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LLRF Requirement and Parameters at ESS

LLRF Requirement and Parameters at ESS. Rihua Zeng , Anders J Johansson. LLRF workshop, Hamburg, 2011- 10-20. Picture from C. Carlile’s presentation at IPAC 2011. Neutrons in 2019 !. 5 MW beam power 2.5 GeV protons (H+) 2.9 ms pulses 14 Hz rep rate

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LLRF Requirement and Parameters at ESS

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  1. LLRF Requirement and Parameters at ESS RihuaZeng, Anders J Johansson LLRF workshop, Hamburg, 2011-10-20

  2. Picture from C. Carlile’s presentation at IPAC 2011

  3. Neutrons in 2019 ! • 5 MW beam power • 2.5 GeV protons (H+) • 2.9ms pulses • 14 Hz rep rate • 50 mA pulse current • 352.2 MHz • 704.4 MHz RF frequency • < 1 W/m beam losses • No accumulator/compressor ring ! Green field site Picture from G. Trahern’spresentation at ICALEPCS11

  4. Picture from G. Trahern’spresentation at ICALEPCS11

  5. More than 200 LLRF stations to be built by 2019 for RFQ, DTL, spoke and elliptical cavities . (One klystron for one cavity.) • Many issues to be addressed • Stringent demands from ESS leads to tough challenges Pulselength: 2.86 ms Rep rate: 14 Hz Current: 50mA LLRF Workshop 2011, R. Zeng, A. J. Johansson

  6. An universal recipe for LLRF? LLRF Workshop 2011, R. Zeng, A. J. Johansson

  7. To do list LLRF Workshop 2011, R. Zeng, A. J. Johansson

  8. To learn list … LLRF Workshop 2011, R. Zeng, A. J. Johansson

  9. To be listed list LLRF Workshop 2011, R. Zeng, A. J. Johansson

  10. Issues: multiple cavities control LLRF Workshop 2011, R. Zeng, A. J. Johansson

  11. Picture from S. Peggs’spresentation at IPAC 2011

  12. Issues: high effeciency • Klystron Linearization • Minimize power overhead. • Is 20% enough? LLRF Workshop 2011, R. Zeng, A. J. Johansson

  13. Issues: high availability • Availability at ESS 95% • Avoid failures that cause the whole system to fail • Redundancy • Automatically detect • Fast recovery LLRF Workshop 2011, R. Zeng, A. J. Johansson

  14. Issues: others • High intensity • Long pulse • High gradient • Spoke cavity LLRF Workshop 2011, R. Zeng, A. J. Johansson

  15. Design guidelines • Fault tolerant architecture and design • Redundancy or adaption? • Easy maintenance • Generic design for all LLRF stations? • Modular design? • Auto-config and auto-calibration? • Cost effective and long lived • Multiple vendors? • Software defined function by FPGA/DSP implementation for future upgrades? LLRF Workshop 2011, R. Zeng, A. J. Johansson

  16. Main architecture of ESS LLRF • FPGA based solution • Separate analog mixers for down- and up-conversion • I/Q-demodulation and modulation • Onemaster oscillator for the whole ESS • Phasereference for RF • Timereference for control, science • Global phase reference distribution • Coaxial phase reference line • EPICS control system LLRF Workshop 2011, R. Zeng, A. J. Johansson

  17. Interesting possibilities: • Co-design with Beam Instrumentation • Simplify upkeep of installation • Minimize cost of units for installation and inventory • Open Hardware solution • Multiple sources of hardware possible LLRF Workshop 2011, R. Zeng, A. J. Johansson

  18. What to do in the near future • Simulation for more detailed parameters and requirement LLRF Workshop 2011, R. Zeng, A. J. Johansson

  19. Build the prototype LLRF Workshop 2011, R. Zeng, A. J. Johansson

  20. More important, To ask more suggestions for the possible solutions at ESS Many thanks for your attention! LLRF Workshop 2011, R. Zeng, A. J. Johansson

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