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V. Ayvazyan, M. Clausen, B. Petersen, S. Putselyk, T. Schnautz

RF heat load compensation with electrical heaters for XFEL accelerator – measurements at CMTB, AMTF and FLASH. V. Ayvazyan, M. Clausen, B. Petersen, S. Putselyk, T. Schnautz DESY – Maschine-Kryogenik-Supraleitung Notkestrasse 85, 22607 Hamburg. 2. Content. Cryogenics at XFEL

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V. Ayvazyan, M. Clausen, B. Petersen, S. Putselyk, T. Schnautz

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  1. RF heat load compensation with electrical heaters for XFEL accelerator – measurements at CMTB, AMTF and FLASH V. Ayvazyan, M. Clausen, B. Petersen, S. Putselyk, T. Schnautz DESY – Maschine-Kryogenik-Supraleitung Notkestrasse 85, 22607 Hamburg

  2. 2 Content • Cryogenics at XFEL • Stability requirement on pressure • Measurements at CMTB, AMTF and Flash accelerator • Future plans CEC/ICMC 2015, 28 June – 2 July, Tucson, Arizona S. Putselyk, DESY

  3. 3 XFEL Location CEC/ICMC 2015, 28 June – 2 July, Tucson, Arizona S. Putselyk, DESY

  4. 4 Simplified flow diagram of cryomodule string String connection box contains all cryogenic instrumentation. CEC/ICMC 2015, 28 June – 2 July, Tucson, Arizona S. Putselyk, DESY

  5. 5 Stability requirements on pressure and mass flow rates (steady-state operation) RF change of TESLA cavities versus pressure change : ca. 50 Hz / mbar Note from DESY RF experts: fluctuations should be limited to +/- 35 Hz to avoid RF phase shifts -> pressure stability better than +/- 0.7 mbar required -> specification +/- 1.0 % relative, i.e. +/- 0.3 mbar CEC/ICMC 2015, 28 June – 2 July, Tucson, Arizona S. Putselyk, DESY

  6. 6 RF heat load compensation with electrical heaters at steady-state operation mode (I) Three steps: • Read acceleration field (Eacc) • Recalculate to the cryogenic heat load • To compensate cryogenic heat load with electrical heater. CEC/ICMC 2015, 28 June – 2 July, Tucson, Arizona S. Putselyk, DESY

  7. 7 RF heat load compensation with electrical heaters at steady-state operation mode (II) Parameter of RF operation (FLASH accelerator): Absolute value of heating power Time constant for increase/decrease Long-time drift of GHe flow due to residual heating Quite similar considerations are applicable to the electrical heaters! CEC/ICMC 2015, 28 June – 2 July, Tucson, Arizona S. Putselyk, DESY

  8. 8 RF heat load compensation with electrical heaters at steady-state operation mode (III) CEC/ICMC 2015, 28 June – 2 July, Tucson, Arizona S. Putselyk, DESY

  9. 9 RF heat load compensation with electrical heaters at steady-state operation mode (IV) CEC/ICMC 2015, 28 June – 2 July, Tucson, Arizona S. Putselyk, DESY

  10. 10 RF heat load compensation with electrical heaters at steady-state operation mode (V) CEC/ICMC 2015, 28 June – 2 July, Tucson, Arizona S. Putselyk, DESY

  11. 11 RF heat load compensation with electrical heaters at steady-state operation mode (VI) CEC/ICMC 2015, 28 June – 2 July, Tucson, Arizona S. Putselyk, DESY

  12. 12 Future plans Experiments at CMTB, AMTF and FLASH accelerator showed that the heat load compensation scheme is feasible. • To develop the automatic programs for smooth operation between cryogenic and Low Level RF groups • To perform further measurements at CMTB with different operation parameters And to be prepared for XFEL commissioning ! CEC/ICMC 2015, 28 June – 2 July, Tucson, Arizona S. Putselyk, DESY

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