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Tuner & LLRF of ILC

Tuner & LLRF of ILC. Sun YI （孙毅）、 Wang Guangwei （王光伟） Lin Haiying （林海英）、 Qiu Feng （邱丰） Dec.7, 2010 3th workshop of KEK/IHEP on ILC. Outline. Conception is changed from RING to Linac A tuner have been fabricated and test Tuning loop FB on , to locked the frequency of MHI-04 cavity.

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Tuner & LLRF of ILC

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  1. Tuner & LLRF of ILC Sun YI （孙毅）、Wang Guangwei（王光伟） Lin Haiying（林海英）、 Qiu Feng（邱丰） Dec.7, 2010 3th workshop of KEK/IHEP on ILC

  2. Outline • Conception is changed from RING to Linac • A tuner have been fabricated and test • Tuning loop FB on , to locked the frequency of MHI-04 cavity.

  3. First slide jack type tuner have been fabricated and test

  4. LLRF lab.

  5. Slide jack type Tuner and piezograting rule

  6. Tuner & Piezo test

  7. 8/9∏-mode influence Z Bandwidth 220KHzQL=5897 f(MHz) -3dB phase βin=0.17 VSWR=6.0

  8. 200V Piezo voltage ~2um ~0.20~600HZ

  9. Piezo test

  10. Test piezo

  11. Bead Pull Perturbation ( by Zhai Jiyuan)

  12. Antenna Coupling and Field Flatness Long antennas to increase the coupling (input coupler side 0.17, pickup side 0.32) reduced the input power, but made the field flatness worse put metal beads on the equator of cell#1 to increase the field and coupling in the input coupler side (not used now):

  13. Ball disturbing phase error #9 cell #1 cell

  14. ball disturbing cell #9 ~50KHZ 300 cell #1 ~10KHZ 100 ball speed=3mm/s #1 cell #1 cell #9 cell

  15. Tuner FB on under disturbing of cell #1 ~10KHZ 100ball speed = 0.3mm/s tuner FB on Disturbing off FB off #1 cell

  16. Piezo actuator

  17. Piezo On (sine、 sawtooth 、 rectangle) piezo 200V --8um --1.2KHz phase error piezo off

  18. Piezo=200V 0.1HZ rectangle & sinemeasured by grating rule: 2.5um

  19. Piezo=300V 0.1HZ sine & rectangle Piezo 300V→12um Measured by grating rule →6.5um Why ? 0.60← 1.5kHz PZ 300V --6.5um/2 --1.0KHz

  20. Digital LLRF is under adjusting Dr.Qiu Feng Ms.Lin Haiying

  21. Next year plan • 80K LN2 →MHI-04 for test Tuner mechanic performance 1) vacuum tank 2) motor • CW→pulse mode for LLRF loops

  22. Summary • The R&D of tuner and LLRF are initial, but we have the first 1.3GHZ Lab. over China, and have open the history. • the cavity frequency can be locked by the tuner FB loop within ±0.50, MHI-04 cavity Length can be changed 3um by the piezo. • A simple vacuum tank is under design for the future 80K cold test of tuner.

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