scholarly journals Suppression of microbunching instability with magnetic bunch length compression in a linac-based free electron laser

2010 ◽  
Vol 13 (1) ◽  
Author(s):  
S. Di Mitri ◽  
M. Cornacchia ◽  
S. Spampinati ◽  
S. Milton
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Bunch Length

scholarly journals How the optical timing system, the longitudinal diagnostics and the associated feedback systems provide femtosecond stable operation at the FERMI free electron laser

2016 ◽  
Vol 4 ◽  
Author(s):  
Mario Ferianis ◽  
Enrico Allaria ◽  
Eugenio Ferrari ◽  
Giulio Gaio ◽  
Giuseppe Penco ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Free Electron ◽  
Free Electron Laser ◽  
Bunch Length ◽  
Stable Phase ◽  
Stable Operation ◽  
Feedback Systems ◽  
Sensors And Actuators ◽  
Timing System

FERMI, the seeded free electron laser (FEL) in operation in Italy, is providing the User Community with unique fully coherent radiation, in the wavelength range 100–4 nm. FERMI is the first FEL fully synchronized by means of optical fibers. The optical timing system ensures an ultra-stable phase reference to its distributed clients. Several femtosecond longitudinal diagnostics verify the achieved performance; the bunch length monitor (BLM) and the bunch arrival monitor (BAM) will be presented in this paper. Feedback systems play a crucial role to guarantee the needed long-term electron beam stability. A real-time infrastructure allows shot-to-shot communication between front-end computers and the servers. Orbit feedbacks are useful in machine tuning, whereas longitudinal feedbacks control electron energy, compression and arrival time. A flexible software framework allows a rapid implementation of heterogeneous multi-input–multi-output (MIMO) longitudinal loops simply by selecting the appropriate sensors and actuators.

scholarly journals Electron-bunch lengthening on higher-harmonic oscillations in storage-ring free-electron lasers

2017 ◽  
Vol 24 (5) ◽  
pp. 912-918 ◽  
Author(s):  
Norihiro Sei ◽  
Hiroshi Ogawa ◽  
Shuichi Okuda
Keyword(s):  
Electron Beam ◽  
Storage Ring ◽  
Free Electron ◽  
Free Electron Laser ◽  
Cavity Length ◽  
Extreme Ultraviolet ◽  
Bunch Length ◽  
Free Electron Lasers ◽  
X Ray ◽  
Higher Harmonic

The influence of higher-harmonic free-electron laser (FEL) oscillations on an electron beam have been studied by measuring its bunch length at the NIJI-IV storage ring. The bunch length and the lifetime of the electron beam were measured, and were observed to have become longer owing to harmonic lasing, which is in accord with the increase of the FEL gain. It was demonstrated that the saturated FEL power could be described by the theory of bunch heating, even for the harmonic lasing. Cavity-length detuning curves were measured for the harmonic lasing, and it was found that the width of the detuning curve was proportional to a parameter that depended on the bunch length. These experimental results will be useful for developing compact resonator-type FELs by using higher harmonics in the extreme-ultraviolet and the X-ray regions.

FERMI@ELETTRA bunch compressor chicane mechanical design

2010 ◽  
Vol 1 (MEDSI-6) ◽  
Author(s):  
D. La Civita ◽  
G. Lanfranco ◽  
G. Pangon ◽  
D. Zangrando ◽  
C. Belliero ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Linear Accelerator ◽  
Mechanical Design ◽  
Bunch Length ◽  
Vacuum Chambers ◽  
Under Construction

The FERMI@ELETTRA Free-Electron-Laser (FEL) project at the ELETTRA Laboratory of Sincrotrone Trieste, currently under construction and commissioning, will comprise a linear accelerator and two FEL beamlines. Two identical magnetic chicanes for bunch length compression will be installed in the linear accelerator (LINAC) tunnel. The first bunch compressor, at 300 MeV, has been recently installed and commissioned while the production and installation plan of the second one (at 600 MeV) is being defined. The chicane mechanical design has been achieved in collaboration with the supplier, Rial Vacuum srl. In this paper, the chicane mechanical design and the movable vacuum chambers are presented.

scholarly journals Bunch length and energy measurements in the bunch compressor of a free-electron laser

2019 ◽  
Vol 22 (7) ◽  
Author(s):  
G. L. Orlandi ◽  
R. Xue ◽  
H. Brands ◽  
F. Frei ◽  
Z. Geng ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Bunch Length

FAR INFRARED FREE ELECTRON LASER

1983 ◽  
Vol 44 (C1) ◽  
pp. C1-385-C1-385
Author(s):  
E. D. Shaw ◽  
R. M. Emanuelson ◽  
G. A. Herbster
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Far Infrared

FULLY QUANTIZED MANY PARTICLE THEORY OF A FREE-ELECTRON LASER

1983 ◽  
Vol 44 (C1) ◽  
pp. C1-367-C1-367
Author(s):  
W. Becker ◽  
J. K. McIver
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Particle Theory

Effect of Chirality by the Free Electron Laser Irradiation

2010 ◽  
Vol 130 (2) ◽  
pp. 209-212 ◽  
Author(s):  
Daisuke Ishizuka ◽  
Keijiro Sakai ◽  
Nobuyuki Iwata ◽  
Hirofumi Yajima ◽  
Hiroshi Yamamoto
Keyword(s):  
Laser Irradiation ◽  
Free Electron ◽  
Free Electron Laser

X-Ray Free Electron Laser Facility for Next Generation of Scientific Exploration and Discovery

2011 ◽  
Vol 131 (2) ◽  
pp. 68-71
Author(s):  
Etsuo FUJIWARA ◽  
Eiichi ANAYAMA ◽  
Yuichiro KATSUTA ◽  
Toshiki IZUTANI ◽  
Daichi OKUHARA ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Next Generation ◽  
X Ray ◽  
Scientific Exploration ◽  
Laser Facility

X-ray Free Electron Laser SACLA

2014 ◽  
Vol 134 (12) ◽  
pp. 836-839
Author(s):  
Junichi INOUE ◽  
Yuji TANAKA ◽  
Yuki MATSUMOTO ◽  
Kensuke KANDA
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
X Ray
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