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@@ -113,6 +113,124 @@ Minutes written by {{Felix}}
{{Volker}},
-->
## 28/04/2026
**Participants:**
, {{Felix}}
1. **Introduction**
* **Approval of last minutes**
* All those present confirm the [minutes](https://sls.psi.ch/machine/mdm/#14042026) of the last meeting.
* **Communication**
* The current machine schedule is available at [https://sls.psi.ch/schedule/.](https://sls.psi.ch/schedule/)
* Please send shift requests ahead of the MDM meetings.
* Elog
* Please prepare your shift reports in the elog before the next MDM.
* Any changes made to the machine (e.g., optics, orbit or machine interlock bridges) must be documented in the elog
* Control Room Etiquette
* Please keep voices down in the control room and go elsewhere for intense discussions.
* Please remember to always keep the control room informed, i.e., talk to the operators before starting and after finishing your shift/maintenance/repair work
* Spontaneous on-site shifts, e.g., over the weekend or night should be announced in advance to the control room.
2. **Reports**
* **Operation** by {{Felix}}
* Summary of Machine Activities since last MDM
* 400 mA at ~10 hours lifetime
* updated post mortem elog
* Incidents/Issues
* Mysterious reboot of timing master
* Beam dump with vacuum peak at fast kicker
* **Linac/LTB Optimization** by {{Jonas}}
* ...
* **Booster/BRTL Optimization** by {{Jonas}}
* ...
* **Storage Ring Optics** by {{Masamitsu}}
* ...
* **RF** by {{Lukas}}
* ...
* **Pulsed Magnets** by {{Martin}}
* ...
* **Diagnostics** by {{Cigdem}}
* ...
* **SU Linac Mapping for BAG** by {{Rebecca}}, {{OliverC}}, {{Felix}}
* successful mapping of linac following old unclear (which screen, where exactly were the detectors installed) documentation completed
* old charge settings (0.46 and 1 nC) from last linac mapping from 12.09.2023 no longer possible, measurements repeated with 0.35 and 0.7 nC
* additional detectors enabled quicker survey
* **ABOMA-B warmup-cycle optimization** by {{Felix}}, {{Jonas}}, {{Beat}}
* scrubbing / topup tool now has the feature to control nr. of warmup cycles for each triggered, i.e., pulsed/ramped injection element with dedicated event individually
* warmup cycles reduced from 45 to 5, also 0 or 1 seem to be fine but limitation of injection diagnostic makes analysis difficult
* further optimization requires synchronized PCT measurements with SR PCT delta delivering same noise level as booster PCT
* long-term it seems necessary to implement PID control for more pulsed magnets
* significant excitation of vertical beam size from 4-kicker bump observed motivating to reduce warmup cycles
* **Timing Cleanup** by {{Romain}} and {{Felix}}
* Old, forgotten gun event interlock stopping the gun trigger cost a lot of time
* Timing master FPFB input bug discovered
* After further timing update mishaps were identified and corrected, reloading of old pre-shutdown timing settings enabled >90 % injection efficiency
* DBUS7, i.e., revolution synchronization for many systems (e.g., APD, BDC, ...), is now an actual revolution trigger, i.e., 1.04 MHz instead of the 16-fold booster revolution trigger (= 15-fold ring revolution trigger)
* In future the revolution trigger will be synchronized to an external timing master independent frequency divider locker to the 500 MHz enabling timing master reboot/failure persistent revolution trigger and thus bucket 0 definition
* **Beam Dump Synchronization** by {{Ian}}, {{Romain}}, {{Felix}}
* EPICS side is prepared for new FW and enables delay control
* So far tests have not been successful and debugging attempt by putting revolution clock the BDC obtains from DBUS7 on a scope showed issues
* In test stand it looked find indicating possible issue with fanout in WSLA/SLS
* today successfully tested with direct connection to output of master in WSLA/SLS [https://elog-gfa.psi.ch/SLS/64007](https://elog-gfa.psi.ch/SLS/64007)
* **Feedbacks and BPMs** by {{Boris}}
* FPFB:
* Now has RFFE with remotely adjustable gain.
* Gain settings taken into account for charge calculation.
* Safety features implemented & tested in shift to avoid that ADC is killed by high input signals.
* New calibration of charge done, system can be used now.
* Algorithm to calculate charge needed modification since pulse shape of new RFFE is different from previous direct beam signal
* MBFB:
* Fast kicker excitation frequency sweep for vertical MBFB kicker tested and working. To be implemented also for horizontal & long. plane (not yet done).
* Test with direct sampling RFFE for transverse MBFB confirmed that direct sampling will need oversampling with several ADC, plus modified RFFE pulse shaping.
* This is a lot of work -> continue using downconversion RFFE for now.
* We will continue work on direct sampling for longitudinal MBFB (where implementation is simpler)
* BPMs
* New firmware with post mortem buffer implemente and tested last Thursday. Bugs found, some fixed, some to be fixed (clock domain crossing not yet working properly -> missing samples etc.). Expect new firmware next week.
* **SLS 2.0 beam energy measurement via resonant spin depolarization** by {{Yi}} and Co.
* Started with slow EPICS controlled sweep and continued with faster low level sweeps
* MBFB kicker strength 40 uRad should enable complete RDP within 10 ms, allowing for 100 Hz/s scan rate
* Despite multiple attempts (400 mA in 450 buckets, 55 mA in 50 buckets, removed dispersion bump, tried mirror tune) no RDP observed
* **3HC He Valve Regulation Shift** by {{DanielD}}
* successfully tested setting tighter valve range limits for 400 mA top-up
* but required to be linked to the current current in the storage ring or voltage in the 3HC for operational use
3. **Shift Requests**
* [x] SU Collimator setup ({{Rebecca}}, {{OliverC}}, {{Felix}}, {{Masamitsu}})
* [x] X11MA 2nd UE36 Feed Forward measurement and implementation ({{Simona}}, {{Dirk}})
* [] Beam Dump Optimization in time and amplitude ({{Felix}} and {{Martin}})
* [] test disabling of BPMs in FOFB | {{Boris}}, {{JonasP}}, {{Goran}} (3 shifts, 1 before shutdown)
* [] checks with beam size monitors after recovering vacuum ({{Cigdem}}, {{Masamitsu}})
* [] test new revolution trigger with external reference ({{Romain}}, {{Felix}})
* [] setup/check post mortem for new Libera BLMs ({{Cigdem}}, {{Felix}})
* [] SU checks for dipole beamlines (and X11MA which is already requested) --> short notice during OP Training shifts after machine required SU shifts are completed
* [] XBPM measurements in Juli
* [] Beam Dump Kicker Optimization in time and amplitude ({{Felix}} and {{Martin}})
Minutes written by {{Felix}}
## 14/04/2026
**Participants:**
mkdocs.yml
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@@ -187,6 +187,7 @@ extra:
Thomas : '[Thomas](https://intranet.psi.ch/de/people/thomas-schietinger "Thomas Schietinger"){:target="_blank"}'
Uros : '[Uros](https://intranet.psi.ch/de/people/uros-zezula "Uros Zezula"){:target="_blank"}'
Volker : '[Volker](https://intranet.psi.ch/de/people/volker-schlott "Volker Schlott"){:target="_blank"}'
Yi : '[Yi](https://intranet.psi.ch/en/people/yi-wu "Yi Wu"){:target="_blank"}'
Zheqiao : '[Zheqiao](https://intranet.psi.ch/de/people/zheqiao-geng "Zheqiao Geng"){:target="_blank"}'
# Shortcodes
_ : '{: colspan=4} | &#8288 {: style="padding:0"} | &#8288 {: style="padding:0"} | &#8288 {: style="padding:0"}'