Stripline Kicker Project

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Stripline Kicker Project

• LBL
• LLNLSLAC
• KEK
• DESY

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Kicker RD

• Goals
• by Snowmass demonstrate 5 ns rise/fall time (at
  nominal TDR field) to show that the kicker
  should not be primary DR circumference
  consideration. (WG3)
• by 2007
• extract 3 MHz, 60 bunch ILC pulse train of
  nominal emittance bunches into ATF2 (WG4)
• Demonstrate functioning ILC extraction kicker
  system (WG3)

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Stripline kicker requirements

• TDR 100Gm, 10KV, 60 mm diameter
• tested 10G, 10KV (need 10 meter long magnet
  string!)
• ATF need 220Gm have much less space
• try 100G 20KV (4 x TDR power), 12 mm diameter
• need 2.2 meters (other things equal)
• Is this reasonable?

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Zero-th order solution

• Two sets of stripline kickers
• 0.8 m at the end of south straight section
  (ZH39R)
• 1.4 m at existing kicker location
• stronger QM6R.1 (not matched)
• Kicker strength
• 50 G for set 1)
• results in 7mm p/p oscillation on last pass
  through east arc
• 100 G for set 2)

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Stripline kicker pulsers

• need reverse fed, relatively short (300 mm)
  devices
• 8 magnets total with 8 or 16 pulsers, each
  roughly 4 times TDR pulser power
• simplest brute force stripline magnet design has
  2 pulsers/magnet /- polarity
• LLNL working on transformer to reduce to 1 pulser
  / magnet
• some cost in rise time?
• 8 x 4 32 TDR pulsers 80 K excluding support
  electronics
• DESY tested magnet had beam impedance coating
  needs checking

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Counter-fed Stripline (power fed parallel to beam
direction gives no kick unless v_g is low) Rise
time depends on travelling wave kicker fill time
DESY Kicker RD Rummler / Shiltsev / BINP
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Plan

• KEK/DESY/SLAC/LLNL pulser tests at KEK using
  existing stripline
• LBL low beam-impedance kicker geometrical /
  mechanical design
• KEK/SLAC ATF modifications and design