Author: Potylitsyn, A.
Paper Title Page
MOPPP005 Feasibility of THz Source Based on Coherent Smith-Purcell Radiation Generated by Femtosecond Electron Bunches in Super-Radiant Regime 574
  • L.G. Sukhikh, K.P. Artyomov, A. Potylitsyn
    Tomsk Polytechnic University, Tomsk, Russia
  • A.S. Aryshev, J. Urakawa
    KEK, Ibaraki, Japan
  • V. Karataev
    JAI, Egham, Surrey, United Kingdom
  Nowadays there is a big interest to THz radiation that is a promising tool for investigations in material science, in biology, medicine and other fields. THz radiation for users is mostly produced by Light Sources that are big and complex machines. Because of this there are numerous activities in research and development of a compact THz source. One of the trends is based on using different types of radiation generated in coherent regime by short electron bunches. The promising radiation mechanism is coherent Smith-Purcell radiation (CSPR) that has monochromatic angular distribution and that is generated while the bunch travels in a vicinity of a grating. In this report we present simulated characteristics of frequency-locked coherent Smith-Purcell radiation (super-radiant regime) generated by a train of short (hundreds of femtosecond) 10 MeV electron bunches with THz spacing. The simulations are performed for different grating profiles and parameters using existing CSPR models and Particle-in-Cell simulation code. We also discuss the feasibility of the THz source based on CSPR and status of the experiment that is prepared at LUCX facility at KEK after the upgrade.  
MOPPR019 Beam Profile Imaging Based on Backward Transition Radiation in the Extreme Ultraviolet Region 819
  • L.G. Sukhikh, S. Bajt, G. Kube
    DESY, Hamburg, Germany
  • W. Lauth
    IKP, Mainz, Germany
  • Yu.A. Popov, A. Potylitsyn
    Tomsk Polytechnic University, Tomsk, Russia
  Backward transition radiation (BTR) in the optical spectral region is widely used for beam profile diagnostics in modern electron linacs. However, the experience from linac based light sources shows that BTR diagnostics might fail because of coherence effects in the emission process. To overcome this problem of coherent emission it was proposed to use BTR in the extreme ultraviolet (EUV) region*, and measurements of the angular EUV BTR distribution were presented in Ref. **. This contribution summarizes the results of a beam profile imaging experiment using EUV BTR. The experiment was carried out using the 855 MeV electron beam of the Mainz Microtron MAMI. EUV BTR was generated at a molybdenum target deposited onto a silicon substrate, and imaging was realized using a spherical multilayer mirror which was optimized for a wavelength of 19 nm. Preliminary results will be presented and compared to ordinary optical BTR imaging together with a discussion of future possibilities of the proposed diagnostic method.
* L.G. Sukhikh et al., Nucl. Instrum. Methods A623, 567 (2010).
** L.G. Sukhikh et al., Proc. of DIPAC-2011, Hamburg (Germany), 544 (2011).