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injection

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TUPPH008 Beam Dynamics Studies on the UVSOR-II Free Electron Laser laser, electron, synchrotron, simulation 236
 
  • M.-E. Couprie
    SOLEIL, Gif-sur-Yvette
  • M. Hosaka
    Nagoya University, Nagoya
  • M. Katoh, A. Mochihashi, M. Shimada
    UVSOR, Okazaki
  • G. Lambert
    RIKEN Spring-8, Hyogo
  • M. Labat
    CEA, Gif-sur-Yvette
  In the Coherent Harmonic Generation Free Electron Laser configuration, an external laser source is seeded inside a first undulator. The interaction between the electron beam and this seed induces energy modulation of the bunch, further converted into a density modulation, producing coherent radiation in a second undulator. The energy modulation enhances the energy spread of the electron bunch, converted by the machine optics into a modification of its longitudinal distribution. In the case of a storage ring FEL, the electrons are re-circulating: the same bunch keeps interacting with the seeded laser, and relaxation of the distribution is only allowed in between two laser injections. Such specific dynamics has been studied on the CHG FEL of UVSOR-II storage ring (Japan). The electron beam stored at 600 MeV is seeded using a 2.5 mJ, 1 kHz, 1.2 ps Ti:Sa laser at 800 nm wavelength, allowing radiation at 266 nm (third harmonic). A Streak Camera is used to record the evolution of the longitudinal profiles as a function of the repetition rate and average power of the seeding laser, leading to bunch lengthening and distortion dynamical analysis. It appeared that because the heating induced by the interaction remains local, the refreshment process of the electronic distribution is modified. The experimental results are compared to simulations using SYNC.  
 
TUPPH015 Diffraction Effects in the Coherent Transition Radiation Bunch Length Diagnostics electron, radiation, diagnostics, photon 256
 
  • V. A. Lebedev, S. Nagaitsev, G. M. Kazakevich
    Fermilab, Batavia, Illinois
  Diffraction effects in the Coherent Transition Radiation (CTR) bunch length diagnostics were considered for the A0 Photoinjector and the ILC injection module. The effects can cause a noticeable distortion of the measured CTR spectra dependently on the experimental setup and the bunch parameters. The distortion results in the the errors of the bunch length determination. Presented calculations show possible errors in determination of the bunch length in assumed experiments based on the CTR spectra measurements at A0 Photo injector and the ILC injection module.  
 
WEPPH043 The UCSB MM-FEL Injection Locking System laser, free-electron-laser, electron, coupling 445
 
  • S. Takahashi, G. J. Ramian
    UCSB, Santa Barbara, California
  An Injection locking system has been implemented on UCSB's Millimeter Wave FEL at 240 GHz. It it is based on a VDI varactor multiplier source and a Keating quasi-optical isolator. Its purpose is to stabilize lasing and suppress mode beating by always forcing lasing to occur at a single frequency on one specific longitudinal mode. Theoretical and experimental results are presented.