Optically controlled laser-plasma electron accelerator for compact gamma-ray sources

被引:6
作者
Kalmykov, S. Y. [1 ]
Davoine, X. [2 ]
Ghebregziabher, I. [3 ]
Shadwick, B. A. [1 ]
机构
[1] Univ Nebraska, Dept Phys & Astron, Lincoln, NE 68588 USA
[2] CEA, DAM, DIF, F-91297 Arpajon, France
[3] Penn State Univ, Hazleton, PA 18202 USA
来源
NEW JOURNAL OF PHYSICS | 2018年 / 20卷
基金
美国国家科学基金会;
关键词
laser wakefield accelerator; blowout; optical control of injection; comb-like electron beams; pulse stacking; negative chirp; inverse Compton/Thomson scattering; NONLINEAR THOMSON SCATTERING; COMPTON-SCATTERING; INTENSE; BEAMS; FEMTOSECOND; ULTRAINTENSE; GENERATION; 2-COLOR; SYSTEM; PULSES;
D O I
10.1088/1367-2630/aaad57
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Generating quasi-monochromatic, femtosecond gamma-ray pulses via Thomson scattering (TS) demands exceptional electron beam (e-beam) quality, such as percent-scale energy spread and five-dimensional brightness over 10(16) A m(-2). We show that near-GeV e-beams with these metrics can be accelerated in a cavity of electron density, driven with an incoherent stack of Joule-scale laser pulses through a mm-size, dense plasma (n(0) similar to 10(19) cm(-3)). Changing the time delay, frequency difference, and energy ratio of the stack components controls the e-beam phase space on the femtosecond scale, while the modest energy of the optical driver helps afford kHz-scale repetition rate at manageable average power. Blue-shifting one stack component by a considerable fraction of the carrier frequency makes the stack immune to self-compression. This, in turn, minimizes uncontrolled variation in the cavity shape, suppressing continuous injection of ambient plasma electrons, preserving a single, ultra-bright electron bunch. In addition, weak focusing of the trailing component of the stack induces periodic injection, generating, in a single shot, a train of bunches with controllable energy spacing and femtosecond synchronization. These designer e-beams, inaccessible to conventional acceleration methods, generate, via TS, gigawatt gamma-ray pulses (or multi-color pulse trains) with the mean energy in the range of interest for nuclear photonics (4-16 MeV), containing over 10(6) photons within a microsteradian-scale observation cone.
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页数:22
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