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Nicoletti, D.

Paper Title Page
MOPD090 Upgrade and Evaluation of the Bunch Compression Monitor at the Free-electron Laser in Hamburg (FLASH) 912
 
  • C. Behrens, B. Schmidt, S. Wesch
    DESY, Hamburg
  • D. Nicoletti
    Università di Roma I La Sapienza, Roma
 
 

The control and stabilization of RF systems for accelerators has a considerable importance. In case of high-gain free-electron lasers (FEL) with magnetic bunch compressors, the RF phases determine the attainable bunch peak current, which is a relevant parameter for driving the FEL process. In order to measure the bunch peak current in a simple and fast but indirect way, both bunch compressors at FLASH are equipped with compression monitors (BCM) based on pyroelectrical detectors and diffraction radiators (CDR). They provide substantial information to tune the bunch compression and are used for beam-based feedback to stabilize RF phases. This monitor system becomes more important and more challenging after the installation of a third-harmonic RF system for longitudinal phase space linearization in front of the first bunch compressor. In this paper, we describe the hardware upgrade of the bunch compression monitor and show the expected performance by simulations of the CDR source and the radiation transport optics. Particle tracking simulations are used for generation of the simulated BCM-signal for various compression schemes. Comparison with experimental data will be presented.

 
TUOARA03 Characterization of the THz Source at SPARC 1296
 
  • E. Chiadroni, F. A. Anelli, M. Bellaveglia, M. Boscolo, M. Castellano, L. Cultrera, G. Di Pirro, M. Ferrario, L. Ficcadenti, D. Filippetto, S. Fioravanti, G. Gatti, E. Pace, R.S. Sorchetti, C. Vaccarezza
    INFN/LNF, Frascati (Roma)
  • A. Bacci, A.R. Rossi
    Istituto Nazionale di Fisica Nucleare, Milano
  • P. Calvani, S. Lupi, D. Nicoletti
    Università di Roma I La Sapienza, Roma
  • L. Catani, B. Marchetti
    INFN-Roma II, Roma
  • A. Cianchi
    Università di Roma II Tor Vergata, Roma
  • O. Limaj
    University of Rome La Sapienza, Rome
  • A. Mostacci
    Rome University La Sapienza, Roma
  • C. Ronsivalle
    ENEA C.R. Frascati, Frascati (Roma)
 
 

The region of the spectrum from 0.3 to 5 THz is of great interest for several experiments in different areas of research. A THz radiation source can be produced at SPARC as coherent transition radiation emitted by either a compressed or longitudinally modulated beam intercepting a metal foil placed at 45° with respect to the beam propagation. Results on the characterization of the THz source at SPARC are described in the paper.

 

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