| Paper |
Title |
Page |
| MOPP105 |
Compact, Tunable RF Cavities
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802 |
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- M. Popovic, C. M. Ankenbrandt, E. Griffin, A. Moretti, R. E. Tomlin
Fermilab, Batavia, Illinois
- M. Alsharo'a, I. B. Enchevich, R. P. Johnson, S. Korenev
Muons, Inc, Batavia
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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, muons, and electrons. Potential applications include proton drivers for neutron or muon production, rapid muon accelerators, electron accelerators for synchrotron light sources, and medical accelerators of protons and light ions for cancer therapy. Compact RF cavities that tune rapidly over various frequency ranges are needed to provide the acceleration in FFAG lattices. An innovative design of a compact RF cavity that uses orthogonally biased ferrite for fast frequency tuning and liquid dielectric to adjust the frequency range is being developed using physical prototypes and computer models.
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| WEPP028 |
Flexible Momentum Compaction Return Arcs for RLAs
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2578 |
| |
- D. Trbojevic
BNL, Upton, Long Island, New York
- S. A. Bogacz
Jefferson Lab, Newport News, Virginia
- R. P. Johnson
Muons, Inc, Batavia
- M. Popovic
Fermilab, Batavia, Illinois
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Neutrino Factories and Muon Colliders require rapid acceleration of short-lived muons to multi-GeV and TeV energies. A Recirculating Linear Accelerator (RLA) that uses a single Linac and teardrop return arcs can provide exceptionally fast and economical acceleration to the extent that the focusing range of the RLA quadrupoles allows each muon to pass several times through each high-gradient cavity and the cost of the return arcs is appropriate. Flexible Momentum Compaction (FMC) lattice designs for the teardrop return arcs provide sufficient momentum acceptance to allow multiple passes of each sign of muon in one string of magnets to improve cost-effectiveness.
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| WEPP123 |
Isochronous Pion Decay Channel for Enhanced Muon Capture
|
2785 |
| |
- C. Y. Yoshikawa, C. M. Ankenbrandt, D. V. Neuffer, M. Popovic, K. Yonehara
Fermilab, Batavia, Illinois
- R. J. Abrams, M. A.C. Cummings, R. P. Johnson
Muons, Inc, Batavia
- Y. S. Derbenev
Jefferson Lab, Newport News, Virginia
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Intense muon beams have many potential applications, including neutrino factories and muon colliders. However, muons are produced in tertiary beams into a diffuse phase space. To make useful beams, the muons must be rapidly cooled before they decay. A promising new concept for the collection and cooling of muon beams is being investigated, namely, the use of a nearly Isochronous Helical Transport Channel (IHTC) to facilitate capture of muons into RF bunches. Such a distribution could be cooled quickly and coalesced into a single bunch to optimize the luminosity of a muon collider. We describe the IHTC and provide simulations demonstrating isochronicity, even in the absence of RF and absorber.
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| MOPP080 |
Studies of Breakdown in a Pressurized RF Cavity
|
736 |
| |
- M. BastaniNejad, A. A. Elmustafa
Old Dominion University, Norfolk, Virginia
- M. Alsharo'a, P. M. Hanlet, R. P. Johnson, S. Korenev, M. Kuchnir, D. J. Newsham, R. Sah
Muons, Inc, Batavia
- C. M. Ankenbrandt, A. Moretti, M. Popovic, K. Yonehara
Fermilab, Batavia, Illinois
- D. M. Kaplan
Illinois Institute of Technology, Chicago, Illinois
- D. Li
LBNL, Berkeley, California
- D. Rose, C. H. Thoma, D. R. Welch
Voss Scientific, Albuquerque, New Mexico
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Previous studies of RF breakdown in a cavity pressurized with dense hydrogen gas have indicated that breakdown probability is proportional to a high power of the surface electromagnetic field. This behavior is similar to the Fowler-Nordheim description of electron emission from a cold cathode, and it implies that breakdown is a quantum mechanical effect that is characterized by the work function of the cavity metal. We describe our present efforts to measure the distributions of work functions at the nanoscale level on the surfaces of the electrodes used in breakdown studies, and to understand how the RF conditioning process affects them.
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