High duty cycle RF Power Couplers. Sergey Belomestnykh (Cornell University)

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2. Introduction
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3. Talk outline
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5. Primary functions
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Pforw
Pbeam
Prefl
Generator Transmission line Coupler Cavity Beam
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6. Other requirements/challenges
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7. Coupler options
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8. Coupler port location
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9. CW couplers
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LEP2 / SOLEIL 352 MHz Coax fixed Cylindrical 2 106 Test: 565 kW Traveling wave
@ Γ=0.6
380 kW
Operation: 150 kW
LHC 400 MHz Coax variable (60 Cylindrical 2 104 to Test: 500 kW Traveling wave
mm stroke) 3.5 105 300 kW Standing wave
HERA 500 MHz Coax fixed Cylindrical 1.3 105 Test: 300 kW Traveling wave
Operation: 65 kW
CESR 500 MHz WG fixed WG, 3 disks 2 105 Test: 250 kW Traveling wave
(Beam test) 125 kW Standing wave
Operation: 155 kW Beam test
CESR / 3rd 500 MHz WG fixed WG disk 2 105 Test: 450 kW Traveling wave
generation light Operation: 300 kW
sources 360 kW Forward power
TRISTAN / KEKB 509 MHz Coax fixed Disk, coax 7 104 Test: 800 kW Traveling wave
/ BEPC-II 300 kW Standing wave
Operation: 400 kW
APT 700 MHz Coax variable Disk, coax 2 105 to Test: 1 MW Traveling wave
( 5 mm stroke) 6 105 850 kW Standing wave
Cornell ERL 1300 MHz Coax variable Cylindrical 9 104 to Test: 61 kW Traveling wave
injector / ERL (>15 mm stroke) (cold and warm) 8 105
cryomodule collab.
Very low ∆T
JLAB FEL 1500 MHz WG fixed WG planar 2 106 Test: 50 kW
Operation: 35 kW
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10. Pulsed couplers
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CARE-HIPPI 704 MHz Coax fixed Disk, coax - Test: 1 MW 2.0 msec, 50 Hz
SNS 805 MHz Coax fixed Disk, coax 7 105 Test: 2 MW 1.3 msec, 60 Hz
Operation: 550 kW 1.3 msec, 60 Hz
J-PARC 972 MHz Coax fixed Disk, coax 5 105 Test: 2.2 MW 0.6 msec, 25 Hz
370 kW 3.0 msec, 25 Hz
FLASH 1300 MHz Coax variable Conical (cold), 1 106 to Test: 250 kW 1.3 msec, 10 Hz
(FNAL) WG planar (warm) 1 107 Operation: 250 kW 800 usec, 10 Hz
FLASH 1300 MHz Coax variable Cylindrical (cold), 1 106 to Test: 1 MW* 1.3 msec, 2 Hz
(TTF-II) WG planar (warm) 1 107 Operation: 250 kW 1.3 msec, 10 Hz
FLASH / XFEL / 1300 MHz Coax variable Cylindrical 1 106 to Test: 1 MW 1.3 msec, 2 Hz
ILC (TTF-III) (cold and warm) 1 107 Operation: 250 kW 1.3 msec, 10 Hz
KEK STF 1300 MHz Coax fixed Disks, coax 2 106 Test: 1.9 MW 10 usec, 5 Hz
(baseline ILC) (cold and warm) 1 MW 1.5 msec, 5 Hz
KEK STF 1300 MHz Coax fixed Disk (cold), 2×106 Test: 2 MW 1.5 msec, 3 Hz
(capacitively coupled) cylindrical (warm) 1 MW 1.5 msec, 5 Hz
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11. TTF-III / XFEL coupler
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12. Cornell ERL injector input coupler
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13. TRISTAN / KEKB coupler
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Biased doorknob ( 2 kV)
Alumina (99.5%) coaxial disk
window, coated with 100 Å of
TiNxO1-x , air cooled outside
Copper plated SS,
4 K He gas cooling at 8 l/min
Water cooled inner conductor,
electropolished copper
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14. SNS coupler
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15. SNS couplers: operational
experience
400 20
Cav_Fw d_pow er
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350 Eacc
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300
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Forward Power (kW)
250
12
Eacc (MV/m)
200 10
8
150
6
100
4
50
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Cavity num ber
10b; disabled (noisy filed probe signal) CM19
11b; disabled Removed
(large fundamental mode coupling thru HOM coupler) for HOM coupler repair
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16. CARE-HIPPI coupler
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17. CARE-HIPPI coupler (2)
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18. CARE-HIPPI coupler (3)
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19. Input couplers summary
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21. Need for HOM dampers
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22. HOM damper types
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23. Beam pipe absorbers; KEKB
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24. Cornell beam pipe absorbers
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25. XFEL beam pipe absorber
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26. Rectangular waveguide HOM couplers
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27. Radial line HOM coupler
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28. Loop HOM coupler
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29. LEP/LHC couplers
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30. SOLEIL/Super-3HC couplers
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through the SOLEIL module
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31. TESLA HOM couplers
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32. “Bumps in the road”
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33. SNS experience
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34. SNS experience (2)
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35. Loop HOM coupler for RHIC 56 MHz
SC cavity at BNL
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36. HOM dampers summary
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37. Acknowledgements
I would like to thank
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who provided new information for this presentation
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many others from whose papers/slides
I borrowed materials
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