Author: Huang, X.
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MOPOW022 Model-based Algorithm to Tune the LCLS Optics 763
  • Z. Zhang
    TUB, Beijing, People's Republic of China
  • Y. Ding, X. Huang
    SLAC, Menlo Park, California, USA
  Transverse phase space matching of electron beam to the undulator optics is important for achieving good performance in free-electron lasers. Usually there are dedicated matching quadrupoles distributed in the beamline, by measuring the beam phase space the matching quadrupoles are calculated and adjusted to match to the designed Twiss parameters. Further adjustment of the quadrupoles to overcome collective effects or realistic beamline errors is typically required for performance improvement. In this paper, we studied a method to decompose the Twiss parameters for an independent control of the phase space. Mathematical analysis and numerical simulations are both presented to show that through combining the quadrupoles into some multi-knobs, we can control the Twiss parameters independently. We also show some experimental results at the LCLS.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOW022  
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TUXB01 High Power Radiation Sources using the Steady-state Microbunching Mechanism 1048
  • A. Chao, E. Granados, X. Huang, D.F. Ratner
    SLAC, Menlo Park, California, USA
  • H.W. Luo
    NTHU, Hsinchu, Taiwan
  The mechanism of steady-state microbunching (SSMB) was proposed for providing high power coherent radiation using electron storage rings. The mechanism follows closely the RF bunching in conventional storage rings, except that the energy modulation of by an RF system at a microwave wavelength is replaced by a seeded laser in an undulator at an optical wavelength. No FEL mechanism, and thus no FEL energy heating, is invoked. The basic idea is firstly to make the beam microbunched so that its radiation becomes coherent, and secondly to make the microbunching a steady state so that the coherent radiation is maintained at every turn. The combination of the high repetition rate of a storage ring and the enhanced radiation power by a factor of N (the number of electrons in the microbunches within one coherence length) opens the possibility as well as challenges of very high power SSMB sources. To explore its potential reach, we apply SSMB to the infrared, deep ultraviolet and EUV regions and estimate their respective power levels using SPEAR3 as example. Several variants of the SSMB schemes are discussed. A proof-of-principle configuration without an identified testbed is also suggested.  
slides icon Slides TUXB01 [1.602 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUXB01  
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