Stanford Linear Accelerator Center Ron Chestnut EPICS Collaboration Mtg June 18-20, 20031 SLAC...
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Ron Chestnut EPICS Collaboration Mtg June 18-20, 2003 1 Stanford Linear Accelerator Center SLAC Tune Tracker/Feedback Mike Laznovsky
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Ron ChestnutEPICS Collaboration Mtg June 18-20, Tune Space
Transcript of Stanford Linear Accelerator Center Ron Chestnut EPICS Collaboration Mtg June 18-20, 20031 SLAC...
Ron Chestnut EPICS Collaboration Mtg June 18-20, 2003
1
Stanford Linear Accelerator Center
SLAC Tune Tracker/Feedback
Mike Laznovsky
Ron Chestnut EPICS Collaboration Mtg June 18-20, 2003 2
Requirements• Track tune per plane and per ring• Move “multiknob” to maintain tune• Switch ranges while tracking• Constant tune or current
dependent tune modes
Ron Chestnut EPICS Collaboration Mtg June 18-20, 2003 3
Tune Space
Ron Chestnut EPICS Collaboration Mtg June 18-20, 2003 4
Hardware• GPIB–driven SR830 lock-in amplifier• Tweaks the beam, watches response• Works best on non-colliding bunches• Phase response is almost linear in
region of interest• Four devices – (LER,HER) * (X,Y)
Ron Chestnut EPICS Collaboration Mtg June 18-20, 2003 5
S/W Implementation• All IOC support is “soft” or GPIB• Fairly flat database• Three sequence programs per device
— Amplitude Control— Tracking code— Feedback code
• One sequence program for VMS synchronization
Ron Chestnut EPICS Collaboration Mtg June 18-20, 2003 6
General H/W control
Ron Chestnut EPICS Collaboration Mtg June 18-20, 2003 7
Tune Scan Panel
Ron Chestnut EPICS Collaboration Mtg June 18-20, 2003 8
PEP-II Tune Scan
Ron Chestnut EPICS Collaboration Mtg June 18-20, 2003 9
Tracker panel
Ron Chestnut EPICS Collaboration Mtg June 18-20, 2003 10
Feedback Panel
Ron Chestnut EPICS Collaboration Mtg June 18-20, 2003 11
Some Results
Ron Chestnut EPICS Collaboration Mtg June 18-20, 2003 12
SLAC status – an aside• LCLS
— demonstrate injector by 10/2006— modify SLC timing to accommodate LCLS— SPPS now working (ANL Undulator)
• VXI PPC (Kinetics) has worked in production
— Supports 4 new PEP Low Level RF boards• Stephanie from ESD to SPEAR• Unix infrastructure work –
Versioning, Deployment, Escalation
Ron Chestnut EPICS Collaboration Mtg June 18-20, 2003 13
More SLAC status• 8-Pack (NLC Test Accelerator) software
in commissioning• Oracle Archiver
— Scalar PV access is about 2x slower than file-based access
— Waveform access is very slow— Changing waveform storage to VARRAY— Matlab Channel Archiver access
(Uses libIO, works with traditional files too)
