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