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

1. High Level Physics ApplicationsUpdate on Plans, New DirectionsFairley, Rogind, Allison, Zelazny, Chevtsov, Laznovsky Outline Required High Level Applications for Injector Commissioning Interim deliverables Long-term plans

2. 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

3. 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.

4. 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

5. 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

6. 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

7. 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.

8. 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.

9. 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.

10. 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)