Multiple Beam Klystrons for Accelerators and Collider

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Multiple Beam Klystrons for Accelerators and
Collider

• Patrick Ferguson, Liqun Song, Lawrence Ives
• Calabazas Creek Research, Inc.
• 20937 Comer Drive
• Saratoga, CA 95070
• [phone]
• Patrick_at_CalCreek.com, RLIves_at_CalCreek.com
• www.CalCreek.com

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Calabazas Creek Research, Inc.

• Leader in development of high power RF sources
  and components for fusion and high energy physics
  research. Products used in Europe, Asia, and the
  United States. Founded in 1994.

10 MW, W-Band Gyroklystron
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Current Programs

• 50 MW X-Band Multiple Beam Klystron (MBK)
• 201 MHZ, 5 MW MBK
• 100 W, W-Band MEMS TWT
• Improved cathodes for magnetron injection guns
• X-Band, 100 MW Sheet Beam Gun
• Finite Element, Adaptive Mesh Particle-In-Cell
  Code
• Finite Element, Adaptive Mesh Trajectory Code
• High power windows and waveguide components

500 kV Electron Gun for the University of Maryland
Additional information at www.CalCreek.com
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Analytical Tools

• Gun and collector design 3D Beam Optics
  Analysis, 3D OmniTrak, 2D Trak, 2D EGUN
• Magnetics Maxwell 2D, Maxwell 3D
• Cavities Superfish, HFSS, MAFIA
• Circuit 21/2D KLSC, 3D MAGIC
• Thermal - ANYSYS

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X-Band MBK Program

• 50 MW, 11.424 GHz MBK for accelerator research

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Collector Design
Collector design requires 3D magnetics and 3D
beam simulations.
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5 MW, 201 MHz MBK for Tevatron

• Number of Beams 8
• Frequency 201 MHz
• Power 5 MW
• Efficiency gt55
• Gain 46 dB
• Must operate linearly 15 below saturation
• Must fit in space available

Funded by U.S. Department of Energy Small
Business Innovation Research Grants
DE-FG03-004ER83916
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Multiple Beam Fundamental Mode Cavity
Configuration
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Electron Gun Analysis
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Circuit Analysis(1)
Initial design of MBK circuit utilizes 2D MAGIC
and KLSC. Consistency is required. Final design
uses 3D MAGIC. All components cold tested before
and after assembly.
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Circuit Analysis(2)
Induced RF voltage in the output
3D MAGIC beam-RF Interaction
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Window Design
Window design performed with CCRs scattering
matrix code CASCADE. Thermomechanical analysis
uses ANSYS.
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Anticipated Configuration
Magnet coils
HV ceramic operates in air
Polepieces
Coaxial Output (2)
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10 MW, 201 MHz MBK for Tevatron
Number of Beams 8 Frequency 201
MHz Power 10 MW Efficiency gt55 Gain 46
dB Must operate linearly 15 below
saturation Must fit in space available
Funded by U.S. Department of Energy Small
Business Innovation Research Grants
DE-FG03-004ER83916
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Cost Trade-Offs

• Klystron configuration based on total system
  cost, including power supply.
• Diversified Technologies Inc. provided cost
  comparison for solid state power supplies
• Number of beams based on power supply costs, cost
  of the electron gun, and cost of the klystron
  circuit

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201 MHz MBK Status

• Phase I program successfully completed
• Phase II proposal due April 13, 2005
• Klystron and magnet would be built, tested, and
  delivered in the Phase II program to
• Fermi National Accelerator Laboratory

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DOE SBIR Solicitation

• Grant applications are sought for new approaches
  for RF amplifiers for use in future Muon
  Collider. The RF amplifiers must have high peak
  power (gt30 MW), 20 MHz (2 ms pulses) to 200 MHz
  (0.1 ms pulses). Higher power (gt100 MW) at higher
  frequencies (from 30 microsec. At 400 MHz to 10
  microsec. at 800 MHz) are also of interest. Pulse
  repetition rate compatibility 15 Hz.

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30 MW, 200 MHz MBK

• Configuration assumes 12 beams.Beam
  Voltage 115 kVCurrent 468
  AMicroperveance 12.0 (effective)Efficiency 55
  Circuit Length 2.96 meters

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100 MW, 800 MHz MBK

• Configuration assumes 8 beamsBeam Voltage 250
  kV (solid state supply)Current 752
  AMicroperveance 8.0 effectiveEfficiency gt55
  Gain 50 dBOutput Power 119 MWCircuit
  Length 2.98 meters
• Phase I SBIR proposal submitted to DOE in
  December 2004. Currently under review.

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Summary

• Multiple beam klystrons are currently being
  designed and built
• X-Band MBK design is complete, gun was
  successfully tested, and klystron is being
  assembled
• 201 MHz MBK initial design is complete. No
  significant problems are anticipated
• Technology and experience available to
  successfully design and build MBK at other
  frequencies and higher power levels