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A New MIRF System. David Wildman Alex Chen, Zubao Qian, Vincent Wu March 16 , 2005. Outline. Specifications Beam Loading and Stability Cavity Design Mafia Simulations Costs Conclusions. Specifications. Intensity of 1.5E14 per MI cycle Maximum ramp rate of 305 GeV/s

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a new mirf system

A New MIRF System

David Wildman

Alex Chen, Zubao Qian, Vincent Wu

March 16 , 2005

outline
Outline
  • Specifications
  • Beam Loading and Stability
  • Cavity Design
  • Mafia Simulations
  • Costs
  • Conclusions

wildman - Proton Driver Director's Review

specifications
Specifications
  • Intensity of 1.5E14 per MI cycle
  • Maximum ramp rate of 305 GeV/s
  • Cavity peak voltage of 300 kV
  • 18 RF stations - same as current system
  • Frequency sweep: 52.814 MHz to 53.104 MHz

wildman - Proton Driver Director's Review

beam loading
Beam Loading
  • Both transient and steady-state beam loading are proportional to the cavity shunt impedance, Rs, divided by the cavity Q.
    • Rs/Q only depends on the cavity geometry
    • For a coaxial quarter wave resonator, Rs/Q can be adjusted by changing the characteristic impedance of the line
  • The new RF cavity will have 4x smaller Rs/Q
    • Rs/Q reduced from 104 to 25.
    • This will enable us to achieve 4x the present intensity with the same beam loading effects we see today.

wildman - Proton Driver Director's Review

beam stability
Beam Stability
  • For a detuned cavity without feedback, the RF system reaches the Robinson instability limit when the power dissipated in the cavity equals the power being delivered to the beam.
  • For our case, the maximum power delivered to the beam will be 407 kW/cavity.
  • The maximum power dissipation in the cavity is chosen to be ~ 450 kW.
  • Guaranteeing beam stability without any feedback is the most conservative design.

wildman - Proton Driver Director's Review

system specifications
System Specifications
  • Rs/Q = 25, low Z transmission line
  • Rs/Q = 100 kΩ, Q = 4000 from copper coated stainless construction.
  • Perpendicularly biased garnet tuners
  • Present RF system will be driver for new system.
  • Power tetrode: CPI Eimac 8973 (1MW) or Thales TH525 (1.5 MW)

wildman - Proton Driver Director's Review

new rf cavity
New RF Cavity

wildman - Proton Driver Director's Review

new rf cavity1
New RF Cavity

wildman - Proton Driver Director's Review

simulation model for main injector new cavity with tuner vincent wu mi dept

Simulation Model for Main Injector New Cavity with TunerVincent Wu (MI Dept)

Blue: copper

Teal: stainless steel

Green: ceramic window

Red: ferrites

wildman - Proton Driver Director's Review

tuning range vs tuner coupling vincent wu mi dept
Tuning Range vs. Tuner CouplingVincent Wu (MI Dept)

Ferrite: ’=13.5 ’=1.22.5

wildman - Proton Driver Director's Review

cost per rf station
Cost per RF Station
  • Cavity - $150k
  • Amplifier - $300k
  • 2 MW dc supply - $500k
  • Controls - $50k
  • Installation - $100k
  • Cost per station - $1.1M
  • Total cost for entire RF system - $20M

wildman - Proton Driver Director's Review

conclusions
CONCLUSIONS
  • Conservative design for beam stability
  • Total cost ~ $20M excluding civil, utilities, and contingency
  • The next step -- build a prototype cavity and amplifier

wildman - Proton Driver Director's Review