WP4-CHOPPER%20coordinated%20by%20A.%20Lombardi

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WP4-CHOPPERcoordinated by A. Lombardi

• HIPPI yearly meeting, sep28-sep30 2005
• COSENERS HOUSE- Abington
• Hosted by CCLRC

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General info

• Contributors
• RAL C. Prior, M. Clarke-Gayther, G. Bellodi, C.
  Plostinar
• CERN M. Paoluzzi , F. Caspers, M. Morvillo, L.
  Bruno, K. Hanke, E. Sargsyan, J.B. Lallement, M.
  Hori, A. Lombardi

• WEB site http//lombarda.home.cern.ch/lombarda/W
  P4/WP4main.htm

• Yearly meeting 13-15 april 2005 joint with WP5

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Publications
CARE Conf-05-015-HIPPI (PAC05) Michael A. Clarke-Gayther Fast-Slow Beam Chopping for Next Generation High Power Proton Drivers
CARE/HIPPI Document-05-003 M. Paoluzzi Status of cern chopper driver and the solid state alternative
CARE/HIPPI Document-05-008 M. A. Clarke-Gayther HIPPI Work Package 4 (WP4) The RALFast Beam Chopper Development Programme Progress Report for the period January 2004 June 2005
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Task (original)

• compare two different approaches to building and
  integrating in a matching line a device able to
  remove micro-bunches with a time duration of few
  nsec

• both approaches make use of electrostatic field
  across two parallel plates placed longitudinally
  in the beam line and driven by a fast amplifier

• the difference between the two approaches is in
  the amplifier design, in the range of duty cycle
  that it can cover and in the integration of the
  chopper in the beam line.

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Tasks
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WBS Title Original begin date (Annex 1) Original end date (annex1) Estimated Status Revised end date
4.1 Chopper structure A (CERN) Chopper structure A (CERN) Chopper structure A (CERN) Chopper structure A (CERN) Chopper structure A (CERN)
4.1.1 Pre-prototype construction January 2004 June 2004 Finished June2005
4.1.2 Pre-prototype testing July 2004 November 2004 Combined with task 4.1.5 December 2005
4.1.3 Driver construction testing January 2004 December 2005 80
4.1.4 Full scale prototype design January 2005 June 2005 Finished
4.1.5 Full scale prototype construction January 2005 December 2005 90
4.2 Chopper line (CERN) Chopper line (CERN) Chopper line (CERN) Chopper line (CERN) Chopper line (CERN)
4.2.1 Dump design January 2004 June 2004 Finished
4.2.2 Dump construction January 2005 June 2005 20 December 2005
4.3 Chopper structure B (RAL) Chopper structure B (RAL) Chopper structure B (RAL) Chopper structure B (RAL) Chopper structure B (RAL)
4.3.1 Pre-prototype design and test January 2004 June 2005 Finished
4.3.2 Prototype design January 2005 December 2005 40
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changes

• CERN
• Driver conception
• Skip the phase of pre-prototype
• RAL
• Beam dynamics (frequency,energy)
• Chopping mechanism (localised dump, quad)

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(No Transcript)
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Achievements
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the deliverables
WBS Title Due date in Annex 1 Status Revised delivery date
4.1.1 Chopper A design report June 2005 delayed December 2005
4.1.2 Intermediate test report March 2005 Waiting for task 4.1.5 March 2006
4.2.2 Dump design report June 2005 pending October 2005
4.3.1 Chopper B intermediate report June 2005 Delivered July2005
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Collaboration

• 1. Activity at RAL re-design of the chopper line
  optics - based on the idea of amplification of
  chopper beam deflection with a downstream
  defocusing quadrupole. This is an example of a
  CERN based idea influencing the RAL design
  effort.
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• 2. Activity at RAL regarding the modification to
  the design of RAL slow wave structure C, to
  enable it to fit into the bore of a quadrupole -
  prompted by the possibility of testing on the
  CERN front-end test facility. An example of a
  CERN based requirement influencing RAL design.
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• 3. Activity at CERN regarding the design of the
  new FET based bipolar pulser. This approach came
  about as a result of the cross fertilisation of
  ideas between CERN and RAL.  Example of RAL
  helping the CERN effort.
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• 4. Activity during the last HIPPI meeting at
  Abingdon (and subsequently), regarding a meeting
  between J. Hares (Director Chief Designer,
  Kentech Instruments Ltd, UK), CERN and RAL
  representatives with the purpose of discussing
  the possibility of alternative pulse generator
  designs for the CERN chopper. This activity has
  also (subsequently) involved discussions with
  Bill Foster regarding a Fermilab linac upgrade
  scheme. This is an example of a RAL based
  connection with a specialist manufacturer being
  utilised by a CERN based collaborator (and a
  FERMILAB based colleague).

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Ingredients of the working package

• Chopper (plates and drivers)
• Beam dynamics
• Beam lines

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todays program

• Status of the CERN chopper (255) - M.Paoluzzi
• Status of the RAL Fast-Slow beam chopper
  development programme (255) - M.
  Clarke-Gayther
• The FETS Front End Test Stand (155) D.
  Findlay
• Beam dynamics studies and design options for the
  RAL FETS chopper line (105) - G.Bellodi
• Status of the CERN Chopper line (105) -
  A.Lombardi
• Design of a rebunching cavity for the RAL FETS
  chopper line (10) - C. Plostinar