Author: Ratner, D.F.
Paper Title Page
MOPJE062 Testing Aspects of Advanced Coherent Electron Cooling Technique 445
 
  • V. Litvinenko, Y.C. Jing, I. Pinayev, G. Wang
    BNL, Upton, Long Island, New York, USA
  • D.F. Ratner
    SLAC, Menlo Park, California, USA
  • V. Samulyak
    SBU, Stony Brook, USA
  
  An advanced version of the coherent-electron cooling based on the microbunching instability was proposed in *. This approach promised to significantly increase the bandwidth of the system and, therefore, significantly shorter cooling time in high energy hadron colliders. In this paper we present our plans of simulating and testing the key aspects of this proposed technique using the set-up of the coherent-electron-cooling proof-of-principle experiment at BNL.
* D.F. Ratner, Phys. Rev. Lett. 111, 084802 (2013)
 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPJE062  
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TUPJE074 LCLS Injector Laser Modulation to Improve FEL Operation Efficiency and Performance 1813
 
  • S. Li, D.K. Bohler, W.J. Corbett, A.S. Fisher, S. Gilevich, Z. Huang, A. Li, D.F. Ratner, J. Robinson, F. Zhou
    SLAC, Menlo Park, California, USA
  • R.B. Fiorito, E.J. Montgomery
    UMD, College Park, Maryland, USA
  • H.D. Zhang
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • H.D. Zhang
    The University of Liverpool, Liverpool, United Kingdom
  
  In the Linear Coherent Light Source (LCLS) at SLAC, the injector laser plays an important role as the source of the electron beam for the Free Electron Laser (FEL). The injector laser strikes a copper photocathode which emits photo-electrons due to photo-electric effect. The emittance of the electron beam is highly related to the transverse shape of the injector laser. Currently the LCLS injector laser has hot spots that degrade the FEL performance. The goal of this project is to use adaptive optics to modulate the transverse shape of the injector laser, in order to produce a desired shape of electron beam. With a more controllable electron transverse profile, we can achieve lower emittance for the FEL, improve the FEL performance and operation reliability. We first present various options for adaptive optics and damage test results. Then we will discuss the shaping process with an iterative algorithm to achieve the desired shape, characterized by Zernike polynomial deconstruction.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE074  
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