Distribution uniformity of laser-accelerated proton beams
Compared with conventional accelerators, laser plasma accelerators can generate high energy ions at a greatly reduced scale, due to their TV/m acceleration gradient. A compact laser plasma accelerator （CLAPA） has been built at the Institute of Heavy Ion Physics at Peking University. It will be used...
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| Published in | Chinese physics C Vol. 41; no. 9; pp. 146 - 154 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
01.09.2017
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1674-1137 0254-3052 |
| DOI | 10.1088/1674-1137/41/9/097001 |
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| Summary: | Compared with conventional accelerators, laser plasma accelerators can generate high energy ions at a greatly reduced scale, due to their TV/m acceleration gradient. A compact laser plasma accelerator （CLAPA） has been built at the Institute of Heavy Ion Physics at Peking University. It will be used for applied research like biological irradiation, astrophysics simulations, etc. A beamline system with multiple quadrupoles and an analyzing magnet for laser-accelerated ions is proposed here. Since laser-accelerated ion beams have broad energy spectra and large angular divergence, the parameters （beam waist position in the Y direction, beam line layout, drift distance, magnet angles etc.） of the beamline system are carefully designed and optimised to obtain a radially symmetric proton distribution at the irradiation platform. Requirements of energy selection and differences in focusing or defocusing in application systems greatly influence the evolution of proton distributions. With optimal parameters, radially symmetric proton distributions can be achieved and protons with different energy spread within ±5% have similar transverse areas at the experiment target. |
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| Bibliography: | 11-5641/O4 Jun-Gao Zhu Kun Zhu Li Tao Xiao-Han Xu Chen Lin Wen-Jun Ma Hai-Yang Lu Yan-Ying Zhao Yuan-Rong Lu Jia-Er Chen Xue-Qing Yan（ State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China） laser plasma accelerator, beam line, magnetic system, medical applications, cancer treatment, protondistribution Compared with conventional accelerators, laser plasma accelerators can generate high energy ions at a greatly reduced scale, due to their TV/m acceleration gradient. A compact laser plasma accelerator （CLAPA） has been built at the Institute of Heavy Ion Physics at Peking University. It will be used for applied research like biological irradiation, astrophysics simulations, etc. A beamline system with multiple quadrupoles and an analyzing magnet for laser-accelerated ions is proposed here. Since laser-accelerated ion beams have broad energy spectra and large angular divergence, the parameters （beam waist position in the Y direction, beam line layout, drift distance, magnet angles etc.） of the beamline system are carefully designed and optimised to obtain a radially symmetric proton distribution at the irradiation platform. Requirements of energy selection and differences in focusing or defocusing in application systems greatly influence the evolution of proton distributions. With optimal parameters, radially symmetric proton distributions can be achieved and protons with different energy spread within ±5% have similar transverse areas at the experiment target. |
| ISSN: | 1674-1137 0254-3052 |
| DOI: | 10.1088/1674-1137/41/9/097001 |