FEL2013 - Table of Session: MOICNO (Beam Physics)

Paper

Title

Page

Generation of a Train of Short Pulses by Means of FEL Emission of a Combed Electron Beam

2

V. Petrillo
Universita' degli Studi di Milano, Milano, Italy
M.P. Anania, M. Bellaveglia, E. Chiadroni, D. Di Giovenale, G. Di Pirro, M. Ferrario, G. Gatti, R. Pompili, C. Vaccarezza, F. Villa
INFN/LNF, Frascati (Roma), Italy
M. Artioli
ENEA-Bologna, Bologna, Italy
A. Bacci, A.R. Rossi
Istituto Nazionale di Fisica Nucleare, Milano, Italy
A. Cianchi
Università di Roma II Tor Vergata, Roma, Italy
F. Ciocci, G. Dattoli, L. Giannessi, A. Petralia, M. Quattromini, C. Ronsivalle, E. Sabia
ENEA C.R. Frascati, Frascati (Roma), Italy
A. Mostacci
Rome University La Sapienza, Roma, Italy
P. Musumeci
UCLA, Los Angeles, California, USA
J.V. Rau
ISM-CNR, Rome, Italy

We present a direct and powerful method for generating train of radiation pulses based on the FEL radiation from a multi-peaked electron beam produced with a combed laser pulse accelerated and compressed in a linac by the velocity bunching technique. The electron beam, constituted by two bunches, can be extracted from the accelerating section when they are temporaly superimposed but separated in energy, so that each of them is characterized by a different value of the Lorentz factor. When driven in the FEL undulator, they emit two separate spectral lines, according to the FEL resonance condition, that interfere producing fringes in the time-domain. In this way a train of regular pulses can be obtained, without limitation in frequency, and with the perspective of reaching the attosecond domain in the X ray regime.

Slides MOICNO01 [8.836 MB]

MOICNO02

Control of Electron Beam Longitudinal Phase Space With a Novel Compact De-chirper for PAL-XFEL

H.-S. Kang, M.S. Chae, T. Ha, J.H. Hong, W.W. Lee, S.J. Park, H. Yang
PAL, Pohang, Kyungbuk, Republic of Korea

The PAL-XFEL adopts a de-chirper system to remove the residual beam chirps with wakefield in corrugated pipes for the soft X-ray FEL line which is branched at 3 GeV point of the 10-GeV linac and does not have enough length of accelerating structures. The corrugated structure which is about 20 m long is designed to have the rectangular geometry and adjust the gap from 2 to 30 mm. We carried out the elegant code simulations using the wake formulas of G. Stupakov and K. Bane for the rectangular geometry to find the optimum parameters of corrugation using longitudinal wakes as well as to find the tolerance of vertical offset using transverse wakes. A 1-m long test de-chirper module is being designed and will be tested experimentally in July 2013 at the injector test facility in Pohang Accelerator Laboratory, which is a collaborative R&D with LBNL and SLAC.
Recommended by Zhirong Huang

Slides MOICNO02 [10.661 MB]

Paper	Title	Page
MOICNO01	Generation of a Train of Short Pulses by Means of FEL Emission of a Combed Electron Beam	2
	V. Petrillo Universita' degli Studi di Milano, Milano, Italy M.P. Anania, M. Bellaveglia, E. Chiadroni, D. Di Giovenale, G. Di Pirro, M. Ferrario, G. Gatti, R. Pompili, C. Vaccarezza, F. Villa INFN/LNF, Frascati (Roma), Italy M. Artioli ENEA-Bologna, Bologna, Italy A. Bacci, A.R. Rossi Istituto Nazionale di Fisica Nucleare, Milano, Italy A. Cianchi Università di Roma II Tor Vergata, Roma, Italy F. Ciocci, G. Dattoli, L. Giannessi, A. Petralia, M. Quattromini, C. Ronsivalle, E. Sabia ENEA C.R. Frascati, Frascati (Roma), Italy A. Mostacci Rome University La Sapienza, Roma, Italy P. Musumeci UCLA, Los Angeles, California, USA J.V. Rau ISM-CNR, Rome, Italy
	We present a direct and powerful method for generating train of radiation pulses based on the FEL radiation from a multi-peaked electron beam produced with a combed laser pulse accelerated and compressed in a linac by the velocity bunching technique. The electron beam, constituted by two bunches, can be extracted from the accelerating section when they are temporaly superimposed but separated in energy, so that each of them is characterized by a different value of the Lorentz factor. When driven in the FEL undulator, they emit two separate spectral lines, according to the FEL resonance condition, that interfere producing fringes in the time-domain. In this way a train of regular pulses can be obtained, without limitation in frequency, and with the perspective of reaching the attosecond domain in the X ray regime.
	Slides MOICNO01 [8.836 MB]

MOICNO02	Control of Electron Beam Longitudinal Phase Space With a Novel Compact De-chirper for PAL-XFEL
	H.-S. Kang, M.S. Chae, T. Ha, J.H. Hong, W.W. Lee, S.J. Park, H. Yang PAL, Pohang, Kyungbuk, Republic of Korea
	The PAL-XFEL adopts a de-chirper system to remove the residual beam chirps with wakefield in corrugated pipes for the soft X-ray FEL line which is branched at 3 GeV point of the 10-GeV linac and does not have enough length of accelerating structures. The corrugated structure which is about 20 m long is designed to have the rectangular geometry and adjust the gap from 2 to 30 mm. We carried out the elegant code simulations using the wake formulas of G. Stupakov and K. Bane for the rectangular geometry to find the optimum parameters of corrugation using longitudinal wakes as well as to find the tolerance of vertical offset using transverse wakes. A 1-m long test de-chirper module is being designed and will be tested experimentally in July 2013 at the injector test facility in Pohang Accelerator Laboratory, which is a collaborative R&D with LBNL and SLAC. Recommended by Zhirong Huang
	Slides MOICNO02 [10.661 MB]