development of dielectric pets chunguang jing and wei gai anl and euclid clic workshop 2013
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Development of Dielectric PETS
Chunguang Jing and Wei Gai
ANL and Euclid
CLIC workshop 2013
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Dielectric-lined Waveguide to Slow the Wave
Electric Field Vectors (TM01)
• Advantages: simplicity of fabrication
low surface field enhancement
easy deflecting mode damping
• Challenges: Multipactor
Er/Ez=a/
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Using CLIC Beam: σz=1mm, Q=8.4nC, Tb=83ps
Freq 11.994GHz
Effective Length 23cm
Beam channel 23mm
Dielectric wall thickness 2.582mm
Dielectric const. 3.75(Quartz)
Q 7318
R/Q 2.171k/m
Vg 0.4846c
Peak surface Gradient Ell=12.65MV/m; E=18.28MV/m
Steady Power 142MW
Dielectric PETS Parameters
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Engineering Design RF output coupler
Impedance matching section
Dielectric loaded waveguide
Transverse mode damping
Quartz tube
metalization
SiC tube
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Current Status
• quartz tube and damping features are in hand.• copper parts and coupler are under fabrication.• final assembly will be done by the middle of Feb. 2013.
Quartz tube
Brazed copper ring
w/ 3 section of damper
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11.4GHz version is under high power rf test at SLAC
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Setup at SLAC ASTA facility
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Testing data on 1/25/2013
Power: 16MW
Vacuum deceases as power stay at a certain level for a while.
Test plan: 50ns to full power first; then gradually increases the pulse length to 200ns.
Torr
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Testing data on 1/28/2013
Power: 24MW
Vacuum deceases as power stay at a certain level for a while.
Torr
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we would like to get an opportunity to conduct the beam experiment of 12GHz Dielectric PETS at CLIC.
Thank you!
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Introduction--- AWA Facility in 2013: 75 MeV Drive Beam+ 15MeV witness beamBasic parameters for the drive beam:• 1.3GHz Photogun w/ CsTe cathode• 75 MeV, 1 – 100 nC (reached 150 nC)• 1~2.5 mm bunch length (a bunch compressor is
planned )• Normalized emittance < 200 mm mrad (at 100 nC)• Bunch train operation: 32 X 30nC or 10 X 100nC• Beam power: 3GW or 10GW
Experiments forecast in 5 years:• High power rf generation: 0.1~1GW, ~20ns duration, frequency covers cm to mm wave.• Two beam acceleration: >200MeV/m energy gain (short rf pulse, ~20ns).• Collinear wakefield acceleration: >300MeV/m energy gain.• Bunch shaping to improve efficiency for collinear wakefield acceleration
New drive gun w/ CsTe cathode
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Thanks to DoE for $2M+ upgrade fund:• 2 new klystrons • 6 linac tanks• RF distribution and Control systems upgrade• Laser upgrade
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Klystrons Stations 6 Linacs are ready for use New KrF UV amplifier
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Thanks to ANL management for $2M+ construction fund:• new annex building• new SF6 recovery system• new cooling water station• new 1MW power transformer
Bunker Interior New annex building Roof of the new bunker
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AWA Facility update: