High Intensity Neutrino Source HINS Linac FrontEnd R

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High Intensity Neutrino SourceHINS Linac
Front-End RD ---Systems Integration, Beam
Diagnostics Needs, and Meson Lab Setup

• Bob Webber

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Motivation and Timeline

• Motivation
• Test key un-proven technologies important to the
  low-energy front-end (ßlt0.4) section of the
  proposed 8 GeV Superconducting H- Linac
• Timeline
• Accomplish the RD necessary to establish
  technical credibility and cost basis for the
  Linac front-end by 2010
• Funding Resources
• 10M in FY06 (FNAL and collaborators SWF and
  MS)
• similar funding projected for FY07 and 08 until
  recent rumblings from DOE (within the last 4
  weeks)

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RD Objectives

• Demonstrate high power RF distribution and 4.5
  millisecond pulse operation of multiple cavities
  from a single klystron
• Demonstrate device and system performance of high
  power vector (IQM) modulators for amplitude and
  phase control of multiple cavities
• Measure axially-symmetric beam performance with
  RT-CH (room temperature, crossbar H-type) spoke
  resonator cavities and SC solenoid focusing in
  the RT Linac
• Demonstrate low transition energy (10 MeV) to and
  application of superconducting spoke resonator
  accelerating structures
• Demonstrate high-speed (nanosecond) beam
  chopping at 2.5 MeV
• Demonstrate performance of this Linac concept and
  resulting beam quality to 90 MeV

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RD Plan

• Install and commission 2.5 MW, 325 MHz klystron
  system
• Equip and operate a 325 MHz high power RF
  component test facility
• Fabricate, install, and operate a test cryostat
  for 325 MHz SC spoke cavities
• Construct and test key components of the
  low-energy Linac concept
• Assemble the 10 MeV RT Linac, operate with beam,
  and verify performance
• Install 325 MHz SC spoke resonator cryomodules
  and operate with beam up to 90 MeV
• This all adds up to building a first-of-its-kind
  superconducting 90 MeV H- linac

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Major Activity Areas in Meson

• 325 MHz Klystron and Modulator Area
• 325 MHz RF Component Test Facility
• Cavity Test Cave (RT-CH and superconducting
  cavities)
• Ion Source, RFQ, and 2.5 MeV Absorber Area
• 90 MeV Accelerator and Beam Absorber Cave

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Meson Building Floor Plan
Cavity Test Cave
RF Component Test Facility
Klystron and Modulator Area
90 MeV Linac
Ion Source and RFQ Area
200 ft.
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View Into Klystron/Modulator Area (early May)
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325 MHz 2.5MW Klystron (early May)
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4.5 msec Klystron Pulse Transformer (early May)
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325 MHz Waveguide Circulator (early May)
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View Into Klystron/Modulator Area (June 9)
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View Into Klystron/Modulator Area (June 9)
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Klystron and Waveguide (June 16)
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Modulator Capacitor Cabinet (front) (June 28)
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Modulator Switch Cabinet (back) (June 28)
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Modulator Switch Cabinet (front) (June 28)
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View Down (Future) Linac Beam Line
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Layout Through Second ß.4 Cryostat
Ion Source
RFQ
MEBT
Room Temperature 16-Cavity, 16 SC Solenoid Section
2.5 MeV
50 KeV
10 MeV
Two ?0.2 SSR 9-Cavity, 9-Solenoid Cryostats
20 MeV
30 MeV
Two ?0.4 SSR 11-Cavity, 6-Solenoid Cryostats
90 MeV
60 MeV
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Meson Linac Cave Cross-section
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Beam Diagnostics - Minimum on-line (P. Ostroumov)

• Current transformers (CT)
• Beam phase pick-up necessary to control energy
  stability during the operation
• Initial tune-up of the cavity field and phase
• Beam profile wire scanners (or/and laser
  scanners)
• Beam loss monitors about 20 distribute along
  the linac
• Inter-cryostat space should include
• CT
• BPM, includes phase pick-up
• Wire scanner

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Off-line (temporary installation)

• The temporary diagnostics station is desirable to
  use at the end of the following linac sections
• RFQMEBT, RT section, SSR1, SSR2 - will be
  permanent place
• Diagnostics station includes (minimum set)
• 1 solenoid (or 3 quads, triplet)
• 2 steering magnets
• 2 BPMs, includes phase pick-up
• 3 profile monitors
• 2 current transformers
• Beam dump water cooled
• Energy degrader
• Faraday cup
• Fast Faraday cup
• CCD camera with the quartz foil
• Maximum set, extend for
• Emittance station slit-collector copy from
  SNS
• Bunch length custom design

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Machine and Beam Parameters

• Two operating modes providing 1.56E14 ppp
• 3 millisecond 8.6 mAaverage beam pulse at 2.5
  Hz
• 1 millisecond 26 mAaverage beam pulse at 10 Hz
• Bunch Frequency 325 MHz
• (1/4 of ILC 1.3 GHz)
• Chopped in MEBT (2.5MeV) at 53 MHz ( 2 of 6
  bunches missing) and at 89 KHz (1.6 microsecond
  gap) therefore peak beam current is 1.5 times
  average current stated above
• Beam tube aperture
• 20mm bore radius through focusing solenoids
  15mm? through warm RF cavities

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Baseline - 05/15/06 Trans. envelopes
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MEBT June 12, 2006 Dimensions OK
Increase this space and use it for the steering
magnet
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CH-SSR1
Strip-line BPM
This space can be increased up to 204 mm
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So What is Needed Now?

• Beam current transformer electromechanical
  designs
• BPM pick-up electromechanical design(s) for RT
  and SSR Linac sections
• Scanning wire electromechanical designs
• Laser wire design
• Beam phase monitor system design
• Beam energy analysis system
• Beam bunch length monitor?
• Electronics for all above

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SNS Diagnostics plate
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BPM (SNS)
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Meson Schedule 2006

• Short mock Linac cave section available
• May 2006 ?
• Klystron modulator completion
• July 2006 (late July)
• 325 MHz RF power system commissioning
• July 2006 (early August)
• 325 MHz component testing in RF test area
• Starting August 2006
• 325 MHz RT cavity power testing in cavity test
  cave
• September 2006
• Superconducting cavity test cryostat installation
• October 2006
• Ion Source installation in Meson
• November 2006

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Meson Schedule 2007

• RFQ (now in procurement) delivery and power
  testing
• January 2007
• RT cavity and coupler testing
• Starting February 2007
• 2.5 MeV beam tests
• Beginning February 2007
• First SC spoke resonator power tests in test
  cryostat
• April 2007
• Linac cave construction and utilities
  installation
• May 2007
• Demonstration of multiple cavity RF distribution
  and independent amplitude phase control
• July 2007
• Beam accelerated through first N RT cavities
• September 2007 (optimistic)

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Meson Schedule 2008

• Full 10 MeV RT linac installed
• April 2008
• RD beam operations at 10 MeV
• Starting May 2008
• First SC spoke resonator cryomodule installation
• October 2008
• Tests of RT SC cavity RF distribution and
  independent amplitude phase control
• November 2008
• Beam through first SC spoke cryomodule
• December 2008 (optimistic)

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Manpower Resources

• A Lab-Wide effort is required and now being
  applied
• Beam line components are designed and procured by
  Technical Division
• RF and conventional power source components and
  systems integration and operation are the
  responsibility of the Accelerator Division
• Particle Physics Division is supplying manpower
  for utilities and infrastructure installation in
  the Meson building
• Laboratory Safety Section and Accelerator
  Division Safety Department are already at this
  early stage actively involved
• Key technical systems now lacking required
  attention
• RF power distribution system (tightly coupled
  with cavity design status and power requirements)
• Low level RF systems system design, modeling,
  hardware (partially mitigated via LBNL MoU)
• Cryogenics delivery system engineering for the
  Meson Linac cave
• Beam instrumentation design (partially mitigated
  by BNL MoU)

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Summary

• Considerable activity is now underway on
  component design, procurement, and facilities to
  support planned RD
• It will be an exciting next 12 months to bring
  325 MHz klystron and RFQ on-line and to
  accelerate beam in the Meson Building
• Key areas, presently lacking effort necessary to
  maintaining desired schedule, are identified

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Backup Slides
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Meson Building Floor Plan
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Modified, 05/25, Trans. envelopes