High Level Physics Applications Update on Plans, New Directions Fairley, Rogind, Allison, Zelazny, Chevtsov, Laznovsky

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High Level Physics ApplicationsUpdate on Plans,
New Directions Fairley, Rogind, Allison,
Zelazny, Chevtsov, Laznovsky

• Outline
• Required High Level Applications for Injector
  Commissioning
• Interim deliverables
• Long-term plans

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High Level Physics Applications for Injector
Commissioning

• The original plan for high level applications
  called for making use of both the XAL and SLC
  applications suites
• The XAL use included
• Emittance application
• On-line Model to provide model parameters to the
  Emittance application
• Energy spread application
• Bunch Length Measurement application

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High Level Physics Applications for Injector
Commissioning

• All other required applications were to be
  provided by the SCP
• Orbit Applications
• Orbit display
• Orbit fitting
• Orbit corrections
• Bump calculation
• Power steering
• These applications require CAMAC magnet control
• will not be available via EPICS before injector
  commissioning, so the SLC system and SLC-aware
  IOCs will provide orbit apps during first
  commissioning.

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High Level Applications Change in Direction

• The applications group has been temporarily
  re-assigned to other tasks
• Supporting Timing System, Fast Feedback, Magnet
  control, etc.
• The new plan for Injector commissioning calls
  for
• Making heavy use of MATLAB for application
  development
• Providing access to most control subsystems from
  MATLAB
• Enlisting the support of accelerator physicists
  in developing some of the required applications
• The Applications Group to provide the MATLAB
  interface to the accelerator data and the
  supporting infrastructure
• To migrate the applications to the XAL
  environment at a later date
• The critical Bunch Length Measurement application
  will be first prototyped it in MATLAB by the
  applications group
• The physics group will develop prototype
  Emittance / Energy spread applications in MATLAB

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Low-level control of all LCLS-specific devices
will be through EPICS

• Some applications require an interface to wire
  scanners and screens (OTRs/YAGs)
• The control for these and other new LCLS-specific
  devices will be available only through EPICS
• These applications will request scans or images
  via channel access from EPICS IOCs
• The applications will receive raw data and/or
  calculated parameters (beam sizes, etc.) from IOCs

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Injector commissioning will make heavy use of the
SLC control software

• Supporting software
• Online model transfer matrices and twiss
  parameters
• SLC on-line model for orbit applications
• XAL on-line model used for emittance and energy
  spread calculations
• Buffered acquisition - SLC
• Correlation plots - SLC
• Multiknob facility - SLC
• Configuration management - SLC
• Golden orbits, user set-points, constants
• Applications not listed here are not required for
  commissioning
• They will be attended to once commissioning apps
  are complete

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High Level Applications Requirements(PRD - by
Patrick Krejcik)

• The following applications are being prototyped
  in MATLAB, using LabCA to access IOC PVs, Aida to
  access LCLS Model data from SLC. 
• Bunch Length Measurement application (including
  the Transverse Deflector Cavity Feedback) - Mike
  Z., and Sergei C. with Paul Emma
• Emittance application - Debbie R. with  Henrik
  Loos
• Energy / Energy Spread - Debbie R. with Henrik
  Loos
• All other HLA will be provided by the SCP, using
  the SLC-aware IOCs to interface to Magnets, RF,
  BPMs and other measurement devices.

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High Level Applications Requirements(PRD - by
Patrick Krejcik)

• The LCLS online model will be implemented through
  the SLC database and the modeling facility
• integration and test of SLC-aware IOC with real
  hardware - Diane F. and Debbie R.
• The general approach for the MATLB prototype
  application development  is to
• have software engineers set up the LabCA and Aida
  interfaces to the IOCs and SLC model data
• identify the PVs required
• structure the application and help
  develop simulations to be used until actual
  devices are ready. 
• The physicists and software engineers will
  collaborate on creating a usable MATLAB
  application in each case.

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Fast Feedback Requirements PRD by Paul Emma

• Feedback loops will be prototyped in MATLAB,
  using LabCA to access IOC PVs, Aida to access
  LCLS Model data from SLC.
• MATLAB limits feedback loops to about 1Hz rate
• We will use the same prototyping approach
  described above.  We are currently working on a
  soft IOC "simulator" to support feedback
  development.
• The following loops are currently under
  development
• Bunch Charge  - Diane F. , Sheng P. , physicists
• Injector Launch - Diane F. and Juhao W.
• DL1 Energy - Diane F. and Juhao W.
• Spectrometer Energy - Diane F. and Juhao W.
• DL1 Energy BC1 Energy Bunch Length - Diane F.
  and Juhao W.
• Transverse Deflecting Cavity  - Mike Z., Sergei
  C., and Paul Emma
• The Injector Launch feedback  loop will also be
  prototyped in an Epics soft IOC.  This will give
  us a chance to prototype what will be the
  long-term design of the Fast Feedback loops for
  LCLS.

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Long-Term Goals for HLAPPS Fast Feedback

• Long Term Priorities for high level applications
• RDB support for XAL
• XAL online model
• XAL PVLogger
• All application developments in XAL
• Long Term Priorities for Fast Feedback
• Decision point - use state-space or classical
  (PID) formalism?
• Decision point - interface for fast feedback
  communications Front-runner - custom raw
  Ethernet interface on second Ethernet port.
• Implement a driver for this dedicated interface
• Formal design of a general Fast Feedback system,
  and implement in EPICS (based on SLC Fast
  Feedback architecture)