Paper |
Title |
Page |
TUPWO034 |
Focusing Magnetic Field Design for a FEL Linac |
1949 |
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- Q.S. Chen, Q. Fu, T. Hu, B. Qin, B. Wu, H. Zeng
HUST, Wuhan, People's Republic of China
- J. Li, Y.J. Pei
USTC/NSRL, Hefei, Anhui, People's Republic of China
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A linac-based Free Electron Laser is planned to be built in Huazhong University of Science and Technology (HUST). As an important part of the whole project, the focusing magnetic field is carefully designed. Space-charge force is calculated at first to give a rough evaluation about the focusing field. Start-to-end simulation shows that the magnetic field has only great effect on spot size and phase space. With the final designed field, 10-ps-length pulse containing 200pC electrons can be got and the corresponding RMS emittance and RMS radius are 7 πmm•mrad and 0.25 mm, respectively. Finally, a new idea (double-peak scheme) is discussed and excitation current is proposed as the evaluation index.
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TUPWO035 |
Physical Design of Beam Transport Line of a Compact Terahertz FEL |
1952 |
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- H. Zeng, Q.S. Chen, Q. Fu, B. Qin, B. Wu, Y.Q. Xiong
HUST, Wuhan, People's Republic of China
- G. Feng, Y.J. Pei
USTC/NSRL, Hefei, Anhui, People's Republic of China
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The single pass, linac-based compact terahertz source at HUST is now in the physical design stage. To match Twiss parameters and dispersion function of the electron beam at the undulator entrance and get smaller beta function in the whole line, several lattices based on the double bending achromat(DBA) structure were discussed and the optimized design is given with beam dynamics results–calculated by MAD and Trace 3D.
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WEPWA038 |
Influence of Magnet Errors and Waveguide Permeability on Magnetic Field Performance in Pure Permanent Undulators |
2214 |
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- X. Liu, K.F. Liu, B. Qin, P. Tan, B. Wu, Y.Q. Xiong, J. Yang, L. Yang
HUST, Wuhan, People's Republic of China
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Abstract For pure permanent magnet (PM) undulator, unavoidable divergences of remanence field and magnetization vector in PM blocks and installation error will cause magnetic field error at the central line of the undulator. This paper presents the simulation results of the magnetic field in non-ideal undulator containing these errors, with specified tolerances in Normal distribution. As well as the peak field error, increases of the harmonic components and impact on field integrals are calculated. The influence on magnetic field caused by waveguide permeability is also discussed.
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