| Physical design of FEL injector based on the performance-enhanced EC-ITC RF gun |
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| 作者姓名： | 胡桐宁 陈曲珊 裴元吉 李骥 秦斌 |
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| 作者单位： | 1 State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China;;2 National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China |
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| 摘 要： | To meet the requirements of high performance THz-FEL (Free Electron Laser), a compact scheme of FEL injector was proposed. A thermionic cathode was chosen to emit electrons instead of a photo-cathode with its complex structure and high cost. The effective bunch charge was improved to ～200 pC by adopting an enhanced EC-ITC (External Cathode Independently Tunable Cells) RF gun to extract micro-bunches; back bombardment effects were almost eliminated as well. Constant gradient accelerator structures were designed to improve energy to ～14 MeV, while the focusing system was applied for emittance suppressing and bunch state maintenance. The physical design and beam dynamics of the key components for the FEL injector were analyzed. Furthermore, start-to-end simulations with multi-pulses were performed using homemade MATLAB and Parmela. The results show that continual high brightness electron bunches with a low energy spread and emittance could be obtained stably.
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| 关 键 词： | RF gun EC-ITC beam dynamics LINAC FEL injector |
| 收稿时间： | 2013-3-22 |
Physical design of FEL injector based on the performance-enhanced EC-ITC RF gun |
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| Abstract: | To meet the requirements of high performance THz-FEL(Free Electron Laser),a compact scheme of FEL injector was proposed.A thermionic cathode was chosen to emit electrons instead of a photo-cathode with its complex structure and high cost.The effective bunch charge was improved to~200 pC by adopting an enhanced EC-ITC(External Cathode Independently Tunable Cells)RF gun to extract micro-bunches;back bombardment,effects were almost eliminated as well.Constant gradient accelerator structures were designed to improve energy to~14 MeV,while the focusing system was applied for emittance suppressing and bunch state maintenance.The physical design and beam dynamics of the key components for the FEL injector were analyzed.Furthermore,startto-end simulations with multi-pulses were performed using homemade MATLAB and Parmela.The results show that continual high brightness electron bunches with a low energy spread and emittance could be obtained stably. |
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| Keywords: | RF gun EC-ITC beam dynamics LINAC FEL injector |
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