| Paper |
Title |
Page |
| TUPC077 |
The 100-MeV Beam Diagnostic Station for the FERMI Linac
|
1230 |
| |
- G. Penco, S. Di Mitri, S. Spampinati
ELETTRA, Basovizza, Trieste
|
|
| |
In order to transversally match the beam coming out from the injector to the FERMI@Elettra linac lattice, a beam diagnostic station will be placed at 100 MeV. It is equipped with quadrupoles and Optical Transition Radiation (OTR) screens to measure and correct the beam Twiss parameters and to evaluate the transverse emittances through a three-screen technique. Moreover, the second OTR screen is placed close to the laser heater undulator to guarantee that the eletron/photon interaction is achieved at the beam waist. Design optimization studies and simulation results are presented in this paper.
|
|
| TUPP033 |
Alternative Scheme of Bunch Length Compression in Linacs for Free Electron Lasers
|
1610 |
| |
- S. Di Mitri, M. Cornacchia, S. V. Milton, S. Spampinati
ELETTRA, Basovizza, Trieste
|
|
| |
The aim of this paper is to investigate the effect of an alternative scheme of bunch compression on the development of the microbunching instability. Two cases have been considered, one in the presence of a linear energy chirp at the compressor end and another without it. It is shown that after removing the linear energy chirp, a properly tuned R56 transport matrix element is able to dilute the initial energy modulation without affecting the bunch length and to damp the associated current spikes. A by-product of this study indicates that the global compression scheme can be further optimized in the direction of a double compression scheme in which the longitudinal Landau damping is enhanced by increasing the compression factor of the first compressor while reducing that of the second one. The limiting case of such a configuration is the single compression scheme at low energy. The study is based on analytical calculations and on the simulation code LiTrack.
|
|