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Performance Degradation of the Low Level RF Control System for VUV-FEL

Performance Degradation of the Low Level RF Control System for VUV-FEL. Tomasz Jeżyński. Technical University of Łódź , Poland Deutsches Elektronen-Synchrotron, Germany. Outlook. VUV-FEL LLRF Source of perturbations Proposal for diagnostic. VUV-FEL - the pilot facility for the XFEL.

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Performance Degradation of the Low Level RF Control System for VUV-FEL

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  1. Performance Degradation of the Low Level RF Control System for VUV-FEL Tomasz Jeżyński Technical University of Łódź, Poland Deutsches Elektronen-Synchrotron, Germany

  2. Outlook • VUV-FEL • LLRF • Source of perturbations • Proposal for diagnostic Tomasz Jeżyński

  3. VUV-FEL - the pilot facility for the XFEL • 260 m long (tunel 100 m) • 6 Kyro Modules • TESLA technology • 48 superconductive cavities • Development platform for XFEL Tomasz Jeżyński

  4. Kyro module Tomasz Jeżyński

  5. Inside the tunnel Tomasz Jeżyński

  6. Tunnel Tomasz Jeżyński

  7. Low Level Radio Frequency – Goal(s) Provide stable RF field in cavity during beam • continuous operation Tomasz Jeżyński

  8. LLRF - requirements • Electrical field : 30 MV/m • Required field stability : 10-5 in amplitude, 0.01° in phase • Continuous operation is required one maintenance day per month Tomasz Jeżyński

  9. Low Level Radio Frequency System Tomasz Jeżyński

  10. Source of perturbation MO – phase VM – Pin, nn Klyston – Pout = f(Pin) RF Power distribution Probes – individual char Mixers – nn, offset ADCs – nn, offset Numerical errors DACs – nn, offset Timing – time & temp. Supplies Noise Tomasz Jeżyński

  11. Diagnostic of LLRF - Goals • Provide continuous operation of LLRF System • Reduce maintenance cost Tomasz Jeżyński

  12. Measurements points in LLRF Tomasz Jeżyński

  13. VS and signal from single cavity Tomasz Jeżyński

  14. Mean & std. of measured signals (VS) Tomasz Jeżyński

  15. Field Phase in Vector Sum Tomasz Jeżyński

  16. Unacceptable data from the system Tomasz Jeżyński

  17. LLRF in VUV-FEL Tomasz Jeżyński

  18. Diagnostic for VUV-FEL Tomasz Jeżyński

  19. What we know about EU-XFEL ? • What we know? • Technology is unknown • Structure (distributed? links?) • Algorithms (under development) • Diagnostic have to be: • Cheap • Flexible (easy modification, extend...) • Integrated with system • But, failures of diagnostic cannot stop operation Tomasz Jeżyński

  20. Proposal for diagnostic • Monitoring • Diagnostic • Calibration Tomasz Jeżyński

  21. Monitoring • Error detection • Timing signals (synchronization, phase) • Pfor & Pref • Probes • Field stability (RMS, p-p, ...) • Detuning • Loaded Q • Limits of set value • ... Tomasz Jeżyński

  22. Diagnostic • Detect malfunction • Locate damage hardware • Perform components tests • ADCs, DACs • Interfaces • Memory, DSP blocks ... • Timing distribution • ... Tomasz Jeżyński

  23. Calibration • Timing • Correction of parameters • Probes • Downconverters • ADCs & DACs offset • ... • Piezo tuning • ... Tomasz Jeżyński

  24. Recommendations • Provide possibility to read data form different points of the system • Design the universal diagnostic interface and implement it to all electronic boards • Integrate diagnostic elements in control system • Sources of test signals • RF Switches • ... • Provide self diagnostic for all boards Tomasz Jeżyński

  25. Conclusion It is possible to predict operation interrupt before it happens The diagnostic system should be integrated with control system and hardware Base on experience from TTF and VUV-FEL the diagnostic system will decgrease maintenance cost Tomasz Jeżyński

  26. END Tomasz Jeżyński

  27. Measurements points in LLRF Tomasz Jeżyński

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