Proton Driver Director

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Proton Driver Directors Review800 AM
QuestionsI would like to remind the members of
this review committee that I do not usually stay
up this late.
-Bob Palmer

• G. W. Foster

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Pulse Length Issues

• Input Assumptions / Boundary Conditions
• 8 GeV Beam Energy MI Design Point
• 25 uC (1E14) per pulse 200 kJ / pulse
• Free Parameters
• Pulse Length
• Calculated Parameters
• Peak Beam Power ? Klystron Count
• Linac Repetition Rate ? Linac Avg. Power

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Charge Current Time

• This seems true even at 800 AM
• Baseline 25 uC 8.3 mA 3 msec
• Ultimate 25 uC 25 mA 1 msec
• When you make a 8.3 mA 25 mA Linac, you can
  only operate it for 3 msec 1msec before the
  Main Injector is full
• This is why you have to turn up the rep rate when
  you install more klystrons

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Linac Peak Power Drives Klystron Count

• Example (baseline design)
• Klystron Power 10 Klystrons 10 MW 100 MW
• Beam Power 8 GeV 8.3 mA 66.7
  MW
• ?1.5x extra power for RF losses, control margin,
  etc.
• Example (Ultimate design)
• Klystron Power 30 Klystrons 10 MW 300 MW
• Beam Power 8 GeV 25 mA 200 MW
• ?1.5x extra power for RF losses, control margin,
  etc.

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Technological Limitations on Duty Factor

• Klystron Duty factor 1.5 for TESLA MBK
• JPARC Klystron has D.F. gt 5
• Duty cycle decreases slightly at longer pulse
  lengths... Ignore for now.
• RF power coupler (cooling) has similar limit
• Cryoplant also has fixed limit for RF-on Duty
  Factor
• design matches the Klystrons 1.5 D.F. limit
• Must decrease Linac Rep rate at longer pulse
  lengths to respect Duty Cycle limits.

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