15 KiB
15 KiB
title, description, template
| title | description | template |
|---|---|---|
| UOM Minutes | Here the minutes of all UOMs are kept | main.html |
22/10/2025
... Next Meeting
24/09/2025
-
Introduction
-
Approval of last minutes * All those present confirm the minutes of the last meeting.
-
Communication
- The current machine schedule is available at https://sls.gitpages.psi.ch/schedule/.
- Please send shift requests by e-mail ahead of the UOM meetings.
-
-
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/
- Limited performance due to high losses and bad lifetime from increased vacuum pressure after X02/U15 and X11/UE36 installation
-
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
- Operation until October shutdown without further interventions following DUO schedule https://duo.psi.ch/duo/public_calendar.php
-
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
- Please add the beamline operation info panels to your launcher and have it open on your console
-
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
- Every beamline should have at least one fixed and possibly also a mobile beamline phone number
- This is mandatory for safety reasons
- It would be great to add these to the beamline contact overview (https://intranet.psi.ch/de/sls-operation/verantwortliche-strahllinien) and also the panels
-
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
-
-
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
10/09/2025
-
Introduction
-
Approval of last minutes * All those present confirm the minutes of the last meeting.
-
Communication
- The current machine schedule is available at https://sls.gitpages.psi.ch/schedule/.
- Please send shift requests by e-mail ahead of the UOM meetings.
-
-
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
- Limited performance due to high losses and bad lifetime
-
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
- Please add the beamline operation info panels to your launcher and have it open on your console
-
Top-Up Schemes
- 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
- 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
- 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
- Lower and upper beam current thresholds defining top-up (e.g., adjusted for on average 3 min top-up periodicity)
-
-
Requests
- PX-II bumps
27/08/2025
Participants: {{ChristianS}}, {{Jonas}}, {{Felix}}
-
Introduction
- Communication
- The current machine schedule is available at https://sls.gitpages.psi.ch/schedule/.
- Please send shift requests by e-mail ahead of the UOM meetings.
- Communication
-
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
- 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
- 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
- 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
- Lower and upper beam current thresholds defining top-up (e.g., adjusted for on average 3 min top-up periodicity)
-
-
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}}