Session aimContinue with Breakdown adjustments and machine conditioning with plasma pulses
Session day2025-04-23Operatorrhenriques
Session IDISTTOK_20250423_1Coordinatorrhenriques

Shot Time Operator Iplasma(kA) n(1018m-3) Duration (ms) Pre/post shot comments
524872025-04-23 18:03:56.025rhenriques1.22.117Repeat with more negative Bv for BD | BD happens earlier but prefill pressure was also lower, not conclusive result
524862025-04-23 17:59:37.173rhenriques1.22.317Repeat with same prefill pressure | back to the same as without premag
524852025-04-23 17:53:35.136rhenriques1.22.417Repeat with different approach for BD Bv waveform | happens later but prefill pressure was much higher than references
524842025-04-23 17:47:36.047rhenriques1.22.117Repeat with Bv tweaks for BD | No improvements
524832025-04-23 17:38:41.837rhenriques1.22.117Try pulse without premag | BD happens later than previous ones
524822025-04-23 17:28:57.887rhenriques1.2217Repeat with changes on Bv for flattop | Worse than before
524812025-04-23 17:20:53.767rhenriques1.2317Repeat with Bv for Ip>0 flattop changes | Still not much better
524802025-04-23 17:15:13.804rhenriques1.2317Straight repeat to get similar premas as in previous pulses | Position drifts off to wrong side
524792025-04-23 17:08:17.202rhenriques1.22.8617Reverting changes for inversion, adjusting Bv during flattop of Ip>0 | premag state was different than previous pulses, harder to interpret
524782025-04-23 16:59:46.131rhenriques1.22.817Further changes to see if it improves, trying also to get 1st inversion to Ip<0 | BD better but flattop worse, inversion to Ip<0 worse
524772025-04-23 16:46:53.414rhenriques1.22.917Correction to Bv for BD and changes on Bv for early phase of cycle | Much better 1st cycle
524762025-04-23 16:37:41.189rhenriques1.22.117Repeat with changes on Bv for BD | changes affectec Ip ramp up, no clear changes during flattop
524752025-04-23 16:27:40.983rhenriques1.22.517Repeat with further adjustments on Bv Ip>0 | Better
524742025-04-23 16:22:29.315rhenriques1.22.817Reverting Bv for Ip<0 changes, and changing Bv for Ip>0 with -20 A to get at least the 1st cycle reasonably centered | begining seems worse but ending seems slightly better
524732025-04-23 16:16:18.238rhenriques1.2317Repeat with Bv for Ip<0 with -10 A | Negative cycles are shorter
524722025-04-23 16:08:00.496rhenriques1.23.3717Repeat with further changes on Bv for Ip<0 (-10A) and Bv for Ip>0 (+10A) | Negative cycles are longer, no changes in position
524712025-04-23 15:59:20.895rhenriques1.22.817Repeat changing Bv (-10 A in all waveform points) | negative cycles are slightly longer
524702025-04-23 15:50:17.759rhenriques1.22.817Repeat trying to improve negative cycles first, Bh for flattop more negative | No clear changes observed
524692025-04-23 12:13:11.018rhenriques1.2017Repeat with Bv change into opposite direction | Still mostly the same, it needs a new equilibrium as previous one does not seem to be valid anymore
524682025-04-23 12:07:52.427rhenriques1.2017Repeat with adjusted primary current to get a more constant plasma current and increased Bv in inversion to Ip>0 | Bv change seems to have made it worse
524672025-04-23 12:00:24.986rhenriques1.3017Repeat with changes for improved BD | Much better BD, but the rest is mostly the same
524662025-04-23 11:49:47.894rhenriques1.2017Plasma for cleaning/conditioning repeat 52251 with limited Primary current and 20 cycles only | 1st cycle OK, then only negative short cycles
524652025-04-23 11:26:10.761rhenriques4.3026Repeat with Bv at -134.77 A | Mostly the same as in previous
524642025-04-23 11:20:45.73rhenriques4.3026Repeat with Bv at -137.7 A | prefill 1.05e-5 mBar, BD slightly earlier than previous
524632025-04-23 11:13:48.972rhenriques4.3026Going back to 52455 recipe and perform small tweaks, Bv for BD with -140.63 | prefill during pulse at MC was 1.06e-5 mBar
524622025-04-23 11:04:30.332rhenriques4.3026Repeat with Bv for BD changed to -100 A | BD happens significantly later
524612025-04-23 10:59:54.955rhenriques4.2026Repeat with Bv for BD changed to -125 A | BD happens earlier than previous but later than 52459
524602025-04-23 10:55:28.773rhenriques4.1026Repeat aiming again at 9.5e-5 mBar at MC before pulse and changes on Bv for BD to improve | BD starts later
524592025-04-23 10:49:15.347rhenriques4.3026Repeat with prefill at 9.5e-5 mBar at MC before pulse to prevent HXRs | prefill befor pulse was 9.1e-5 mBar and measured one was 9.75 mBar, there is still tiny bit of HXR
524582025-04-23 10:44:07.847rhenriques4.3026Repeat with a bit less prefill pressure | Prefill on screen before pulse 8.7e-5 mBar at MC, measured during pulse 9.24e-5 mBar at MC
524572025-04-23 10:39:08.425rhenriques4.35026Repeat | No HXR observed, prefill measured at 9.7e-5 mBar while in display before pulse was 9.2e-5 mBar
524562025-04-23 10:29:35.74rhenriques0026Repeat with higher prefill pressure to prevent runaway electrons (HXRs) | Controller failed, no plasma
524552025-04-23 09:25:21.679rhenriques4.7026Repeat aiming same prefill as in 52448 (previous was a bit high) | Maximum current still lower than reference pulse but overall behaviour is similar
524542025-04-23 09:15:12.141rhenriques4026Repeat 52448 to assess conditioning changes (using prefill pressure as in reference ~6.5e-5 mBar) | Density signal not working, some plasma observed before BD, premag did not reach requested current
524532025-04-23 09:02:30.851rhenriques000Dryrun (file: dryrun_standard_2025_04_04_52149.cfg) no TF | PF currents OK