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MATLAB Feedback

MATLAB Feedback. Phase II Commissioning. Topics. Feedbacks for Phase II Early Phase II Commissioning Results Still to do for Phase II Challenges Ahead Plan and Schedule for Matlab Feedbacks Fast Feedback Plans. Phase II Commissioning Results.

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MATLAB Feedback

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  1. MATLAB Feedback Phase II Commissioning D. Fairley

  2. Topics • Feedbacks for Phase II • Early Phase II Commissioning Results • Still to do for Phase II • Challenges Ahead • Plan and Schedule for Matlab Feedbacks • Fast Feedback Plans D. Fairley

  3. Phase II Commissioning Results • Longitudinal Feedback commissioned thru BC2. Currently implemented as 7 different feedbacks (4 new loops) • Bunch Charge Feedback commissioned • Two additional feedbacks commissioned (bonus!) • Gun Launch • X Cavity Launch • Our physicists are happy with the results - report that when the feedbacks are turned off the machine drifts within minutes D. Fairley

  4. LCLS – Accelerator and Bunch Compressor Schematic D. Fairley

  5. Screen Shots D. Fairley

  6. Screen Shots D. Fairley

  7. Screen Shots D. Fairley

  8. Phase II Commissioning, cont. • Feedback Framework has been successful in making installation and use of new feedbacks easier. • General Purpose utilities for all feedbacks • Configuration utility • Reference Orbit collection, editting, loading • Restore Actuator utility • Start, Stop, Enable, Disable control • Setpoint scanning capability • Transverse feedbacks are easiest to clone • Has been useful for Longitudinal feedback, since this is one feedback defined by many similar loops D. Fairley

  9. Phase II Commissioning, cont. • Process for making a new feedback: • If necessary, create up to three new matlab scripts for the feedback: getMatrix function, loop init function, loop algorithm.* • Add EPICS DB template for each new feedback and re-build soft IOC * • Create a configuration file for the feedback • Create EDM screens for the new feedback * • Update ChannelWatcher config • Add Alarms for the feedback • Archive new feedback PVs * Usually done by copy and edit D. Fairley

  10. Still to go for Phase II • Several Feedbacks are not completed; we are waiting for EPICS controlled BPMs, Magnets, and RF. • Longitudinal must include DL2 Energy • L2 Launch • L3 Launch D. Fairley

  11. Challenges for Phase II • Using two klystrons to control 26+ klystrons for BC2, sometimes there is no solution for the longitudinal feedback. • Cross-talk between transverse feedbacks may be an issue when L2 and L3 Launches are installed • Better cooperation between Laser-Cathode Alignment GUI and Gun Launch could help. • We are still learning how various subsystems effect the feedbacks (as above, cathode alignment, klystrons at L2, charge changes, etc) and vice-versa. There will be more adjustments as commissioning continues… D. Fairley

  12. Plan and Schedule • Short-term (before end of this run) • Commission L2 Launch feedback • Make Desired Energy and Desired Chirp ‘virtual’ actuators for the longitudinal feedback. These will take an Energy and Chirp value and control the 24-1 and 24-2 klystron phases accordingly. • Add feedback setpoints and limits to SCORE for save/restore • Disallow 24-1 and 24-2 klystron ‘swap’ where the longitudinal feedback settles on a solution where the klystrons flip in phase D. Fairley

  13. Plan and Schedule • Later (Next Commissioning Run) • Formalize reference orbit usage • Commission L3 Launch feedback • Complete the Longitudinal thru DL2 D. Fairley

  14. Fast Feedback Plans • Feedback for 120 Hz with time-slot compensation needed by July 2010 • Feedback for 60 Hz (no time-slot issues) needed by October 2009 • General plan • move feedback data transport to a dedicated network. • Move feedback processing into an IOC. • Setup implemented in new HLA framework D. Fairley

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