Development of Dielectric PETS Chunguang Jing and Wei Gai ANL and Euclid CLIC workshop 2013.

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Presentation transcript:

Development of Dielectric PETS Chunguang Jing and Wei Gai ANL and Euclid CLIC workshop 2013

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 E r /E z =  a/

3 Using CLIC Beam: σz=1mm, Q=8.4nC, Tb=83ps Freq11.994GHz Effective Length23cm Beam channel23mm Dielectric wall thickness2.582mm Dielectric const.3.75(Quartz) Q7318 R/Q 2.171k  /m Vg0.4846c Peak surface GradientE ll =12.65MV/m; E  =18.28MV/m Steady Power142MW Dielectric PETS Parameters

4 Engineering Design RF output coupler Impedance matching section Dielectric loaded waveguide Transverse mode damping Quartz tube metalization SiC tube

5 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 Quartz tube Brazed copper ring w/ 3 section of damper

6 11.4GHz version is under high power rf test at SLAC 6 Setup at SLAC ASTA facility

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

Testing data on 1/28/2013 Power: 24MW Vacuum deceases as power stay at a certain level for a while. Torr

we would like to get an opportunity to conduct the beam experiment of 12GHz Dielectric PETS at CLIC. 9

10 Introduction--- AWA Facility in 2013: 75 MeV Drive Beam+ 15MeV witness beam Basic 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

Thanks to DoE for $2M+ upgrade fund: 2 new klystrons 6 linac tanks RF distribution and Control systems upgrade Laser upgrade 11 Klystrons Stations 6 Linacs are ready for use New KrF UV amplifier

12 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

AWA Facility update: 13