| Paper |
Title |
Page |
| MOPP080 |
Studies of Breakdown in a Pressurized RF Cavity
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736 |
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- 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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| WEPP120 |
G4Beamline Particle Tracking in Matter-dominated Beam Lines
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2776 |
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- T. J. Roberts, K. B. Beard
Muons, Inc, Batavia
- S. Ahmed, D. M. Kaplan, L. K. Spentzouris
Illinois Institute of Technology, Chicago, Illinois
- D. Huang
IIT, Chicago, Illinois
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Most computer programs that calculate the trajectories of particles in accelerators assume that the particles travel in an evacuated chamber. The development of muon beams, which are needed for future facilities such as muon colliders and neutrino factories, is limited by the lack of user-friendly numerical simulation codes that accurately calculate scattering and energy loss in matter. Geant4 is an internationally supported tracking toolkit that was developed to simulate particle interactions in large detectors for high energy physics experiments, and includes most of what is known about the interactions of particles and matter. Geant4 has been partially adapted in a program called G4beamline to develop muon beam line designs. We are continuing the development of G4beamline to enhance its graphical user-interface and add other features to the program to facilitate its use by a larger set of beam line and accelerator developers.
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