fix all the non-responsive devices, everything is working fine again.
Ramped easily to 60kV in 1kV steps.
Still got to 67 without too much trouble. Behaving pretty well...
At 70.2 (set pt, 71.3 readback) the water and vacuum gauge both tripped off and cannot be restarted. I am not sure what the real power supply reading is here but in the past it has been 70.5 set pt = 73 real value, which is as high as the power supply goes.
Stopping here since I'm not sure the water is circulating... the off pump says it is and the on pump says its not... left it at 70.2 for 40mins, still sparking going on (20:28 to 21:10)
Data dumped as isac/data/TM3_HVtests_Apr302024.dat
Sunday, May 05, 2024, 10:50 :
Containment box and target installed.
HV conditioning starting at 47kV.
Spark at 58kV knocked out IG1. Continuing with IG2 and IG1S.
Went up to set point of 63, readback 64. Will continue on Monday.
Data dumped: isac/data/TM3_HVtests_May52024.dat
Monday, May 06, 2024, 09:37 :
Ramping system back up.
First sparks at 50kv while raising the EL voltage (not sure if they are related).
AS: Voltage quickly up to 63 kV from 49 kV. Very smooth, no sparks or instabilities. Ramped at around 250 V steps every 10-20 seconds. First signs of instability at ~62.75 kV and definitely at 63 kV. I guess this is where it was conditioned to last. Let sit at 63 kV for a while while doing something else. It sparked once and turned off a turbo after half an hour. Starting ramping again.
AS: Spark at 65.75 kV killed IG1. Carla manually reset at 69 kV. Still working. A spark at 70.25 kV took out IG1 again.
AS: Maximum voltage reached at about 16:45. Setpoint 70.5 kV, readback 71.7 kV, PS itself ~73 kV. Carla reset IG1.
AS: 18:30, spent about 1.5 hours cumulatively at this maximum voltage. During this time it sparked about 15 times. Not long enough to tell if the spark frequency is decreasing. In the middle of this, Carla did something accidentally and caused the voltage to drop a bunch, so I manually set it to 0 V. She then reset TP1S, which was not staying on. Also, the EE and EL stayed at their respective voltages during this downtime (2 kV and 28.7 kV). I ramped the main BIAS voltage back up to the maximum voltage within 5 minutes and it was smooth all the way but sparked again at the maximum voltage. It seems conditioned up to or near the max voltage. Ramped down and turned off BIAS, EL, and EE.
AS: Dumped data to isac/data/TM3_HVtests_May62024_Alexander.dat
Tuesday, May 07, 2024, 10:02 :
Tested the EE - ramped up easily to 7kV, but then had issues maintaining the voltage. No vacuum response. Ramped down since we never use it that high anyway, though cable should be good for 10kV. More investigations later.
EDIT 2024-11-25, Alexander Shkuratoff:
Summary of StripTool data taken during this round of tests:
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