Simulation study on the emittance compensation of off-axis emitted beam in RF photoinjector
Abstract
To make full use of the photocathode material and improve its quantum efficiency lifetime, it can be necessary to operate the laser away from the cathode center in photoinjectors. In RF guns, the off-axis emitted beam will see a time-dependent RF effect, which would generate a significant growth in transverse emittance. It has been demonstrated that such an emittance growth can be almost completely compensated by orienting the beam on a proper orbit in the downstream RF cavities along the injector [1]. In this paper we analyze in detail the simulation techniques used in reference [1] and the issues associated with them. The optimization of photoinjector systems involving off-axis beams is a challenging problem. To solve this problem, one needs advanced simulation tools including both genetic algorithms and an efficient algorithm for 3D space charge. In this paper, we report on simulation studies where the two codes ASTRA and IMPACT-T are used jointly to overcome these challenges, in order to optimize a system designed to compensate for the emittance growth in a beam emitted off axis.
- Authors:
-
- Univ. of Science and Technology of China, Hefei (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Univ. of Science and Technology of China, Hefei (China)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Nature Science Foundation of China
- OSTI Identifier:
- 1405297
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Chinese Physics. C, High Energy Physics and Nuclear Physics
- Additional Journal Information:
- Journal Volume: 40; Journal Issue: 11; Journal ID: ISSN 1674-1137
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; photoinjector; off-axis emission; genetic algorithm; ASTRA; IMPACT-T; RF effect; emittance compensation
Citation Formats
Huang, Rui -Xuan, Mitchell, Chad, Jia, Qi -Ka, Papadopoulos, Christos, and Sannibale, Fernando. Simulation study on the emittance compensation of off-axis emitted beam in RF photoinjector. United States: N. p., 2016.
Web. doi:10.1088/1674-1137/40/11/117004.
Huang, Rui -Xuan, Mitchell, Chad, Jia, Qi -Ka, Papadopoulos, Christos, & Sannibale, Fernando. Simulation study on the emittance compensation of off-axis emitted beam in RF photoinjector. United States. https://doi.org/10.1088/1674-1137/40/11/117004
Huang, Rui -Xuan, Mitchell, Chad, Jia, Qi -Ka, Papadopoulos, Christos, and Sannibale, Fernando. Tue .
"Simulation study on the emittance compensation of off-axis emitted beam in RF photoinjector". United States. https://doi.org/10.1088/1674-1137/40/11/117004. https://www.osti.gov/servlets/purl/1405297.
@article{osti_1405297,
title = {Simulation study on the emittance compensation of off-axis emitted beam in RF photoinjector},
author = {Huang, Rui -Xuan and Mitchell, Chad and Jia, Qi -Ka and Papadopoulos, Christos and Sannibale, Fernando},
abstractNote = {To make full use of the photocathode material and improve its quantum efficiency lifetime, it can be necessary to operate the laser away from the cathode center in photoinjectors. In RF guns, the off-axis emitted beam will see a time-dependent RF effect, which would generate a significant growth in transverse emittance. It has been demonstrated that such an emittance growth can be almost completely compensated by orienting the beam on a proper orbit in the downstream RF cavities along the injector [1]. In this paper we analyze in detail the simulation techniques used in reference [1] and the issues associated with them. The optimization of photoinjector systems involving off-axis beams is a challenging problem. To solve this problem, one needs advanced simulation tools including both genetic algorithms and an efficient algorithm for 3D space charge. In this paper, we report on simulation studies where the two codes ASTRA and IMPACT-T are used jointly to overcome these challenges, in order to optimize a system designed to compensate for the emittance growth in a beam emitted off axis.},
doi = {10.1088/1674-1137/40/11/117004},
journal = {Chinese Physics. C, High Energy Physics and Nuclear Physics},
number = 11,
volume = 40,
place = {United States},
year = {Tue Nov 01 00:00:00 EDT 2016},
month = {Tue Nov 01 00:00:00 EDT 2016}
}
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