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Development of Dielectric PETS

This document discusses the development of Dielectric PETS (Power Extraction and Transfer Structures) for the CLIC (Compact Linear Collider) project. Key advantages include fabrication simplicity and efficient mode damping, alongside challenges such as multipactor effects. Technical parameters and recent testing at the SLAC facility are covered. Significant upgrades at the AWA facility enable future experiments, including high-power RF generation and novel beam acceleration techniques. Insights on current status and plans for further development in the next five years are shared.

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Development of Dielectric PETS

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

  2. Dielectric-lined Waveguide to Slow the Wave • Advantages: simplicity of fabrication • low surface field enhancement • easy deflecting mode damping • Challenges: Multipactor Er/Ez=a/ Electric Field Vectors (TM01)

  3. Dielectric PETS Parameters Using CLIC Beam: σz=1mm, Q=8.4nC, Tb=83ps

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

  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. 2013. w/ 3 section of damper Quartz tube Brazed copper ring

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

  7. Testing data on 1/25/2013 Test plan: 50ns to full power first; then gradually increases the pulse length to 200ns. Power: 16MW Torr Vacuum deceases as power stay at a certain level for a while.

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

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

  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 New drive gun w/ CsTe cathode • 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

  11. Thanks to DoE for $2M+ upgrade fund: • 2 new klystrons • 6 linac tanks • RF distribution and Control systems upgrade • Laser upgrade 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 Roof of the new bunker Bunker Interior New annex building

  13. AWA Facility update:

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