1 / 12

A New MIRF System

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

bill
Download Presentation

A New MIRF System

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. A New MIRF System David Wildman Alex Chen, Zubao Qian, Vincent Wu March 16 , 2005

  2. Outline • Specifications • Beam Loading and Stability • Cavity Design • Mafia Simulations • Costs • Conclusions wildman - Proton Driver Director's Review

  3. 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

  4. 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

  5. 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

  6. 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

  7. New RF Cavity wildman - Proton Driver Director's Review

  8. New RF Cavity wildman - Proton Driver Director's Review

  9. 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

  10. Tuning Range vs. Tuner CouplingVincent Wu (MI Dept) Ferrite: ’=13.5 ’=1.22.5 wildman - Proton Driver Director's Review

  11. 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

  12. 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

More Related