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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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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.


First slide jack type tuner have been fabricated and test


LLRF lab.


Slide jack type Tuner and piezograting rule


Tuner & Piezo test


8/9∏-mode influence

Z

Bandwidth 220KHzQL=5897

f(MHz)

-3dB

phase

βin=0.17

VSWR=6.0


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


Piezo test


Test piezo


Bead Pull Perturbation ( by Zhai Jiyuan)


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):


Ball disturbing

phase error

#9 cell

#1 cell


ball disturbing cell #9 ~50KHZ 300 cell #1 ~10KHZ 100

ball speed=3mm/s

#1 cell

#1 cell

#9 cell


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

tuner FB on

Disturbing off

FB off

#1 cell


Piezo actuator


Piezo On (sine、 sawtooth 、 rectangle)

piezo 200V --8um --1.2KHz

phase error

piezo off


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


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


Digital LLRF is under adjusting

Dr.Qiu Feng

Ms.Lin Haiying


Next year plan

  • 80K LN2 →MHI-04 for test Tuner mechanic performance

    1) vacuum tank

    2) motor

  • CW→pulse mode for LLRF loops


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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