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Stripline Kicker Project

Stripline Kicker Project. LBL LLNL SLAC KEK DESY. Damping Ring Injection / Extraction Kicker Magnet The TDR Kicker: 0.6 mrad (.01Tm), 5GeV, 50 m β , 7e-4 stability, 20 each, many meters long (kicker ‘achromat’ not possible) Counter-fed 50 ohm striplines

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Stripline Kicker Project

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  1. Stripline Kicker Project LBL LLNLSLAC KEK DESY

  2. Damping Ring Injection / Extraction Kicker Magnet • The TDR Kicker: • 0.6 mrad (.01Tm), 5GeV, 50 m β, 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

  3. 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

  4. DESY Kicker RD ITRP Poster (Obier)

  5. (read µ) DESY Kicker RD – 2 stripline magnets built Ongoing RD for XFEL switchyard

  6. 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)

  7. Plan • Reduce required kick power – 4x TDR power(?) • 4 kickers ? • 10 mm diameter ? • DESY Behlke pulser ~basic unit is 10　万 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

  8. 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

  9. 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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