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Compact Tunable RF Cavities for Advanced Ion Accelerators

Explore the development of compact tunable RF cavities for FFAG synchrotrons, discussing their potential applications in medical accelerators and upgrading existing machines. Learn about the design considerations and benefits of these RF cavities.

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Compact Tunable RF Cavities for Advanced Ion Accelerators

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  1. m Muons, Inc. Tunable RF Cavities Using Orthogonally Biased Ferrite Milorad Popovic (with Mike Neubauer, Chuck Ankenbrandt, Katsuya Yonehara, Al Moretti and Rol Johnson) FFAG09

  2. m Muons, Inc. • Introduction • New developments in the design of fixed-field alternating gradient (FFAG) synchrotrons have sparked interest in their use as rapid cycling, high-intensity accelerators of ions, protons, and muons. Potential FFAG applications include medical accelerators of protons and light ions for cancer therapy, proton drivers for neutron or muon production, and rapid muon accelerators. The successful development of compact tunable RF cavities for these machines will establish/enhance the feasibility of FFAG machines for these purposes. • Another use of these RF cavities is to upgrade older machines that require new capabilities but have limited space for new components. In the 8 GeV Fermilab Booster synchrotron second harmonic RF cavities could provide improved proton capture during injection as well as reduce beam losses in transitions. An additional potential use is upgrading the RF system of the Fermilab Main Injector to prepare it for a new H minus linac that would replace the Booster. FFAG09

  3. m Muons, Inc. FFAG09

  4. m Muons, Inc. FFAG09

  5. m Muons, Inc. FFAG09

  6. m Muons, Inc. FFAG09

  7. m Muons, Inc. FFAG09

  8. m Muons, Inc. GammaProject

  9. m Muons, Inc. A Tale of Two Cavities Best of Times-Worst of Times For HCC Vacuum Cavity Cu/Steel ceramics Vacuum/H/He MuCool RF Workshop-Fermilab

  10. m Muons, Inc. Motivation To fit pressurized cavities in HCC, size of cavity has to be reduced 800 MHz (from Katsuya) Maximum RF cavity radius = 0.08 m, (pillbox cavity 0.143)Radius of effective electric field (95 % from peak) = 0.03 m 400 MHz:Maximum RF radius = 0.16 m (pillbox cavity 0.286) Radius of effective electric field = 0.06 mOptimum electric field gradient = 16 MV/m For Pill Box Cavity, resonant frequency is MuCool RF Workshop-Fermilab

  11. m Muons, Inc. MuCool RF Workshop-Fermilab

  12. m Muons, Inc. MuCool RF Workshop-Fermilab

  13. m Muons, Inc. Geometry for electrostatic calculations Length: 12 cm I/M = 2 Upstream electrode = -100 kV Downstream electrode = 100 kV er = 7 Equipotentials:DU = 4 kV M I Based on Leopold et al.:Optimizing the Performance of Flat-surface, High-gradient Vacuum Insulators MuCool RF Workshop-Fermilab

  14. m Muons, Inc. FFAG09

  15. m Muons, Inc. FFAG09

  16. m Muons, Inc. EZERO = 16.00000 MV/m Frequency = 516.07816 MHz Stored energy = 8.7582869 Joules Using standard room-temperature copper. Surface resistance = 5.92678 milliOhm Normal-conductor resistivity = 1.72410 microOhm-cm Operating temperature = 20.0000 C Power dissipation = 2064.6435 kW Q = 13755.3 Shunt impedance = 18.475 MOhm/m Rs*Q = 81.525 Ohm Z*T*T = 14.719 MOhm/m r/Q = 159.437 Ohm Wake loss parameter = 0.12925 V/p MuCool RF Workshop-Fermilab

  17. m Muons, Inc. GammaProject

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