Title : High gradient Linac Name: Hitoshi Hayano Institutions: KEK, FNAL, SLAC

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Title High gradient Linac Name Hitoshi
HayanoInstitutions KEK, FNAL, SLAC
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Outline

• The accelerator developments of Electron Positron
  Linear Collider which has the center-of-mass
  energy 0.5 1 TeV are required for the following
  important items
•  
• 1. Developments of superconducting cavity
• (a) fabrication of 1.3GHz 9-cell cavity
• (b) surface treatment of cavity
• (c) cost reduction of cavity production
• 2. Construction of the test facility for
  superconducting linear accelerator (STF)
• (a) assembly of cryomodule and fabrication of
  proto-type superconducting magnet
• (b) installation of RF power source
• (c) development of beam instrumentation and
  control
• 3. ILC accelerator design

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Purpose

• To promote the developments of the
  superconducting accelerator technology for ILC,
  this research is focused on the development of
  the following items
•  
• 1. Developments of superconducting cavity
• (a) fabrication of 1.3GHz 9-cell cavity
• (b) surface treatment of cavity
• (c) cost reduction of cavity production
• 2. Construction of the test facility for
  superconducting linear accelerator (STF)
• (a) assembly of cryomodule and fabrication of
  proto-type superconducting magnet
• (b) installation of RF power source
• (c) development of beam instrumentation and
  control
• 3. Design of ILC accelerator
• (a) project management software
• (b) computers for document management

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Method

• 1. Developments of superconducting cavity
• (a) fabrication of 1.3GHz 9-cell cavity install
  tuners and helium jackets, and put 8 of them into
  two 6m cryostats.
• (b) surface treatment of cavity study of EP
  performance using single cell cavities and 9 cell
  cavities.
• (c) cost reduction of cavity production study
  on the fabrication of 3 cell hydro-formed cavity
• 2. Construction of the test facility for
  superconducting linear accelerator (STF)
• (a) assembly of cryomodule and fabrication of
  proto-type superconducting magnet
• (b) installation of RF power source fabrication
  of a new klystron modulator and pulse trans
• (c) development of beam instrumentation and
  control installation of electron gun and beam
  monitors
• 3. Design of ILC accelerator
• (a) installation of project management
  software
• (b) procurement of computers for document
  management

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Contribution of Japan and U.S.

• 1. Developments of superconducting cavity
• (a) fabrication of 1.3GHz 9-cell cavity install
  tuners and helium jackets, and put 8 of them into
  two 6m cryostats. (Japan)
• (b) surface treatment of cavity study of EP
  performance using single cell cavities and 9 cell
  cavities. (Japan and US)
• (c) cost reduction of cavity production study
  on the fabrication of 3 cell hydro-formed cavity
  (Japan)
• 2. Construction of the test facility for
  superconducting linear accelerator (STF)
• (a) assembly of cryomodule and fabrication of
  proto-type superconducting magnet (Japan)
• (b) installation of RF power source fabrication
  of a new klystron modulator and pulse trans
  (Japan)
• (c) development of beam instrumentation and
  control installation of electron gun and beam
  monitors (Japan and US)
• 3. Design of ILC accelerator
• (a) installation of project management
  software (US and Japan)
• (b) procurement of computers for document
  management (Japan)

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State of Implementation

• 1. Developments of superconducting cavity
• (a) fabrication of 1.3GHz 9-cell cavity two 9
  cell cavities were assembled into two cryostats.
• (b) surface treatment of cavity Eight 1 cell
  cavities and eight 9 cell cavities were used for
  the EP treatment study.
• (c) cost reduction of cavity production 3 cell
  hydro-forming machine was introduced and tested
  by copper cavity.
• 2. Construction of the test facility for
  superconducting linear accelerator (STF)
• (a) assembly of cryomodule and fabrication of
  proto-type superconducting magnet two 9 cell
  cavities were assembled into two cryostats.
• (b) installation of RF power source fabrication
  of a new klystron modulator and pulse trans
  Modulator and pulse trans were procured.
• (c) development of beam instrumentation and
  control installation of electron gun and beam
  monitors design of RFgun and beam monitor were
  done. beam line chambers were procured.
• 3. Design of ILC accelerator
• (a) installation of project management
  software did not introduced.
• (b) procurement of computers for document
  management did not introduced.

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Research Highlight

• 1 TESLA-shape cavity and 1 LL-shape cavity were
  installed into 6m cryostat each.
• Average 46.7MV/m gradient in 1 cell LL cavities
• Bouncer modulator procurement

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Future Prospects

• Superconducting accelerator technology are the
  key technology for future high beam power
  accelerators. To invest into the infra-structure
  of this technology is essential for the next
  physics project using accelerators.
• Accelerator gradient is increasing by the effort
  of the surface treatment technology development.
• Cryomodule technology is well established by this
  research in Japan. It will be more widely applied
  to other accelerators.

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Number of Participants

( )Graduate Students
10
Number of Persons Acquiring Doctor Degree from
FY1979 to FY2007
( )from FY2003 to FY2007
11
Number of Presentations from FY1979 to FY2007
FY2006 only
( )from FY2003 to FY2007
12
Number of Academic Dissertationfrom FY2003 to
FY2007
13
Number of Citations from FY1979 to FY2007 (Only
Referee Reading)
( )from FY2003 to FY2007
14
Research Papers Cited over 100 Times
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Other Important Research Papers (within five
titles)

• CRYOMODULE DEVELOPMENT FOR SUPERCONDUCTING RF
  TEST FACILITY (STF) AT KEK, K. Tsuchiya, et.
  al., Proc. of EPAC2006, Edinburgh, Scotland,
  (2006)
• STATUS OF RF SOURCES IN SUPER-CONDUCTING RF TEST
  FACILITY (STF) AT KEK, S. Fukuda, et. al., Proc.
  of LINAC2006, Knoxville, USA, (2006)
• LOW-LEVEL RF SYSTEM FOR STF, T. Matsumoto, et.
  al., Proc. of LINAC2006, Knoxville, USA, (2006)
• INITIAL STUDIES OF 9-CELL HIGH-GRADIENT
  SUPERCONDUCTING CAVITIES AT KEK, T. Saeki, et.
  al., Proc. of LINAC2006, Knoxville, USA, (2006)
• CONSTRUCTION OF THE BASELINE SC CAVITY
  SYSTEM FOR STF AT KEK, E. Kako, et. al.,
  Proc. of PAC07, Albuquerque, USA, (2007)