diff --git a/docs/machine/mdm.md b/docs/machine/mdm.md index 88a0547..1835a8c 100644 --- a/docs/machine/mdm.md +++ b/docs/machine/mdm.md @@ -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:** diff --git a/mkdocs.yml b/mkdocs.yml index d22aa01..53df9aa 100644 --- a/mkdocs.yml +++ b/mkdocs.yml @@ -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} | ⁠ {: style="padding:0"} | ⁠ {: style="padding:0"} | ⁠ {: style="padding:0"}'