| Paper |
Title |
Page |
| THP020 |
Microbunching Enhancement by Adiabatic Trapping |
635 |
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- X.J. Deng, W.-H. Huang, C.-X. Tang
TUB, Beijing, People’s Republic of China
- A. Chao
SLAC, Menlo Park, California, USA
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Storage ring based concept called steady-state microbunching was proposed years ago for high average power narrowband coherent radiation generation. There are now active efforts on-going by the SSMB collaboration established among Tsinghua University and several other institutes. In this paper we study the particle trap and filamentation process of beam in RF or Micro Bucket which is useful for understanding the injection beam dynamics of SSMB. One remarkable result is the steady-state current distribution after full filamentation has little dependence on the bucket height as long as it is several times larger than the energy spread. A discrete increase of bucket height can boost the bunching, with the sacrifice of emittance growth. An adiabatic change of bucket height from a smaller value to the final desired value is then proposed to boost the bunching while preserving the longitudinal emittance.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-FEL2019-THP020
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| About • |
paper received ※ 20 August 2019 paper accepted ※ 28 August 2019 issue date ※ 05 November 2019 |
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| THP022 |
A General Optimization Method for High Harmonic Generation Beamline |
638 |
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- Y. Zhang, X.J. Deng, W.-H. Huang, Z. Pan, C.-X. Tang
TUB, Beijing, People’s Republic of China
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Shorter bunches produce a more coherent radiation and contain higher harmonic components. Here, based on transverse and longitudinal phase space coupling, a general method for analyzing the production of very short beam and searching for compression beamline is presented. With this method, several beamlines are found and optimized. The electron beam can be compressed to tens of nanometers, generating coherent high harmonic radiation.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-FEL2019-THP022
|
|
| About • |
paper received ※ 20 August 2019 paper accepted ※ 29 August 2019 issue date ※ 05 November 2019 |
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| THP055 |
A Storage Ring Design for Steady-State Microbunching to Generate Coherent EUV Light Source |
700 |
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- Z. Pan, X.J. Deng, W.-H. Huang, T. Rui, C.-X. Tang, Y. Zhang
TUB, Beijing, People’s Republic of China
- A. Chao
SLAC, Menlo Park, California, USA
- W. Wan
ShanghaiTech University, Shanghai, People’s Republic of China
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The proposal of Steady State Microbunching (SSMB) makes it available to generate high average power coherent radiation, especially has the potential to generate kW level of EUV source for lithography. In order to achieve and maintain SSMB, we propose several concepts. One is that a very short electron bunch below 100 nm is stored in the ring, inserting a strong focusing part to compress the bunch to ~3 nm, then radiating coherently, which is called longitudinal strong focusing (LSF) scheme. We have optimized the candidate lattice to achieve the very short electron bunch storage and microbunching for electron beam. The tracking results show the equilibrium length of the electron bunch is about 400 nm and no particles lose after 4.3 damping time while only single-particle effect is considered. More optimization and some new design based on the simulation results are still implementing.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-FEL2019-THP055
|
|
| About • |
paper received ※ 19 August 2019 paper accepted ※ 26 August 2019 issue date ※ 05 November 2019 |
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