C-band Accelerator system for XFEL / SPring-8 C. Kondo, T. Inagaki, T. Shintake for XFEL project in...
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Transcript of C-band Accelerator system for XFEL / SPring-8 C. Kondo, T. Inagaki, T. Shintake for XFEL project in...
![Page 1: C-band Accelerator system for XFEL / SPring-8 C. Kondo, T. Inagaki, T. Shintake for XFEL project in SPring-8 6/Oct/2008 Seminar at SLAC ckondo@spring8.or.jp.](https://reader036.fdocuments.net/reader036/viewer/2022081519/56649e2c5503460f94b1b4e9/html5/thumbnails/1.jpg)
C-band Accelerator systemfor XFEL / SPring-8
C. Kondo, T. Inagaki, T. Shintake
for XFEL project in SPring-8
6/Oct/2008Seminar at SLAC
[email protected]@spring8.or.jp
![Page 2: C-band Accelerator system for XFEL / SPring-8 C. Kondo, T. Inagaki, T. Shintake for XFEL project in SPring-8 6/Oct/2008 Seminar at SLAC ckondo@spring8.or.jp.](https://reader036.fdocuments.net/reader036/viewer/2022081519/56649e2c5503460f94b1b4e9/html5/thumbnails/2.jpg)
8 GeV XFEL Machine Layout
InjectorS-band4 units C-band (42 off-crest) 12 units
C-band (crest) 52 units
Undulators
30 MeV100 A
500 keV1 A x 1 ns
1.4 GeV3 kA
8 GeV3 kA
400 MeV1 kA
Bunch compression
Acceleration
X-ray Lasermin < 0.1 nm
Ea = 35 MV/m
V/V ~ 0.01%rms
~ 0.2 deg.rms
V/V ~ 0.01%rms
~ 0.5 deg.rms
![Page 3: C-band Accelerator system for XFEL / SPring-8 C. Kondo, T. Inagaki, T. Shintake for XFEL project in SPring-8 6/Oct/2008 Seminar at SLAC ckondo@spring8.or.jp.](https://reader036.fdocuments.net/reader036/viewer/2022081519/56649e2c5503460f94b1b4e9/html5/thumbnails/3.jpg)
C-band (5712 MHz) RF system
HV Charger HV Charger
![Page 4: C-band Accelerator system for XFEL / SPring-8 C. Kondo, T. Inagaki, T. Shintake for XFEL project in SPring-8 6/Oct/2008 Seminar at SLAC ckondo@spring8.or.jp.](https://reader036.fdocuments.net/reader036/viewer/2022081519/56649e2c5503460f94b1b4e9/html5/thumbnails/4.jpg)
Pulse-to-pulse jitter from the klystron voltage
HV Charger
AC 420 V
XFEL requires (rms) - Intensity 0.01% - Phase 0.2 °
Modulator
Charging 50 kV
Klystron
Pulse -350 kV
Pulse Comp.
RF 50 MW
RF 70 MW 2
Accel. Struct.
0.01 %
0.01 %high precision HV charger with <0.01% (100 ppm) stability
![Page 5: C-band Accelerator system for XFEL / SPring-8 C. Kondo, T. Inagaki, T. Shintake for XFEL project in SPring-8 6/Oct/2008 Seminar at SLAC ckondo@spring8.or.jp.](https://reader036.fdocuments.net/reader036/viewer/2022081519/56649e2c5503460f94b1b4e9/html5/thumbnails/5.jpg)
Improvement of High Voltage Charger
Specification:・ Switching device IGBT・ Charging voltage Max. 50 kV・ Charging current ~ 2 A・ Average output power 36 kW・ Repetition 60 Hz・ Voltage stability (jitter) 0.01 %rms
Aug. 2006, Nichicon Corp.Used at prototype acc.
Feb. 2008, Nichicon Corp.
Nov. 2007, Toshiba electro-wave,
![Page 6: C-band Accelerator system for XFEL / SPring-8 C. Kondo, T. Inagaki, T. Shintake for XFEL project in SPring-8 6/Oct/2008 Seminar at SLAC ckondo@spring8.or.jp.](https://reader036.fdocuments.net/reader036/viewer/2022081519/56649e2c5503460f94b1b4e9/html5/thumbnails/6.jpg)
Block Diagram of HV Charger
Full-wave rectification
AC420 V
Full bridgeswitching
Main
Sub
ResonanceHigh voltagerectification
DC600 V
Max. 50 kV
We use Main charger and Sub charger.“Main” charges 99.5%, fast but roughly“Sub” charges up to the target voltage, slowly but accurately.
![Page 7: C-band Accelerator system for XFEL / SPring-8 C. Kondo, T. Inagaki, T. Shintake for XFEL project in SPring-8 6/Oct/2008 Seminar at SLAC ckondo@spring8.or.jp.](https://reader036.fdocuments.net/reader036/viewer/2022081519/56649e2c5503460f94b1b4e9/html5/thumbnails/7.jpg)
Feedback Control of Charged Voltage
HV charger Modulator
PFN Capacitors
HV probeJapan finechem inc. 2007
Feedback of the voltage
Error amp.
Reference voltage
Stray capacitance delays the responseMain resistor : 1 G→100 M・ Time constant: 1 msec→100 sec・ Heat loss: Fluorinert, Cooling water.
![Page 8: C-band Accelerator system for XFEL / SPring-8 C. Kondo, T. Inagaki, T. Shintake for XFEL project in SPring-8 6/Oct/2008 Seminar at SLAC ckondo@spring8.or.jp.](https://reader036.fdocuments.net/reader036/viewer/2022081519/56649e2c5503460f94b1b4e9/html5/thumbnails/8.jpg)
New HV charger with 10 ppm (rms) stability
Prototype modelFeb. 2008, Nichicon Corp.
This stability satisfies the requirement at XFEL (<100 ppm).
Typical HV charging cycle(Tens of waveforms are overlaid)
![Page 9: C-band Accelerator system for XFEL / SPring-8 C. Kondo, T. Inagaki, T. Shintake for XFEL project in SPring-8 6/Oct/2008 Seminar at SLAC ckondo@spring8.or.jp.](https://reader036.fdocuments.net/reader036/viewer/2022081519/56649e2c5503460f94b1b4e9/html5/thumbnails/9.jpg)
C-band (5712 MHz) RF system
Compact “all-in-one” modulator Compact “all-in-one” modulator
![Page 10: C-band Accelerator system for XFEL / SPring-8 C. Kondo, T. Inagaki, T. Shintake for XFEL project in SPring-8 6/Oct/2008 Seminar at SLAC ckondo@spring8.or.jp.](https://reader036.fdocuments.net/reader036/viewer/2022081519/56649e2c5503460f94b1b4e9/html5/thumbnails/10.jpg)
“New” modulatorOne tank including the pulse transformer and modulator
Pulse Transformer
PFN circuitCapacitor x16
(General Atomics)
Thyratrone2v CX-1836
EOL circuitDiode & Resistor
Klystroncathode
Nihon Koshuha Co. Ltd., Oct./2007Compact size: 1.7m x 1m x 1.2m, EM noise shielding, etc.
![Page 11: C-band Accelerator system for XFEL / SPring-8 C. Kondo, T. Inagaki, T. Shintake for XFEL project in SPring-8 6/Oct/2008 Seminar at SLAC ckondo@spring8.or.jp.](https://reader036.fdocuments.net/reader036/viewer/2022081519/56649e2c5503460f94b1b4e9/html5/thumbnails/11.jpg)
Thyratron and PFN Circuit (Detail)
Thyratron e2v, CX-1836・ Deuterium filled・ Impregnated cathode・ Double gap, twin trigger
・ Cooled by natural oil flow Omit forced oil flow.
Pulse Forming Network circuit ZPFN = 4 ・ Capacitor : General Atomics, Max. 50 kV 0.029 F ×16 series・ Coil 0.6 H ×16 series
Replace
Other circuit EOL, tail clipper, shunt diode, discharging resistor, etc
![Page 12: C-band Accelerator system for XFEL / SPring-8 C. Kondo, T. Inagaki, T. Shintake for XFEL project in SPring-8 6/Oct/2008 Seminar at SLAC ckondo@spring8.or.jp.](https://reader036.fdocuments.net/reader036/viewer/2022081519/56649e2c5503460f94b1b4e9/html5/thumbnails/12.jpg)
Pulse Transformer (detail)
RISHO Co. (Japan)
Turn ratio: 1:16 ( Prim=6 turn 、 Sec=96 turn )Primary voltage: -22 kVSecondary voltage: -350 KV
Epoxy-molded winding ・ High voltage insulation ・ Suppression of wire vibration
![Page 13: C-band Accelerator system for XFEL / SPring-8 C. Kondo, T. Inagaki, T. Shintake for XFEL project in SPring-8 6/Oct/2008 Seminar at SLAC ckondo@spring8.or.jp.](https://reader036.fdocuments.net/reader036/viewer/2022081519/56649e2c5503460f94b1b4e9/html5/thumbnails/13.jpg)
Oil cooling system of the modulator
• Concept• Fan-less cooling for viscous insulation oil• Low cost, Compact
• Requirements• Heat generation: ~3kW
• Heater ~1kW ( thyratron cathode, Klystron cathode)• Current loss ~2kW @ 45kV,60pps ( EOL, thy. Anode, Core Loss,
etc)
• Oil temperature : < 45 ℃• We measured the practical heat transfer coefficient
by model tank.• And, we designed the optimum cooling system for the
modulator.
![Page 14: C-band Accelerator system for XFEL / SPring-8 C. Kondo, T. Inagaki, T. Shintake for XFEL project in SPring-8 6/Oct/2008 Seminar at SLAC ckondo@spring8.or.jp.](https://reader036.fdocuments.net/reader036/viewer/2022081519/56649e2c5503460f94b1b4e9/html5/thumbnails/14.jpg)
View of Cooling system
2 panel type on partition wall
Cooling panel
1 pipe type on top board
Cooling pipe
2 panel type on side board
Cooling panel (side board)
![Page 15: C-band Accelerator system for XFEL / SPring-8 C. Kondo, T. Inagaki, T. Shintake for XFEL project in SPring-8 6/Oct/2008 Seminar at SLAC ckondo@spring8.or.jp.](https://reader036.fdocuments.net/reader036/viewer/2022081519/56649e2c5503460f94b1b4e9/html5/thumbnails/15.jpg)
Oil temperature
Oil temperature on nominal operation
Operation: 45 kV charging 60 ppsCooling water: 26 ℃, 8 L/min
Oil temperature: < 43 ℃
Oil
Te
mp
era
ture
(℃
)
![Page 16: C-band Accelerator system for XFEL / SPring-8 C. Kondo, T. Inagaki, T. Shintake for XFEL project in SPring-8 6/Oct/2008 Seminar at SLAC ckondo@spring8.or.jp.](https://reader036.fdocuments.net/reader036/viewer/2022081519/56649e2c5503460f94b1b4e9/html5/thumbnails/16.jpg)
C-band (5712 MHz) RF system
C-band Klystron C-band Klystron
![Page 17: C-band Accelerator system for XFEL / SPring-8 C. Kondo, T. Inagaki, T. Shintake for XFEL project in SPring-8 6/Oct/2008 Seminar at SLAC ckondo@spring8.or.jp.](https://reader036.fdocuments.net/reader036/viewer/2022081519/56649e2c5503460f94b1b4e9/html5/thumbnails/17.jpg)
50MW pulse klystron
Output power : 50 MW
Frequency: 5712 MHz
RF pulse width: 2.5 sec
Beam Voltage: -350 kV
Beam Current: 310 A
Repetition: 60 pps
TOSHIBA ELECTRON TUBES & DEVICES CO.LTD.
Model No. E37202
In the test accelerator, no trouble for 3,000 hours
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C-band (5712 MHz) RF system
Pulse compressorPulse compressor
C-band accelerator structureC-band accelerator structure
![Page 19: C-band Accelerator system for XFEL / SPring-8 C. Kondo, T. Inagaki, T. Shintake for XFEL project in SPring-8 6/Oct/2008 Seminar at SLAC ckondo@spring8.or.jp.](https://reader036.fdocuments.net/reader036/viewer/2022081519/56649e2c5503460f94b1b4e9/html5/thumbnails/19.jpg)
RF pulse compressorFabricated by Mitsubishi
Heavy Industries Ltd.
High-Q cavities mode: TE0,1,15
Q0 : 190,000 : 9.5
Mode converters (Shintake 1996) - Waveguide(TE10) Circular(TE0,1,x) - 4 coupling holes Lower rf field at the coupling hole
Input
50 MW
2.5 s
200 MW peak
0.5 s
Output
Directional coupler
![Page 20: C-band Accelerator system for XFEL / SPring-8 C. Kondo, T. Inagaki, T. Shintake for XFEL project in SPring-8 6/Oct/2008 Seminar at SLAC ckondo@spring8.or.jp.](https://reader036.fdocuments.net/reader036/viewer/2022081519/56649e2c5503460f94b1b4e9/html5/thumbnails/20.jpg)
Accelerating structure(Shintake structure)
Choke mode cavity (Shintake 1992) - traps the accel. mode (5712 MHz) - eliminate HOM (not 5712 MHz)
multi-bunch operation
High acceleration gradient R~ 54 M/m, ~ 0.53, L=1.8 m Ea = 35 MV/m with 63 MW x 300 nsec rf power
Fabricated by Mitsubishi Heavy Industries Ltd.
19.7
SiC absorber
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Mass production of the accelerating structure@ Mitsubishi Heavy Industries Ltd.
Precise lathe
Shipping
Dr. Miura(Mitsubishi)
Cells
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High power rf test bunker (July 2008 ~)
Accel. struct. Waveguide RF pulse compressor Modulator Klystron
In order to check quality of the delivered components, we constructed the test bunker. Now, rf processing is in progress.
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Modulator development team
白澤近藤櫻井
稲垣武部
新竹
T. Inagaki
C. Kondo
T. Shintake
S. Indo
K. Nakajima
T. Sakurai K. Shirasawa
![Page 24: C-band Accelerator system for XFEL / SPring-8 C. Kondo, T. Inagaki, T. Shintake for XFEL project in SPring-8 6/Oct/2008 Seminar at SLAC ckondo@spring8.or.jp.](https://reader036.fdocuments.net/reader036/viewer/2022081519/56649e2c5503460f94b1b4e9/html5/thumbnails/24.jpg)
Summary
Highly precise charger • Parallel charging system• New HV probe of fast response-time.• Stability of charging voltage ~10 ppm (rms)
New “all-in-one” modulator power supply• Compact oil-filled power supply.• EM noise shielding, fan-less oil-cooling system …• No trouble operation for 700 hours
Schedule• High power rf components were delivered on schedule.• Quality will be checked at the rf test bunker.• 2009~2010 installation• 2011~ Beam commissioning
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Thank You!