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UOM Minutes Here the minutes of all UOMs are kept main.html

02/06/2026

  1. Introduction

    • Communication
      • The current machine schedule is available at https://sls.psi.ch/schedule/.
      • Machine development shifts with increased sensitivity to vibrations are marked with red text "(No Vibration)"
      • Please send shift requests ahead of the UOM meetings.

  2. Reports

    • Operation

      • Vacuum scrubbing since shutdown with installation of elliptical undulator UE38 in X07M
        • good start with fast ramp up to 400 mA with acceptable lossratio
        • accumulating beam dose fast, i.e., 77 Ah accumulated since shutdown
        • lifetime unfortunately not improving since last week, i.e., stuck at 7 hours
        • beam size unfortunately also not improving since last week, i.e.,
          • horizontal: 11 μm
          • vertical: 27 μm
        • Scrubbing with closed IDs starting this weekend

      plots from scrubbing

      • ID measurements
        • Feed Forward tables for second UE36_1 and UE38 measured
        • FF tables implemented in epics
        • Perturbation from UE36_1 found to be larger than previously installed UE36_2 potentially due to measurements happening before alignment

    • Beamline Development Shifts

      • SU checks after shutdown

        • went well

      • Polarization switching orbit bump for PolLux

        • elog
        • Tests show significant perturbation of machine optics including significant blow up of the vertical beam size that will be noticeable by other beamlines
        • Dynamic feed forward optics correction will be very challenging
        • Further investigations needed

      • Single Bunch Tests SuperXAS

        • Issue with broader peak in detector 120 instead of 20 ns from expected still present
        • Timing signal from EVR seems to be fine according to timing expert
        • From detector side also everything seems to be fine according to beamline expert
        • Analysis of event stream and detector data (photons and triggers) and investigation of distribution next step to understand issue, i.e., are photons or events or both fluctuating

  3. Requests

    • PolLux shift for testing single bunch

      • parasitically possible with bunch train
      • will be done and exchange with SuperXAS on the topic

    • Orbit bumps

      • startup next week with same bump settings as end of last year except SIM

  4. AOB

    • Beamline Info Panels

      • Please make sure every beamline expert knows how to open and fully understands the beamline info panel
        • e.g., caqtdm -noMsg -noMsg -attach -macro Beamline=X01DA /sls/op/config/qt/X_Info_Panel.ui
        • feedback: FOFB information and beam size would be useful on this panel
        • beamsize PVs from diagnostic beamlines:
          • X01DD-FE-CAM1:SIG-X
          • X01DD-FE-CAM1:SIG-Y
          • X08DB-FE-CAM1:SIG-X
          • X08DB-FE-CAM1:SIG-Y

    • Beamline Phone Numbers

      • Beamline overview including telephone at sls.psi.ch
        • please take the requirement of having a phone number for your hutch seriously
        • please send me an email with your phone number

    • Criticallity of vertical beam size blow up

      • Not really but smaller would be better
      • No specific threshold
      • Corresponding increase of divergence (the observed beam size blow up is an emittance blow up, i.e., beam size and divergence are increased) is more critical

Minutes written by {{Felix}}

03/12/2025

  1. Introduction

    • Approval of last minutes

      • All those present confirm the minutes of the last meeting.

    • Communication

  2. Agenda

    • Machine Status

      • Nominal operation conditions
        • 13 hours lifetime at 400 mA
        • FPFB is running minimizing the current variation along the bunch train
        • top up current thresholds 400 and 403 mA with ~6.5 minutes between each top up
      • Machine availability has been ~98 % with an MTTR of ~35 minutes during the last weeks, i.e., since start of user operation

    • Operation Schedule

      • Operation until Christmas with start of phase 2 shutdown following DUO schedule https://duo.psi.ch/duo/public_calendar.php
        • Camshaft Tests for SuperXAS during today's beamline development shift
          • If successful we keep the camshaft fill pattern until Sunday
          • For Monday the camshaft charge will be reduced to match the average bunch charge of the train
        • Remain in regular user operation schedule with
          • Machine development from 7 AM on Tuesday until 7AM on Wednesday
          • Beamline development from 7 AM until 3 PM on Wednesday
        • Reserve weekend 20./21.12. not yet decided
          • Would it be ok if we share, i.e, machine development on Sunday from 7 Am until 23 PM and user operation for the remaining time? No!

    • Beamline Panels

      • Please add the beamline operation info panels to your launcher and have it open on your console
        • e.g., caqtdm -macro Beamline=X01DD /sls/op/config/qt/X_Info_Panel.ui
        • control of beamline and view of machine/total orbit bump for your sourcepoint
        • control/view of your absorber/shutter (bend) or gap/shutter (ID)
        • small accelerator status overview
        • operator messages
        • easy access to related panels
        • feedback welcome
        • panel updates have been made, please restart open panels
          • Light Delivery status is now visible
        • separate beamline non-expert panel in preparation

    • Light Delivery

      • When light delivery is available for your beamline type (Dipole / ID) you need to do the following to get light:
        • set your attended status to attended or remote
          • this will automatically set all CLOSE4OP PVs to enable and the gap control to Experiment
        • for dipoles
          • enable your absorber and shutter control (...CLOSE4BL PVs)
          • open your absober and shutter
        • for IDs
          • enable your shutter (...CLOSE4BL PV)
          • close your gap

    • Beamline Phones

    • UE36 in X11 from SIM beamline stuck

      • 2 hour Tunnel access during yesterdays machine development shift revealed that one of the 4 magnet arrays is stuck and the assumption is that the pneumatic brake is stuck
        • transmission train: motor, brake, bearings, spindle
      • Roughly half day is required to do the repair.
      • Tunnel access must be finished by 2 PM
      • Feedback
        • Debye is fine
        • SuperXAS desperately needs user operation in afternoon
        • Tomcat, ADDAMs and PX would prefer a shorter access
      • Strategy
        • best case finish by 11 AM
        • try to finish by 12
        • worst case finish tunnel access at 2 PM

  3. Requests

    • Wed., 10.12.2025 (KW50)
      • Tunnel access for repair work on UE36
    • Wed., 17.12.2025 (KW51)
      • requests by mail
      • beamline plans exist

Minutes written by {{Felix}}

05/11/2025

  1. Introduction

    • Approval of last minutes

      • All those present confirm the minutes of the last meeting.

    • Communication

  2. Agenda

    • Machine Status

      • Back to nominal operation conditions after ID bake efforts out during shutdown, i.e.,

        • 12 hours lifetime at 400 mA

        • top up current thresholds 400 and 403 mA with ~ 5 to 6 minutes between each top up
      • Cooling issue encountered over weekend:
        • Outage of tunnel air conditioning unit nr. 5 for arc 9 starts Sat. 3:16
        • Beam loss due to temp interlock 33 minutes later Sat. 3:49
        • Tunnel accesss for cooling piquet to exclude water leak
        • Beam limited to ~100 mA after repair of air conditioning unit
        • Issue followed by closed valve in cooling circuit of arc 9

    • Operation Schedule

      • Operation until Christmas with start of phase 2 shutdown without further interventions following DUO schedule https://duo.psi.ch/duo/public_calendar.php
        • First light for PXI today and tomorrow from 07-17:00
        • Next week (KW 46) beamline development
        • The week after (KW 47) begins user operation until 19.12.
        • Reserve weekend 20./21.12. not yet decided

    • Gitea Migration

      • auto deploy repos being migrated now and thus no update for machine software possible

    • Machine Status PVs for Beamlines

      • AGEOP-STATUS:INJECTION-ACTIVE
      • AGEOP-STATUS:INJECTION-WARMUP
      • AGEOP-STATUS:LIGHT-DELIVERY
      • AGEOP-STATUS:INJECTION-MODE
      • ? AGEOP-STATUS:MACHINE-STATUS (NOMINAL Operation, Beam Loss, ...)

    • Beamline Panels

      • Please add the beamline operation info panels to your launcher and have it open on your console
        • e.g., caqtdm -macro Beamline=X01DD /sls/op/config/qt/X_Info_Panel.ui
        • control of beamline and view of machine/total orbit bump for your sourcepoint
        • control/view of your absorber/shutter (bend) or gap/shutter (ID)
        • small accelerator status overview
        • operator messages
        • easy access to related panels
        • feedback welcome
      • The beamline orbit bump must only be changed in steps of 1 um or urad per second or slower
        • other wise the fast orbit feedback might fail
        • we need to gather some experience with user controlled bumps - it could be that additional machine protection measures have to be taken to ensure stable operation
      • Feedback
        • separate expert and user version of X_Info_Panel.ui would be nice

    • Top-Up Schemes

      • TOMCAT: shorter periodicity preferred, option 2 not required, scan duration anyhow longer than top-up periodicity and lost frames acceptable, depends heavily on how transparent the injection can be made
      • Debye: we see a signature of the injection (and pre-injection) on our data. Shorter periodicity would be rather detrimental. With the present injection scheme, Debye would be more wanting to push towards much less frequent top-up

    • Beamline Phones

  3. Requests

    • large bumps still possible this and next week afterwards only wednesday morning
      • X11MA would like to do some bump tests
    • X10DA/SuperXAS would like to do camshaft tests 3.12.

Minutes written by {{Felix}}

24/09/2025

  1. Introduction

    • Approval of last minutes

      • All those present confirm the minutes of the last meeting.

    • Communication

  2. Agenda

    • Machine Status

      • Limited performance due to high losses and bad lifetime from increased vacuum pressure after X02/U15 and X11/UE36 installation
        • Small aperture, 21 mm, 2m long copper vacuum chamber upstream of X11/UE36 was removed and replaced with 40 mm chamber with additional pumping intersection
        • Machine performance from loss / lifetime perspective now acceptable
        • Beam size remains increased by factor ~2
        • For more infos, see last meeting on the topic: https://indico.psi.ch/event/18038/

    • Operation Schedule

      • Operation until October shutdown without further interventions following DUO schedule https://duo.psi.ch/duo/public_calendar.php
        • Machine development / scrubbing until 13:00 today
        • First light for SIM today from 13-17:00
        • First light for I-TOMCAT tomorrow and Friday from 8-17:00
        • Beamline development from today until October shutdown
        • Machine development next Tuesday and Tuesday until Friday morning the week after

    • Beamline Panels

      • Please add the beamline operation info panels to your launcher and have it open on your console
        • e.g., caqtdm -macro Beamline=X01DD /sls/op/config/qt/X_Info_Panel.ui
        • control of beamline and view of machine/total orbit bump for your sourcepoint
        • control/view of your absorber/shutter (bend) or gap/shutter (ID)
        • small accelerator status overview
        • operator messages
        • easy access to related panels
        • feedback welcome
      • The beamline orbit bump must only be changed in steps of 1 um or urad per second or slower
        • other wise the fast orbit feedback might fail
        • we need to gather some experience with user controlled bumps - it could be that additional machine protection measures have to be taken to ensure stable operation

    • Top-Up Schemes

      • TOMCAT: shorter periodicity preferred, option 2 not required, scan duration anyhow longer than top-up periodicity and lost frames acceptable, depends heavily on how transparent the injection can be made
      • Debye: we see a signature of the injection (and pre-injection) on our data. Shorter periodicity would be rather detrimental. With the present injection scheme, Debye would be more wanting to push towards much less frequent top-up

    • Beamline Phones

    • Console issue today

      • a significant fraction of the consoles in the control room spontaneously rebooted this morning around 6 thus stopping any local feedback loops and destroying any locally recorded data
      • the same is observed on many beamline consoles

  3. Requests

    • X11MA / SIM: 400 mA for first light starting at 13:00 on Wednesday, September 24th, 2025
    • X02SA / I-TOMCAT: 60 mA for first light starting at 8:00 on Thursday, September 25th, 2025
    • X04SA / ADDAMS: aligning undulator is desired --> possibly Wed. 1st October until 3 PM

Minutes written by {{Felix}}

10/09/2025

  1. Introduction

    • Approval of last minutes * All those present confirm the minutes of the last meeting.

    • Communication

  2. Agenda

    • Machine Status

      • Limited performance due to high losses and bad lifetime
        • Removal of newly installed UE36 in X11 not yet decided, next decision meeting Wednesday, 17.09.2025
        • Ongoing investigations and planning: https://indico.psi.ch/event/18002/
      • Operation until then
        • Machine development today until evening
        • Beamline development from today evening until Monday morning
        • Machine development Monday
        • Beamline development from Tuesday morning (Powder Diffraction School measurements Tuesday/Wednesday)
        • Maybe Shutdown beginning Wednesday evening

    • Alignment

      • Detailed overview: download
      • Main takes:
        • No actions necessary on beamline side before October shutdown (multiple machine alignment tasks ongoing)
        • Final machine alignment only achieved after phase 2 shutdown
          • Larger orbit bumps can be provided until completion of phase 2, i.e., ~summer 2026 (by then beamlines should be aligned to the machine)
          • Further alignments may become necessary (e.g., due to settlements or incidents)
        • For smaller orbit bumps we will provide a tool for the beamlines after the October shutdown

    • Beamline Panels

      • Please add the beamline operation info panels to your launcher and have it open on your console
        • e.g., caqtdm -macro Beamline=X01DD /sls/op/config/qt/X_Info_Panel.ui
        • control of beamline and view of machine/total orbit bump for your sourcepoint
        • control/view of your absorber/shutter (bend) or gap/shutter (ID)
        • small accelerator status overview
        • operator messages
        • easy access to related panels
        • feedback welcome
      • The beamline orbit bump must only be changed in steps of 1 um or urad per second or slower
        • other wise the fast orbit feedback might fail
        • we need to gather some experience with user controlled bumps - it could be that additional machine protection measures have to be taken to ensure stable operation

    • Top-Up Schemes

      1. Lower and upper beam current thresholds defining top-up (e.g., adjusted for on average 3 min top-up periodicity)
        • top-up starting time defined by lifetime and current thresholds
        • top-up duration defined by injection efficiency and current thresholds
        • advantages: stable average beam current, stable average top-up duration
        • disadvantages: gating beamline measurement requires external trigger, i.e., EPICS or timing Event
      2. Fixed periodicity (e.g., 3 minutes) and upper beam current threshold defining top-up
        • top-up starting time predefined by desired periodicity
        • top-up duration defined by injection efficiency, current thresholds and lifetime
        • advantages: gating beamline measurement with local timer possible, i.e., time until next top-up fixed and known (useful for uninterruptible scanning measurements)
        • disadvantages: in rare cases significant fluctuations of beam current and top-up duration possible
      3. Bunch charge thresholds defining top-up
        • top-up starting time defined by lifetime and current thresholds of all individual bunches
        • top-up duration is 1 shot, i.e., 1/3 s
        • advantages: most stable average current
        • disadvantages: same as 1. and many individual top-ups (fine if transparent injection can be achieved)
      • Main Questions
        • preferred periodicity, i.e., how many minutes?
        • preferred top-up scheme?
        • comment: current change implies motion of sourcepoint (0.3 um/mA in both planes) giving stronger motivation for option 1
        • TOMCAT: shorter periodicity preferred, option 2 not required, scan duration anyhow longer than top-up periodicity and lost frames acceptable, depends heavily on how transparent the injection can be made

  3. Requests

    • PX-II bumps

Minutes written by {{Felix}}

27/08/2025

Participants: {{ChristianS}}, {{Jonas}}, {{Felix}}

  1. Introduction

    • Communication

  2. Agenda

    • Alignment

      • Detailed overview: download
      • Main takes:
        • No actions necessary on beamline side before October shutdown (multiple machine alignment tasks ongoing)
        • Final machine alignment only achieved after phase 2 shutdown
          • Larger orbit bumps can be provided until completion of phase 2, i.e., ~summer 2026 (by then beamlines should be aligned to the machine)
          • Further alignments may become necessary (e.g., due to settlements or incidents)
        • For smaller orbit bumps we will provide a tool for the beamlines after the October shutdown

    • Top-Up Schemes

      1. Lower and upper beam current thresholds defining top-up (e.g., adjusted for on average 3 min top-up periodicity)
        • top-up starting time defined by lifetime and current thresholds
        • top-up duration defined by injection efficiency and current thresholds
        • advantages: stable average beam current, stable average top-up duration
        • disadvantages: gating beamline measurement requires external trigger, i.e., EPICS or timing Event
      2. Fixed periodicity (e.g., 3 minutes) and upper beam current threshold defining top-up
        • top-up starting time predefined by desired periodicity
        • top-up duration defined by injection efficiency, current thresholds and lifetime
        • advantages: gating beamline measurement with local timer possible, i.e., time until next top-up fixed and known (useful for uninterruptible scanning measurements)
        • disadvantages: in rare cases significant fluctuations of beam current and top-up duration possible
      3. Bunch charge thresholds defining top-up
        • top-up starting time defined by lifetime and current thresholds of all individual bunches
        • top-up duration is 1 shot, i.e., 1/3 s
        • advantages: most stable average current
        • disadvantages: same as 1. and many individual top-ups (fine if transparent injection can be achieved)
      • Main Questions
        • preferred periodicity, i.e., how many minutes?
        • preferred top-up scheme?
        • comment: current change implies motion of sourcepoint (0.3 um/mA in both planes) giving stronger motivation for option 1
        • TOMCAT: shorter periodicity preferred, option 2 not required, scan duration anyhow longer than top-up periodicity and lost frames acceptable, depends heavily on how transparent the injection can be made

  3. Requests

    • Monday, 01.09., PSYS tests I-TOMCAT, PX-I, SIM
    • Wednesday, 10.09., Reserve I/O (escalation tests?)
    • X10SA, PX-II, sicher etwas Maschinen/BL Zeit, um das Alignment zu optimieren

Minutes written by {{Felix}}

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