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W. Luo,
W. Xu,
Q. Y. Pan,
X. Z. Cai,
Y. Z. Chen, G. T. Fan,
G. W. Fan,
Y. J. Li,
W. H. Liu,
G. Q. Lin,
Y. G. Ma,
W. Q. Shen,
X. C. Shi,
B. J. Xu,
J. Q. Xu,
Y. Xu,
H. O. Zhang,
Z. Yan,
L. F. Yang,
M. H. Zhao
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ABSTRACT: There is great interest in the generation of energy-tunable, bright, short-pulse X/γ-ray sources, which are required in various research fields. Laser–Compton scattering (LCS) is considered to be one of the
most promising methods to implement this kind of X/γ-ray source. At the 100-MeV LINAC of the Shanghai Institute of Applied Physics, a 2-J, 8-ns, 1064-nm, Q-switched Nd:YAG laser
is brought to a slanting collision at 40° (44°) with an 112-MeV, 0.9-ns (rms) relativistic electron beam. We measured the
LCS X-ray energy spectrum with a peak energy of 31.73±0.22stat±1.64systkeV and a peak width (rms) of 0.74±0.26stat±0.03systkeV. This preliminary investigation was carried out to understand the feasibility of developing an energy-tunable X/γ-ray source. Based on this study, the future Shanghai Laser Electron Gamma Source (SLEGS) at the Shanghai Synchrotron Radiation
Facility (SSRF) can be constructed to be not only an energy-tunable γ-ray source by guiding the laser incident angle from laser–Compton scattering, but also a high flux (∼1010photons/s or even higher) γ-ray source by adding a laser super-cavity.
Applied Physics B 04/2012; 101(4):761-771. · 2.19 Impact Factor
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L F Yang,
W Xu,
Q R Zhang, G T Fan,
X L Cai,
W Luo,
G W Fan,
Y J Li,
Qu Y Pan,
B J Xu,
Z Yan,
Z D An
[show abstract]
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ABSTRACT: Based on the non-relativistic theory and dipole approximation, we have developed a new program to study the interaction between a circularly polarized laser and hydrogen atoms. In this paper, we present our calculation of above-threshold ionization (ATI) rate based on the new code and compare the results with that of a pertubation theory calculation. The comparison shows that our non-perturbative calculations can produce ATI peak suppression.
Physica Scripta 06/2011; 2011(T144):014054. · 1.20 Impact Factor
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W Luo,
W Xu,
Q Y Pan,
X Z Cai,
J G Chen,
Y Z Chen, G T Fan,
G W Fan,
W Guo,
Y J Li, [......],
Y G Ma,
W Q Shen,
X C Shi,
B J Xu,
J Q Xu,
Y Xu,
H O Zhang,
Z Yan,
L F Yang,
M H Zhao
[show abstract]
[hide abstract]
ABSTRACT: As a prototype of the Shanghai Laser Electron Gamma Source in the Shanghai Synchrotron Radiation Facility, an x-ray source based on laser-Compton scattering (LCS) has been installed at the terminal of the 100 MeV linac of the Shanghai Institute of Applied Physics. LCS x-rays are generated by interactions between Q-switched Nd:yttrium aluminum garnet laser pulses [with wavelength of 1064 nm and pulse width of 21 ns (full width at half maximum)] and electron bunches [with energy of 108 MeV and pulse width of 0.95 ns (rms)] at an angle of 42 degrees between laser and electron beam. In order to measure the energy spectrum of LCS x-rays, a Si(Li) detector along the electron beam line axis is positioned at 9.8 m away from a LCS chamber. After background subtraction, the LCS x-ray spectrum with the peak energy of 29.1+/-4.4|(stat)+/-2.1|(syst) keV and the peak width (rms) of 7.8+/-2.8|(stat)+/-0.4|(syst) keV is observed. Normally the 100 MeV linac operates with the electron macropulse charge of 1.0 nC/pulse, and the electron and laser collision repetition rate of 20 Hz. Therefore, the total LCS x-ray flux of (5.2+/-2.0) x 10(2) Hz can be achieved.
The Review of scientific instruments 01/2010; 81(1):013304. · 1.52 Impact Factor
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J.G. Chen,
W. Xu,
H.W. Wang,
W. Guo,
Y.G. Ma,
X.Z. Cai,
G.C. Lu,
Y. Xu,
Q.Y. Pan, G.T. Fan,
W.Q. Shen
[show abstract]
[hide abstract]
ABSTRACT: We investigated the transmutation of some fission product nuclides , , , , , and , induced by the Compton backscattering (CBS) photons generated from the future Shanghai Laser Electron Gamma Source (SLEGS) facility. The evaluated photo-transmutation rates for , , , , , and can achieve 2.5×106, 1.3×106, 4.8×106, 2.7×106, 9.4×106, 1.3×106 and1.6×106 per second, respectively, improving 4–5 orders of magnitude compared with those via the bremsstrahlung photons by a laser. The maximum transmutation coupling efficiencies of the CBS photons were estimated to be 1.36% for , 1.70% for , 2.02% for , 1.03% for , 1.52% for , 1.62% for and 1.72% for , which are 2–6 times as those via the bremsstrahlung method by the laser. Moreover, we presented a possible experimental method for the future SLEGS facility to check the estimated results.
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 599(1):118-123. · 1.21 Impact Factor
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[show abstract]
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ABSTRACT: One of the main challenges for the laser-Compton scattering (LCS) experiments with the oblique configuration at the Linac of SINAP is the low signal to noise (S/N) ratio due to the low intensity of LCS signals. X-ray spectroscopy system mainly consisting of an X-ray Si(Li) detector, electronics, and LabVIEW-based data acquisition has been developed for the low S/N ratio experiments. Spectral characteristics of such a system (i.e., energy and time resolutions, data acquisition efficiency, and system instability) have been determined by the 55Fe, 241Am, and 238Pu radioactive sources. In order to extract the LCS X-ray spectrum, several methods for the enhancement of the S/N ratio have been achieved and data have been taken alternatively with laser pulse on and off. Thanks to these methods the S/N ratios have been optimized. Finally, the generated LCS X-ray spectrum has been achieved through the subtraction of the on/off laser accumulated spectra.
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 624(1):141-147. · 1.21 Impact Factor
