scholarly journals Multiple-Collision Free-Electron Laser Compton Backscattering for a High-Yield Gamma-Ray Source

2020 ◽  
Vol 10 (4) ◽  
pp. 1418
Author(s):  
Norihiro Sei ◽  
Hiroshi Ogawa ◽  
QiKa Jia

We observed multiple-collision free-electron laser (FEL)-Compton backscattering in which a multi-bunch electron beam makes head-on collisions with multi-pulse FELs in an optical cavity, using an infrared FEL system in the storage ring NIJI-IV. It was demonstrated that the measured spectrum of the multiple-collision FEL-Compton backscattering gamma rays was the summation of the spectra of the gamma rays generated at each collision point. Moreover, it was demonstrated that the spatial distribution of the multiple-collision FEL-Compton backscattering gamma rays was the summation of those of the gamma rays generated at each collision point. Our experimental results proved quantitatively that the multiple collisions in the FEL-Compton backscattering process are effective in increasing the yield of the gamma rays. By applying the multiple-collision FEL-Compton backscattering to high-repetition FEL devices such as energy recovery linac FELs, an unprecedented high-yield gamma-ray source with quasi-monochromaticity and wavelength tunability will be realized.

2013 ◽  
Vol 79 (6) ◽  
pp. 995-998 ◽  
Author(s):  
BENGT ELIASSON ◽  
CHUAN SHENG LIU

AbstractWe present a theoretical model for the generation of coherent gamma rays by a free electron laser, where a high-energy electron beam interacts with an electromagnetic wiggler. By replacing the static undulator with a 1-μm laser wiggler, the resulting radiation would go from X-rays currently observed in experiments, to gamma rays. Coherent light in the gamma-ray range would have wide-ranging applications in the probing of matter on sub-atomic scales.


1996 ◽  
Vol 77 (15) ◽  
pp. 3130-3132 ◽  
Author(s):  
F. Glotin ◽  
J.-M. Ortega ◽  
R. Prazeres ◽  
G. Devanz ◽  
O. Marcouillé

2014 ◽  
Vol 27 ◽  
pp. 1460152
Author(s):  
D. FLECHAS ◽  
L.G. SARMIENTO ◽  
F. CRISTANCHO ◽  
E. FAJARDO

A gamma-backscattering imaging device dubbed Compton Camera, developed at GSI (Darmstadt, Germany) and modified and studied at the Nuclear Physics Group of the National University of Colombia in Bogotá, uses the back-to-back emission of two gamma rays in the positron annihilation to construct a bidimensional image that represents the distribution of matter in the field-of-view of the camera. This imaging capability can be used in a host of different situations, for example, to identify and study deposition and structural defects, and to help locating concealed objects, to name just two cases. In order to increase the understanding of the response of the Compton Camera and, in particular, its image formation process, and to assist in the data analysis, a simulation of the camera was developed using the GEANT4 simulation toolkit. In this work, the images resulting from different experimental conditions are shown. The simulated images and their comparison with the experimental ones already suggest methods to improve the present experimental device


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