From aeadefa648eef060a1d9adbf792e6bd9b1ff0178 Mon Sep 17 00:00:00 2001 From: armborst_f Date: Mon, 23 Jun 2025 17:28:18 +0200 Subject: [PATCH] after bdm --- docs/bdm/minutes/index.md | 71 +++++++++++++++++++++++++++------------ docs/schedule.md | 5 +-- 2 files changed, 53 insertions(+), 23 deletions(-) diff --git a/docs/bdm/minutes/index.md b/docs/bdm/minutes/index.md index b61c0a6..879fbc4 100644 --- a/docs/bdm/minutes/index.md +++ b/docs/bdm/minutes/index.md @@ -207,7 +207,7 @@ Minutes written by {{Felix}} ## 23/06/2025 **Participants:** -{{RomainG}}, {{Lukas}}, {{Masamitsu}}, {{Boris}}, {{Jonas}}, {{Michael}}, {{Cigdem}}, {{Simona}}, {{Martin}}, {{Jesus}}, {{Felix}} +{{Hans}}, {{RomainG}}, {{Lukas}}, {{Masamitsu}}, {{Boris}}, {{Jonas}}, {{Michael}}, {{Cigdem}}, {{Simona}}, {{Martin}}, {{Jesus}}, {{Felix}} 1. **Introduction** @@ -249,6 +249,8 @@ Minutes written by {{Felix}} * Summary of machine activities since last BDM, i.e., of KW 25 * * Incidents/Issues + * Archiver performance not meeting expectations + * Felix will follow up with Tadej * PSYS beam dump today * needs to be followed up * Beam Dump Kicker Issue: Saturday Evening the BDK did not recover after a beam dump @@ -257,10 +259,21 @@ Minutes written by {{Felix}} * **Despite unfortunately not having a pulsed magnets piquet service, we luckily have a highly motivated Martin who came to PSI from Zurich during the night from Saturday to Sunday and managed to fix the beam dump kicker after ~5 hours enabling further operation at nominal parameters over the weekend** * switches not holding high voltage, issue with one of the switches * abnormal power consumption from the HV PS + * switch degraded and features increased leakage current + * interlock due to monitored average power from HV PS + * switch exchanged for test switch which needed second tunnel access for quickfix and confirmed to be the underlying issue + * possibly linked to radiation damage of semiconductor (very high gain thyristors) + * according to company this should not be the case + * we need to prepare easy procedure for final beam dump to operate with 2/4 or 3/4 stages + * leakage current started rising 1-2 hours before incident + * manual beam dump tests only feasible without RF outage for current below 10 mA * ALIMA-CV-a6:I-SET Offset * Set/RB comparison alarm * RB does however follow set with offset * [elog](https://elog-gfa.psi.ch/SLS/61358) - Lukas suggests to increase alarm tolerance --> yes, please but also fix the PS since it has significant offset + * PS currently still in Paolo's responsibility + * Lukas willi follow up with Paolo + * Replacement of the power supplies is foreseen for 2026/2027 and will move responsibility to the power supply group * Beamdrop starting at shift handover on Friday * After Injection issues operators switched back to workaround timing system * root cause unclear - maybe a silent interlock or crash/limit reached for timing master filling pattern local mode @@ -288,42 +301,58 @@ Minutes written by {{Felix}} ![K2_1721](files/20250623_K2_1721.png) ![K2_1731_WithFan](files/20250623_K2_1731_WithFan.png) * Next steps: X-Ray, swap for spare chamber + * X-ray in August shutdown * **Linac and LTB Optimization** by {{Jonas}}, {{Simona}} and {{Volker}} * [elog](https://elog-gfa.psi.ch/SLS+Development/2511) - - * **Booster/BRTL Optimization** by {{Jonas}} - * ... - - * **Storage Ring Optimization** by {{Masamitsu}} - * ... + * goal was to switch off solenoids + * Jonas optimized for max charge day before and achieved 600 pC at gun bias 40 kV + * 600 pC at gun bias 40 kV was achieved also with one solenoid switched off + * Optimal transmission for 300 pC from Linac + * High sensitivity to orbit in LinaC * **Feedbacks and BPMs** by {{Boris}} + * [elog](https://elog-gfa.psi.ch/SLS+Development/2508) * [elog](https://elog-gfa.psi.ch/SLS+Development/2510) * spikes on BPM data + * stops FOFB every 70 seconds + * scale of issue not yet clear, next FOFB version will count these spikes + * synchrotron oscillations on order of um observed at dispersive BPMs while usually nm + * LLRF feedback not changed + * Test of switching LLRF off to confirm it as source should be performed + * supression of booster induced orbit distortion by FOFB + * possible if spike issue fixed + * goal is to get FOFB running with low gain to supress 3 Hz distortions by order of magnitude + * higher gain increases risk of FOFB outage * **RF** by {{Lukas}} - * ... + * 3HC spectrum analyzer could be used to compare sidebands with issue observed by Boris + * pressure fluctuations being investigated, possibly related to gauge + * LLRF upgrades of HLA performed enabling diagnostic post mortem tests + * LLRF FW upgrade to be done * **Diagnostics** by {{Cigdem}} - * ... + * PCT noise level worse than SLS - 1 + * Beam size measurement is running, EPICS PVs with customizable ROI array would be nice + * Horizontal emittance measurement showing increased beam size not 100% understood + * knife edge scan from PX-III can be used for comparison + * contribution from spurious dispersion + * continuous measurement of energy spread and emittance/beam size challenging due to small beam size * **ID Feed Forward** by {{Masamitsu}} and {{Simona}} and {{Dirk}} - * ... + * PX-II asked for smallest gap setting so far --> EPICS soft limit at 100 mA * **Pulsed Magnets** by {{Martin}} - * ... + * preparing final beam dump system + * priority of health monitoring system dropped + * prototype will be finished but final setup needs to be transferred to AEK request + * exchange of pinger HV PS planned - * **Impedances and MBFB kickers** by {{Micha}} - * ... - - * **Timing** by {{Romain}} - * ... - - * **ID Feed Forward** by {{Masamitsu}} and {{Simona}} and {{Dirk}} - * ... - - * **Shift Summaries** + * **Girder Alignment** by {{Michael}} + * all alignment data (sectors 1,2,3,4,5,6,8) in model illustrates necessary movements for required angle change for ADDAMS (X04SA) shows significant realignment would be required to correct the 50 urad + * root cause of this error to be investigated + * wait for full picture (data from Karsten) before decision of compromise between alignment to zero vs alignment to global smoothing fit + * need to be very transparent with beamlines while taking these decisions 3. **Requests** diff --git a/docs/schedule.md b/docs/schedule.md index 5e7405a..7403943 100644 --- a/docs/schedule.md +++ b/docs/schedule.md @@ -13,8 +13,9 @@ template: schedule.html | `00:00 - 24:00` | Top-up, 400 mA | Beamline development | OP shift crew | | **Tuesday, 24.06.2025** {: colspan=4} | ⁠ {: style="padding:0"} | ⁠ {: style="padding:0"} | ⁠ {: style="padding:0"} | | `00:00 - 07:00` | Top-up, 400 mA | Beamline development | OP shift crew | -| `07:00 - 15:00` | unstable | Machine development ??FOFB | ?? | -| `15:00 - 24:00` | unstable | Machine development ??FOFB | ?? | +| `07:00 - 09:00` | unstable | operator training | ?? | +| `09:00 - 17:00` | unstable | FOFB development ??FOFB | {{Boris}} and Jonas | +| `17:00 - 24:00` | unstable | Machine development ??FOFB | {{Boris}} | | **Wednesday, 25.06.2025** {: colspan=4} | ⁠ {: style="padding:0"} | ⁠ {: style="padding:0"} | ⁠ {: style="padding:0"} | | `00:00 - 07:30` | unstable, all gaps open | FOFB development | {{Boris}} | | `07:30 - 08:00` | unstable | Beam Dump and refill to 60 mA | OP shift crew |