Theoretical and simulation study of ‘Comb’ electron beam and THz generation
| Autor: | V.J. Joshi, Ulf Lehnert, J. Karmakar, Alexander Aryshev, Rakesh K. Bhandari, S. Ghosh, Narendra Kumar, B. Karmakar, J. Urakawa, Sumit Tripathi, D. Kanjilal |
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| Rok vydání: | 2019 |
| Předmět: |
radiation source
Accelerator Physics (physics.acc-ph) Nuclear and High Energy Physics Terahertz radiation THz source comb beam FOS: Physical sciences Physics::Optics 01 natural sciences super-radiant emission Photocathode law.invention 010309 optics Optics law 0103 physical sciences 010306 general physics Instrumentation Electron gun Physics business.industry radiation emission Free-electron laser linear accelerator Undulator Laser Beamline pre-bunched beam Physics::Accelerator Physics Physics - Accelerator Physics THz business undulator radiation Beam (structure) |
| Zdroj: | Nuclear Instruments and Methods in Physics Research A 931(2019), 28-39 |
| ISSN: | 0168-9002 |
| DOI: | 10.1016/j.nima.2018.10.072 |
| Popis: | A compact accelerator based super-radiant THz source is under development at Inter University Accelerator Centre (IUAC), New Delhi. The facility is based on the principle of pre-bunched Free Electron Laser (FEL) which will produce THz radiation in the range of ∼ 0.18 to 3 THz from a modulated electron beam. A photocathode electron gun will generate a short train of micro-bunches (a “comb” beam) driven by a fibre laser system capable of producing multi micro-pulse laser beam with variable separation (“comb” laser pulse). Upon acceleration, the electron beam will be injected in to a compact undulator magnet tuned to the same frequency as the separation of the electron micro-bunches. The paper discusses the process of enhancement of super-radiant emission of radiation due to modulation in the comb beam and the conditions required to achieve maximum enhancement of the radiation power. The feasibility study of generating a comb beam at the photocathode and its transport through the beamline while preserving its temporal structure has been reported. To evaluate the characteristics of the radiation emitted from the comb beam, a C + + based particle tracker and Liẽnard–Wiechert field solver has been developed. The conceptual understanding of the emission of radiation from comb beam is shown to conform with the numerical results. The code has been used to calculate the radiation pulse energy emitted into the central cone of undulator for various comb beam configurations. |
| Databáze: | OpenAIRE |
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