tuner & llrf of ilc sun yi (孙毅)、 wang guangwei (王光伟) lin haiying...
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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
Bandwidth 220KHzQL=5897
8/9∏-mode influence
phase
Z
-3dB f(MHz)
VSWR=6.0
βin=0.17
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
ball disturbing cell #9 ~50KHZ 300 cell #1 ~10KHZ 100
55
5 6mm mm
Tuner FB on under disturbing of cell #1 ~10KHZ 100
ball speed = 0.3mm/s
Piezo actuator
Piezo On (sine 、 sawtooth 、 rectangle)
Piezo=200V 0.1HZ rectangle & sinemeasured by grating rule: 2.5um
Piezo=300V 0.1HZ sine & rectangle
Piezo300V→12um
Measured by grating rule→6.5umWhy ?
0.60←1.5kHz
f
Digital LLRF is under adjusting
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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