Calculation of wakefields in a 17 GHz beam-driven photonic band-gap accelerator structure
We present the theoretical analysis and computer simulation of the wakefields in a 17 GHz photonic band-gap (PBG) structure for accelerator applications. Using the commercial code CST Particle Studio, the fundamental accelerating mode and dipole modes are excited by passing an 18 MeV electron beam t...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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American Physical Society
2013
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| Online Access: | http://hdl.handle.net/1721.1/78256 https://orcid.org/0000-0001-9813-0177 |
| _version_ | 1826215652526915584 |
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| author | Hu, Min Munroe, Brian James Shapiro, Michael Temkin, Richard J. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Hu, Min Munroe, Brian James Shapiro, Michael Temkin, Richard J. |
| author_sort | Hu, Min |
| collection | MIT |
| description | We present the theoretical analysis and computer simulation of the wakefields in a 17 GHz photonic band-gap (PBG) structure for accelerator applications. Using the commercial code CST Particle Studio, the fundamental accelerating mode and dipole modes are excited by passing an 18 MeV electron beam through a seven-cell traveling-wave PBG structure. The characteristics of the longitudinal and transverse wakefields, wake potential spectrum, dipole mode distribution, and their quality factors are calculated and analyzed theoretically. Unlike in conventional disk-loaded waveguide (DLW) structures, three dipole modes (TM[subscript 11]-like, TM[subscript 12]-like, and TM[subscript 13]-like) are excited in the PBG structure with comparable initial amplitudes. These modes are separated by less than 4 GHz in frequency and are damped quickly due to low radiative Q factors. Simulations verify that a PBG structure provides wakefield damping relative to a DLW structure. Simulations were done with both single-bunch excitation to determine the frequency spectrum of the wakefields and multibunch excitation to compare to wakefield measurements taken at MIT using a 17 GHz bunch train. These simulation results will guide the design of next-generation high-gradient accelerator PBG structures. |
| first_indexed | 2024-09-23T16:37:19Z |
| format | Article |
| id | mit-1721.1/78256 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:37:19Z |
| publishDate | 2013 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/782562022-09-29T20:23:14Z Calculation of wakefields in a 17 GHz beam-driven photonic band-gap accelerator structure Hu, Min Munroe, Brian James Shapiro, Michael Temkin, Richard J. Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Plasma Science and Fusion Center Hu, Min Munroe, Brian James Shapiro, Michael Temkin, Richard J. We present the theoretical analysis and computer simulation of the wakefields in a 17 GHz photonic band-gap (PBG) structure for accelerator applications. Using the commercial code CST Particle Studio, the fundamental accelerating mode and dipole modes are excited by passing an 18 MeV electron beam through a seven-cell traveling-wave PBG structure. The characteristics of the longitudinal and transverse wakefields, wake potential spectrum, dipole mode distribution, and their quality factors are calculated and analyzed theoretically. Unlike in conventional disk-loaded waveguide (DLW) structures, three dipole modes (TM[subscript 11]-like, TM[subscript 12]-like, and TM[subscript 13]-like) are excited in the PBG structure with comparable initial amplitudes. These modes are separated by less than 4 GHz in frequency and are damped quickly due to low radiative Q factors. Simulations verify that a PBG structure provides wakefield damping relative to a DLW structure. Simulations were done with both single-bunch excitation to determine the frequency spectrum of the wakefields and multibunch excitation to compare to wakefield measurements taken at MIT using a 17 GHz bunch train. These simulation results will guide the design of next-generation high-gradient accelerator PBG structures. United States. Dept. of Energy. High Energy Physics Division (Contract DEFG02- 91ER40648) China. Fundamental Research Funds for the Central Universities (Contract ZYGX 2010J055) 2013-04-02T18:08:47Z 2013-04-02T18:08:47Z 2013-02 2012-08 Article http://purl.org/eprint/type/JournalArticle 1098-4402 http://hdl.handle.net/1721.1/78256 Hu, Min et al. “Calculation of Wakefields in a 17 GHz Beam-driven Photonic Band-gap Accelerator Structure.” Physical Review Special Topics - Accelerators and Beams 16.2 (2013). https://orcid.org/0000-0001-9813-0177 en_US http://dx.doi.org/10.1103/PhysRevSTAB.16.022002 Physical Review Special Topics - Accelerators and Beams Creative Commons Attribution 3.0 http://creativecommons.org/licenses/by/3.0/ application/pdf American Physical Society APS |
| spellingShingle | Hu, Min Munroe, Brian James Shapiro, Michael Temkin, Richard J. Calculation of wakefields in a 17 GHz beam-driven photonic band-gap accelerator structure |
| title | Calculation of wakefields in a 17 GHz beam-driven photonic band-gap accelerator structure |
| title_full | Calculation of wakefields in a 17 GHz beam-driven photonic band-gap accelerator structure |
| title_fullStr | Calculation of wakefields in a 17 GHz beam-driven photonic band-gap accelerator structure |
| title_full_unstemmed | Calculation of wakefields in a 17 GHz beam-driven photonic band-gap accelerator structure |
| title_short | Calculation of wakefields in a 17 GHz beam-driven photonic band-gap accelerator structure |
| title_sort | calculation of wakefields in a 17 ghz beam driven photonic band gap accelerator structure |
| url | http://hdl.handle.net/1721.1/78256 https://orcid.org/0000-0001-9813-0177 |
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