| Paper |
Title |
Page |
| TU203 |
High Pressure, High Gradient RF Cavities for Muon Beam Cooling
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266 |
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- R. P. Johnson, M. Popovic
FNAL, Batavia, Illinois
- M.M. Alsharo'a, R.E. Hartline, M. Kuchnir, T.J. Roberts
Muons, Inc., Batavia
- C. M. Ankenbrandt, A. Moretti
Fermilab, Batavia, Illinois
- K. Beard, A. Bogacz, Y.S. Derbenev
Jefferson Lab, Newport News, Virginia
- D. M. Kaplan, K. Yonehara
IIT, Chicago, Illinois
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High intensity, low emittance muon beams are needed for new applications such as muon colliders and neutrino factories based on muon storage rings. Ionization cooling, where muon energy is lost in a low-Z absorber and only the longitudinal component is regenerated using RF cavities, is presently the only known cooling technique that is fast enough to be effective in the short muon lifetime. RF cavities filled with high-pressure hydrogen gas bring two advantages to the ionization technique: - the energy absorption and energy regeneration happen simultaneously rather than sequentially, and
- higher RF gradients and better cavity breakdown behavior are possible than in vacuum due to the Paschen effect.
These advantages and some disadvantages and risks will be discussed along with a description of the present and desired RF R&D efforts needed to make accelerators and colliders based on muon beams less futuristic.
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Transparencies
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| TU204 |
Effect of High Solenoidal Magnetic Fields on Breakdown Voltages of High Vacuum 805 MHz Cavities
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271 |
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- A. Moretti, A.D. Bross, S. Geer, Z. Qian
Fermilab, Batavia, Illinois
- D.M. Errede
University of Illinois at Urbana-Champaign, Urbana, Illinois
- D. Li
LBNL/AFR, Berkeley, California
- J. Norem
ANL, Argonne, Illinois
- R.A. Rimmer
Jefferson Lab, Newport News, Virginia
- Y. Torun
IIT, Chicago, Illinois
- M.S. Zisman
LBNL, Berkeley, California
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The demonstration of muon ionization cooling by a large factor is necessary to demonstrate the feasilibility of a collider or neutrino factory. An important cooling experiment, MICE [1], has been proposed to demonstrate 10 % cooling which will validate the technology. Ionization cooling is accomplished by passing a high-emittance beam in a multi-Tesla solenoidal channel alternately through regions of low Z material and very high accelerating RF Cavities. To determine the effect of very large solenoidal magnetic fields on the generations of Dark current, X-Rays and breakdown Voltage gradients of vacuum RF cavities, a test facility has been established at Fermilab in Lab G. This facility consists of a 12 MW 805 MHz RF station, and a large bore 5 T solenoidal superconducting magnet containing a pill box type Cavity with thin removable window apertures allowing dark current studies and breakdown studies of different materials. The results of this study will be presented. The study has shown that the peak achievable accelerating gradient is reduced by almost a factor two in a 4 T field.
[1] http://mice.iit.edu/.
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Transparencies
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