1'5GeV Superconducting Proton Linac

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1.5-GeV Superconducting Proton Linac
SCL mini-Workshop -- ORNL June 25-26, 2001

• as the Injector to the 1-MW Average Power AGS

Alessandro G. Ruggiero
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References

• Alessandro G. Ruggiero, Design Considerations on
  a Proton Superconducting Linac, BNL 62312
  Informal Report, Aug. 1995.
• D.Raparia and A.G. Ruggiero, A Super-Conducting
  Linac Injector to the BNL-AGS, BNL C-A/AP/39
  Internal Report, July 2000. Also presented to the
  XX Intern. Linac Conf., Monterey, Calif., Aug.
  2000.
• A.G. Ruggiero, A Super-Conducting Linac as a new
  Injector to the BNL-AGS, BNL C-A/AP/40 Internal
  Report, February 2001.
• M.J. Brennan, et al., Upgrading the AGS to 1 MW
  Proton Beam Power, PAC 2001, Chicago, Illinois.,
  June 2001.
• Alessandro G. Ruggiero, SCL-Template, A Design
  Tool written for EXCEL with VisualBasic.

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AGS 1-MW Power Upgrade
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Layout of the 1.5-GeV Linac
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Front End

• Negative Ion Source
• Current (H-) 37.5 mA
• Platform 30-50 kV
• Rep Rate 2.5 Hz
• Pulse Length 1 ms
• Duty Cycle 0.25
• Emittance, norm. rms 0.3 p mm mrad
• RFQ
• Frequency 201.25 MHz
• Output Energy 750 keV
• Capture Efficiency 80
• Output Current 30 mA
• Chopper
• Frequency 2.057 MHz (h 6 AGS rf frequency)
• Chopping Ratio 60
• Buncher
• Frequency 201.25 MHz

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Low-Energy Section

• Upgrade can be at RT as done for Fermilab
• Or it can be Superconducting
• In both cases the length is about the same (75
  m)
• The average Accelerating Gradient 3.8 MeV/m
• Cost also about the same ( 40 M)

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Medium - High - Energy Sections

• Both are Superconducting
• Operate at 1610 MHz (l 18.62 cm)
• Each have the same geometry ad size of a cavity
  cell adjusted in length to an intermediate value
  b0
• Lcell l b0 / 2

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Configuration of a SC Linac Section
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General Parameters of SC Sections
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Power Distribution
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Cost (00 ) and other Parameters
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Dimensions
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RF Parameters
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RF Power Breakdown
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Cost
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Aperture to Beam Size Ratio
Low-Energy Section
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Quadrupole Gradient
Low-Energy Section
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rms Bunch Length Spread
Low-Energy Section
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Axial Accelerating Field
Low-Energy Section
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Transit Time Factor
Low-Energy Section
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Dissipitated Cryogenic Power
Low-Energy Section
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Longitudinal Tune / Cryostat
Low-Energy Section
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Envelope Amplitude
Low-Energy Section
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Alpha during Mismatch
Low-Energy Section