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| VTPC-1 | Gap TPC | VTPC-2 | FTPC 1 | MTPC-L | MTPC-R | FTPC 2 | FTPC 3 | | | |
Tue, 28.10.2025 20:11:26 | 500V/13kV | 500V/8.16kV | 500V/13kV | 500V/17.3kV | 500V/19kV | 500V/19kV | 500V/17.3kV | 500V/17.3kV | Full drift voltage and potential strips ON in big TPCs, 500V on sense wires, Gating Grid turned on. | (BL) | |
Wed, 29.10.2025 17:13:30 | 600V/13kV | 600V/8.16kV | 600V/13kV | 600V/17.3kV | 600V/19kV | 600V/19kV | 600V/17.3kV | 600V/17.3kV | +100V on sense wires, now at 600V | (BL) | |
Fri, 31.10.2025 10:08:18 | 700V/13kV | 700V/8.16kV | 700V/13kV | 700V/17.3kV | 700V/19kV | 700V/19kV | 700V/17.3kV | 700V/17.3kV | +100V on sense wires, now at 700V | (BL) | |
Fri, 31.10.2025 10:58:55 | 800V/13kV | 800V/8.16kV | 800V/13kV | 800V/17.3kV | 800V/19kV | 800V/19kV | 800V/17.3kV | 800V/17.3kV | +100V on sense wires, now at 800V | (BL) | |
Fri, 31.10.2025 11:46:14 | 900V/13kV | 900V/8.16kV | 890V/13kV | 900V/17.3kV | 900V(SR)/840V(HR)/19kV | 900V(SR)/840V(HR)/19kV | 900V/17.3kV | 900V/17.3kV | up to +100V on sense wires, VTPC2 and MTPCs now at 200V below nominal | (BL) | |
Fri, 31.10.2025 12:21:13 | 1000V/13kV | 980V/8.16kV | 890V/13kV | 980V/17.3kV | 900V(SR)/840V(HR)/19kV | 900V(SR)/840V(HR)/19kV | 950V/17.3kV | 950V/17.3kV | up to +100V on sense wires, All TPCs except VTPC1 sectors 1,4 now at 200V below nominal | (BL) | |
Fri, 31.10.2025 13:11:55 | 1075V(S1,4)/1050V(S2,3,5,6)/13kV | 1030V/8.16kV | 940V/13kV | 1030V/17.3kV | 950V(SR)/890V(HR)/19kV | 950V(SR)/890V(HR)/19kV | 1000V/17.3kV | 1000V/17.3kV | +50V on sense wires (+75 for VTPC1 S1,4) to begin gradual raise to nominal voltages. | (BL) | |
Fri, 31.10.2025 13:33:14 | 1150V(S1,4)/1100V(S2,3,5,6)/13kV | 1080V/8.16kV | 990V/13kV | 1080V/17.3kV | 1000V(SR)/940V(HR)/19kV | 1000V(SR)/940V(HR)/19kV | 1050V/17.3kV | 1050V/17.3kV | +50V on sense wires (+75 for VTPC1 S1,4) now all chambers at 100V below nominal voltages. | (BL) | |
Fri, 31.10.2025 14:17:46 | 1250V(S1,4)/1200V(S2,3,5,6)/13kV | 1180V/8.16kV | 1090V/13kV | 1180V/17.3kV | 1100V(SR)/1040V(HR)/19kV | 1100V(SR)/1040V(HR)/19kV | 1150V/17.3kV | 1150V/17.3kV | All TPCs at nominal voltages. | (BL) | |
XXX, xx.11.2025 xx:xx:xx | 1250V(S1,4)/1200V(S2,3,5,6)/13kV | 1150V/8.16kV | 1090V/13kV | 1150V/17.3kV | 1100V(SR)/1040V(HR)/19kV | 1100V(SR)/1040V(HR)/19kV | 1150V/17.3kV | 1150V/17.3kV | GapTPC and FTPC1 safety max voltage was set to 1150 in GECO and I didn't notice, so despite setting to 1180V we were only operating at 1150V. Since we've been running at 1150V for a few days on this voltage and everything looked fine, we decided to continue at this setting. Timestamps are not present for this entry because I forgot to log it at the time, but it was a couple days after initial raising. | (BL) | |
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Sat, 1.11.2025 14:07:31 Lowered VTPC1 by 200V for safety to allow for examining Gating Grid modules
Sat, 1.11.2025 14:36:24 Began re-raising VTPC1 voltages back to nominal.
Sat, 1.11.2025 15:29:20 VTPC1 back to nominal
Wed, 5.11.2025 18:46:20 Lowered VTPCs, GTPC and FTPCs by 200V for beam tuning
Wed, 12.11.2025 17:58:41 TPC HV for VTPC1 sectors 3 and 6 were turned off to check sector 3 noisy module during MD. A loose grounding cable was found (fixed), and from 17:00-17:45 the HV for those sectors was brought back up.
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| VTPC-1 | VTPC-2 | MTPC-L | MTPC-R | | | |
Mon, 24.11.2025 08:19:32 | 990V(S1,4)/960V/13kV | 870V/13kV | 900V(SR)/820V(HR)/19kV | 900V(SR)/820V(HR)/19kV | New table without beamline TPCs (HV off) for Pb run. Voltages stepped down to 200V below ion run levels for beam tuning | (BL) | |
Wed, 26.11.2025 16:08:23 | 500V/13kV | 500V/13kV | 500V(HR)/19kV | 500V(HR)/19kV | Power cut to EHN1 building this morning. Beginning re-raise of TPC HV to nominal-200V | (BL) | |
Wed, 26.11.2025 17:10:20 | 990V(S1,4)/960V/13kV | 870V/13kV | 900V(SR)/820V(HR)/19kV | 900V(SR)/820V(HR)/19kV | TPC HV back to 200V below nominal | (BL) | |
Sun, 30.11.2025 13:13:32 | 1040V(S1,4)/1010V/13kV | 920V/13kV | 950V(SR)/870V(HR)/19kV | 950V(SR)/870V(HR)/19kV | Beginning raise to nominal, with +50V step. | (BL) | |
Sun, 30.11.2025 13:24:07 | 1090V(S1,4)/1060V/13kV | 970V/13kV | 1000V(SR)/920V(HR)/19kV | 1000V(SR)/920V(HR)/19kV | +50V | (BL) | |
Sun, 30.11.2025 19:23:58 | 1120V(S1,4)/1090V/13kV | 1000V/13kV | 1030V(SR)/950V(HR)/19kV | 1030V(SR)/950V(HR)/19kV | +30V | (BL) | |
Sun, 30.11.2025 19:47:44 | 1150V(S1,4)/1120V/13kV | 1030V/13kV | 1060V(SR)/980V(HR)/19kV | 1060V(SR)/980V(HR)/19kV | +30V | (BL) | |
Sun, 30.11.2025 19:56:30 | 1170V(S1,4)/1140V/13kV | 1050V/13kV | 1080V(SR)/1000V(HR)/19kV | 1080V(SR)/1000V(HR)/19kV | +20V | (BL) | |
Sun, 30.11.2025 20:05:48 | 1190V(S1,4)/1160V/13kV | 1070V/13kV | 1100V(SR)/1020V(HR)/19kV | 1100V(SR)/1020V(HR)/19kV | +20V. Now at nominal. | (BL) | |
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Wed, 26.11.2025 21:38:04 We received two insanely high-intensity blasts of nowhere (supposed to have no beam). Despite being 200V below nominal, VTPC1 recorded almost 4uA. Sasha lowered VTPC1 HV by 300V just in case it happened again.
Fri, 28.11.2025 21:17:05 Begin re-raising VTPC1 back to 200V below nominal.
Sun, 30.11.2025 21:38:06 MTPCL sector 25 started running a current (4-6uA) after S1 intensity scan during field-off preparation. Dropped sector voltage by 300V to reduce current, slowly raising back up. S1 intensity at the time was approximately 200k.
Sun, 30.11.2025 23:17:36 MTPCR sector 5 started running a high current, but the trip settings (3uA/2.5s) automatically cut off power to the sector. S1 ~100k, no clear reason this.
GRC Settings for Pb+Pb are here, nominal is 1540V. For p+p300, see Andras' prior entry in experts logbook
Sat, 29.11.2025 12:12:27 GRC voltage ramped up to 500V
Sat, 29.11.2025 12:27:00 GRC 700V
Sat, 29.11.2025 12:42:07 GRC 800V
Sat, 29.11.2025 12:54:13 GRC 900V
Sat, 29.11.2025 13:05:13 GRC 1000V
Sat, 29.11.2025 13:15:44 GRC 1100V
Sat, 29.11.2025 13:26:38 GRC 1200V
Sat, 29.11.2025 13:38:24 GRC 1300V
Sat, 29.11.2025 13:50:16 GRC 1340V. Now at nominal-200V, waiting to raise with rest of TPCs
Sun, 30.11.2025 13:14:28 GRC 1390V
Sun, 30.11.2025 13:23:58 GRC 1440V
Sun, 30.11.2025 19:23:58 GRC 1470V
Sun, 30.11.2025 19:56:39 GRC 1500V
Sun, 30.11.2025 20:05:48 GRC 1520V
Sun, 30.11.2025 20:15:40 GRC 1540V. Now at nominal.
Sat, 6.12.2025 23:38:03 At request of Andras, we are raising GRC HV from 1540V to 1580V. I am doing it in 2 steps, from 1540 to 1560, then 10 minutes later to 1580.
Mon, 8.12.2025 07:05:35 End of run. Ramping down all TPC HV |