Stripline Kicker Project

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Stripline Kicker Project

• LBL
• LLNLSLAC
• KEK
• DESY

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• Damping Ring Injection / Extraction Kicker Magnet
• The TDR Kicker
• 0.6 mrad (.01Tm), 5GeV, 50 m ß, 7e-4 stability,
  20 each, many meters long (kicker achromat not
  possible)
• Counter-fed 50 ohm striplines
• The conventional approach (SLAC)
• Follow and extend the TDR design
• FET / Hard tube / Saturable Ferrite
• Alternatives
• Coherent sum CW standing wave kickers (system)
  Gollin / KEK
• Waveguide close to cut-off (system) Gollin /
  FNAL
• Pulsed traveling wave RF structures (system)
  INFN / Cornell
• Shorted-striplines (just the magnet) Wille
  (Dortmund) / SPEARIII
• (Hard tube-based pulsers Frisch)
• Consider the application of this technology at
  KEK-ATF

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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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DESY Kicker RD ITRP Poster (Obier)
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(read µ)
DESY Kicker RD 2 stripline magnets
built Ongoing RD for XFEL switchyard
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• ATF Kicker development. (2 programs)
• Program 1 Conventional pulse technology
  extremely fast kicker
• Extract 20 bunches spaced by 330 ns to be used
  for testing ILC instrumentation in the ATF
  extraction line
• Replace existing extraction kicker for test
• 25mm aperture, 20KV, 1.3m kicker is enough to
  extract (3mrad at 1.3GeV)
• (500A, 10MW peak)
• Six 200 mm long stripline pairs - 12 pulsers
  (/)
• Conventional solid state / planar triode pulser
  with many counter-fed striplines
• Roughly 2x harder than ILC
• Uses saturable ferrite shock-line technology
• Program 2 long pulse kicker for fast extraction
  based on epoxy magnet technology (SLAC DR, ATF
  injection)

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Plan

• Reduce required kick power 4x TDR power(?)
• 4 kickers ?
• 10 mm diameter ?
• DESY Behlke pulser basic unit is 10 ? each 20
  or 30 needed.
• Still expensive
• Vacuum chamber modifications will be more
  expensive
• Stripline kicker
• Needs a design and consensus esp between
  SLAC/KEK/DESY

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Kickoff meeting LBL 07.12.2004

• Caspers, Lambertson, Byrd
• More interesting ideas (based on p_bar
  cooling/ring feedback exp.)
• Slotted stripline slow speed
• Tapered stripline wider band
• Long, ceramic loaded line (?)
• This group should produce kicker design and cold
  test it

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Proposed project

• Goal
• Proof of 5 ns principle before 06.2005
• Extraction using 5ns full width 3MHz kicker by
  01.2007
• KEK/DESY/SLAC/LLNL pulser tests at KEK using
  existing stripline
• LBL low beam-impedance kicker
• KEK/SLAC ATF modifications and design

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