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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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slide1

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
1. Introduction

STF

for superconducting

acceleration

ATF

for precise beam generation, control

2 atf
2. ATF

1995 Linac completed 1997 Ring completed 2002 RF Gun installed 2008 ATF2 completed

slide4

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)

fast kicker kek slac
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

cavity bpm for use at ip kek
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.
fast feedback kek slac
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

3 stf
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.
high gradient sc cavity development
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.
camera for observation of inner surface kek kyoto u fnal jlab
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

pre tuning machine for 9 cell cavity
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)

production of ultra low emittance beam development of rf gun
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).
4 summary
4. Summary
  • Established many advanced accelerator

technologies for high quality beam and

superconducting acceleration.