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Accelerator R&D on LC - Activities of ATF & STF -

Accelerator R&D on LC - Activities of ATF & STF -. Introduction ATF STF Summary. Seiya Yamaguchi, KEK The US/Japan Collaboration in High Energy Physics The 30th Anniversary Symposium, Oct. 20-21, 2010. 1. Introduction. STF. for superconducting acceleration. ATF.

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Accelerator R&D on LC - Activities of ATF & STF -

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  1. Accelerator R&D on LC - Activities of ATF & STF - Introduction ATF STF Summary Seiya Yamaguchi, KEK The US/Japan Collaboration in High Energy Physics The 30th Anniversary Symposium, Oct. 20-21, 2010

  2. 1. Introduction STF for superconducting acceleration ATF for precise beam generation, control

  3. 2. ATF 1995 Linac completed 1997 Ring completed 2002 RF Gun installed 2008 ATF2 completed

  4. IP-BSM (KEK, U. Tokyo, SLAC, UK) signal pattern of Compton g pattern depends on beam size FFTB Shintake BSM (1994) Significantly improved 1,064 nm → 532 nm sy=70 nm → 35 nm sy=310±30(stat.)+0-40(sys) nm(July, 2010)

  5. Fast Kicker (KEK, SLAC) • KEK to develop strip-line electrode. • rise/fall time less than 3 ns. • US team (SLAC) to develop • high-speed pulsed power • supplies. (10 kV) • Tested at ATF DR since 2009. • Extracted 30 bunches from DR. Jun.10 Tr~2.2 ns

  6. Cavity BPM for use at IP (KEK) • Create a reference at IP instead of colliding beam • Need 2 nm resolution • Rectangular cavity → X-Y separation • Achieved resolution 8.7 nm ±0.28(sta.)±0.35(sys), • dynamic range ~ 5 μm • Temperature stabilization, high bunch intensity and beam orbit • stabilization are necessary to improve the resolution.

  7. Fast Feedback (KEK, SLAC) (FONT : Feedback On Nanosecond Time scale) • Feedback and Feed forward will be used to straighten the train. • FONT : latency estimate • - irreducible latency=14 ns • - electronics latency=118 ns • - total latency of FB loop • =132 ns < 154 ns Bunch spacing=154 ns FB OFF FB ON

  8. 3. STF • Improve performance of • superconducting cavity - high gradient - high Q-value • Demonstrate superconducting Accelerator System • - SC cavity • RF source • Cryo system • e- gun • Monitor • etc.

  9. High Gradient SC Cavity Development • S1-Global at KEK • VT at JLAB • - demonstrate plug compatibility • operate at 31.5 MV/m • two cavities from FNAL, two from • DESY KEK supplies 4 cavities - KEK cavity tested at JLAB 27 MV/m at JLAB 12 MV/m at KEK • assembly completed, RF test in CM • on going.

  10. Camera for observation of inner surface(KEK, Kyoto U, FNAL, JLAB) • To find defect, contamination in cavity • FNAL introduced the inspection camera. • KEK loaned the camera to JLAB for 1 • year. • Improvement of the camera for more • bright image and high resolution defect FNAL JLAB

  11. Pre-tuning machine for 9-cell cavity • SC : deep drawing • → deform cavity shape • FNAL-DESY-KEK collaboration • Hardware and Software fabrication • are complete. • Training course at FNAL on Feb. • 2010. • Delivered to KEK Sep. 2010. training at FNAL (Feb 2010) Delivered to at KEK (Sep.2010)

  12. Production of ultra-low emittance beamDevelopment of RF gun • Fabrication of 1.3 GHz photocathode RF gun by FNAL-KEK, based • on DESY design. • RF cavity, Input coupler (FNAL). • Photocathode and solenoid fabricated (KEK). • Beam test in 2011 at STF (KEK).

  13. 4. Summary • Established many advanced accelerator technologies for high quality beam and superconducting acceleration.

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