1 / 12

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

rgaither
Télécharger la présentation

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

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. 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

More Related