Green's function analysis of bunched charged particle beams
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 2002.
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| Formato: | Thesis |
| Idioma: | eng |
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Massachusetts Institute of Technology
2008
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| Acceso en liña: | http://dspace.mit.edu/handle/1721.1/8530 http://hdl.handle.net/1721.1/8530 |
| _version_ | 1826208531724894208 |
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| author | Hess, Mark H. (Mark Harry), 1975- |
| author2 | Richard Temkin and Chiping Chen. |
| author_facet | Richard Temkin and Chiping Chen. Hess, Mark H. (Mark Harry), 1975- |
| author_sort | Hess, Mark H. (Mark Harry), 1975- |
| collection | MIT |
| description | Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 2002. |
| first_indexed | 2024-09-23T14:07:07Z |
| format | Thesis |
| id | mit-1721.1/8530 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T14:07:07Z |
| publishDate | 2008 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/85302019-04-11T07:04:42Z Green's function analysis of bunched charged particle beams Hess, Mark H. (Mark Harry), 1975- Richard Temkin and Chiping Chen. Massachusetts Institute of Technology. Dept. of Physics. Massachusetts Institute of Technology. Dept. of Physics. Physics. Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 2002. Includes bibliographical references (leaves 145-149). In this thesis, we analyze the dynamics and equilibrium of bunched charged particle beams in the presence of perfectly conducting walls using a Green's function technique. Exact self-consistent electric and magnetic fields are obtained for charged particles in the vicinity of a conducting boundary with the use of Green's functions. We present three analytical models of bunched beams in a cylindrical conducting pipe which employ Green's functions, the Non-Relativistic Center-of-Mass (NRCM) model, the Relativistic Center-of-Mass (RCM) model, and the Relativistic Bunched Disk Beam (RBDB) model. The NRCM model assumes that the bunches are periodic and represented as point charges propagating non-relativistically in the presence of a constant magnetic focusing field. We derive a maximum limit on the effective self-field parameter ... necessary for confining the bunched beam, where wp, is the effective plasma frequency and at is the cyclotron frequency. The RCM model extends the analysis of the NRCM model to incorporate relativistic motion of the bunches in the presence of a periodic solenoidal focusing field. We derive a maximum limit on ... for confinement, where ... is the root-mean-square cyclotron frequency. We demonstrate how the self-field parameter limit can be used to predict a current limit in Periodic Permanent Magnet (PPM) klystrons. The 75 MW-XP PPM 11.4 GHz klystron designed by SLAC is found to be operating above this current limit, which may explain the observance of non-negligible beam loss in this experiment. by Mark H Hess. (cont.) We model bunches with zero longitudinal thickness and azimuthally symmetric finite transverse distributions in the RBDB model. We derive a limit on ... and apply this limit to bunched annular electron beams. The LANL 1.3 GHz relativistic klystron amplifier (RKA), a high-power microwave source using bunched annular electron beams, is found to be operating slightly above this limit, which may explain the observance of beam loss and anomalous beam halo formation. Finally, we present preliminary results of a Green's function based code called PFB3D, which simulates the dynamics of bunched charged particle beams in a cylindrical conducting pipe. We utilize this code to simulate the dynamics of the LANL 1.3 GHz RKA experiment. Ph.D. 2008-05-19T16:56:54Z 2008-05-19T16:56:54Z 2002 2002 Thesis http://dspace.mit.edu/handle/1721.1/8530 http://hdl.handle.net/1721.1/8530 50880547 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/8530 http://dspace.mit.edu/handle/1721.1/7582 155 leaves application/pdf Massachusetts Institute of Technology |
| spellingShingle | Physics. Hess, Mark H. (Mark Harry), 1975- Green's function analysis of bunched charged particle beams |
| title | Green's function analysis of bunched charged particle beams |
| title_full | Green's function analysis of bunched charged particle beams |
| title_fullStr | Green's function analysis of bunched charged particle beams |
| title_full_unstemmed | Green's function analysis of bunched charged particle beams |
| title_short | Green's function analysis of bunched charged particle beams |
| title_sort | green s function analysis of bunched charged particle beams |
| topic | Physics. |
| url | http://dspace.mit.edu/handle/1721.1/8530 http://hdl.handle.net/1721.1/8530 |
| work_keys_str_mv | AT hessmarkhmarkharry1975 greensfunctionanalysisofbunchedchargedparticlebeams |