1 / 15

Control System and CBETA-V Kirsten Deitrick

Control System and CBETA-V Kirsten Deitrick. With many slides from Colwyn Gulliford’s ICAP’18 talk. Introduction. GPT Online Model CBETA-V Basics BMAD/TAO Overview CBETA-V Online Model CBETA-Virtual Machine Control System Control System and CBETA-V

meris
Download Presentation

Control System and CBETA-V Kirsten Deitrick

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Control System and CBETA-VKirsten Deitrick With many slides from Colwyn Gulliford’s ICAP’18 talk

  2. Introduction • GPT Online Model • CBETA-V Basics BMAD/TAO Overview CBETA-V Online Model CBETA-Virtual Machine • Control System Control System and CBETA-V • Scripts Machine Running Measurements Orbit Correction Example • Conclusion kd324@cornell.edu

  3. GPT Online Model (Injector and Linac ≤ 42 MeV) Save / Load from file or optimizer Create Particles Run GPT Control Tabs BeamlineSettings Plotting + Analysis Load from EPICS kd324@cornell.edu

  4. BMAD/TAO Overview • Fortran 2008, O2 , Interface to C++ • Bmad can be run multi-threaded (w/few restrictions). • Lattice files use a MAD like syntax. • Well documented (Manual is ~500 pages). • Executable: Tao - a general purpose simulation & design program with • Twiss and orbit calculations. • Nonlinear optimization. • Analysis of complicated geometries. • Etc. • Tao’s object oriented coding makes it easy to extend: • >> Add custom commands to interface Tao with a control system. http://www.lepp.cornell.edu/~dcs/bmad/ CBETA Layout in TAO kd324@cornell.edu

  5. CBETA-V Online Model • Incorporates all TAO capabilities: perfect for those familiar with TAO • (Minimal) Custom code auto generates relevant variables/objectives for optimization • Handles TAO ↔ EPICS book keeping • EPICS get/put via linking to EPICS EZCA • Communication with EPICS → get Save/Restore for free • All conversion data stored in EPICS records: kd324@cornell.edu ELEMENT_POWER_SUPPLY_[CMD, RDBK] [Amps, Volts, etc] ELEMENT_FIELD_SCALE [Tesla/Amp, etc] ELEMENT_FIELD [Tesla, etc] Lattice Element

  6. CBETA-Virtual Machine • Python wrapper around CBETA-V • Creates a clone of the CBETA EPICS control/diagnostic PVs • Sync mode: monitor CBETA settings, serve up-to-date simulation data • Good for operators or those less familiar with TAO • Serves additional lattice data to EPICS: • Can send any TAO command via EPICS, results served as a string ELEMENT_s [m] ELEMENT_L [m] … Lattice Element kd324@cornell.edu

  7. CBETA-Virtual Machine Serves… • Entire 1-pass lattice (which will change as the machine does) • Energy • Orbit • Dispersion • Twiss parameters • Transfer matrices • Simulated viewscreens kd324@cornell.edu

  8. Control System • Underlying control through EPICS • Direct control through EDM • Archive logs flagged readbacks • Save/Restore (Restorinator GUI) for machine state • Measurements typically taken through Matlab scripts that talk to EPICS kd324@cornell.edu

  9. Control System and CBETA-V CBETA MACHINE Power Supplies Virtual PowerSupplies Virtual Diagnostics Diagnostics kd324@cornell.edu Serve: orbit, dispersion, Twiss, energy…

  10. Scripts • CBETA machine state can be passed into CBETA-V, helping with real-time machine control and subsequent offline analysis • Both CBETA and CBETA-V can be controlled with scripts • CBETA-V helps in creating/testing/demonstrating control and measurement scripts meant for the real machine • Many routine operations tasks and measurements have corresponding scripts More are created as necessary kd324@cornell.edu

  11. Machine Running • Phasing cavities • BPM position calibration • CBV Includes beam orbit, BPM intensity/bunch charge, radiation monitors Beam orbit is compared to CBETA-V, which tracks current machine settings kd324@cornell.edu

  12. Measurement • Orbit correction Automatically corrects orbit of beam through 1-pass lattice • Quadrupole dispersion measurement Calculates dispersion • Emittance measurement in splitter lines Measures emittance in the SX/RX lines • Emittance measurement EMS GUI (in the diagnostic line) Screen measurements (in the dump line) kd324@cornell.edu

  13. Orbit Correction • Script written by Adam Bartnik and Colwyn Gulliford • Beam is lost early due to misalignment, threads through the FFA arc as correctors are adjusted • Includes BPM noise/offset, quadrupole misalignment/errors, energy error (1% of MLC) kd324@cornell.edu

  14. Orbit Correction • Different initial orbits, all of which are wrong • Are eventually corrected kd324@cornell.edu

  15. Conclusion • Online models GPT (Injector and MLC) CBETA-V • CBETA Virtual Machine Combines CBETA-V and CBETA EPICS records Controlled in the same way as CBETA machine Real time / online data comparison Easy comparison to data analyzed offline Testing/Debugging real measurement scripts • Scripts Heavily incorporated into routine beam running and measurements • Future Work Update the CBETA-V lattice with machine (as pass number increases) Expand script collection to include more tasks/measurements as needed kd324@cornell.edu

More Related