Figure (a) Experimentally measured (530-580 MeV) high-quality electron beam energy and divergence angle distribution; (b) High-quality electron beam energy map corresponding to (a); (c) Six-dimensional phase space of electron beam Brightness B6D,n, comparable to the world's most advanced linear accelerator.

Recently, Xu Zhizhan, Academician of the Chinese Academy of Sciences and the researcher Li Ruxin, of the State Key Laboratory of Laser Field Physics, Chinese Academy of Sciences, Shanghai Institute of Optics and Fine Mechanics led the research team to obtain high-brightness, high-quality electron beams accelerated by super-ultra-short laser driven wake fields. Breakthrough progress. The research team proposed a new solution for cascading wake field acceleration. It breaks through the major technical bottlenecks such as the difficulty of laser energy dispersion in acceleration of the wake field acceleration, and obtains high-luminosity and high-quality high-energy electron beams. The electron beam six-dimensional phase space The brightness reaches 10^15-16A/m^2/0.1%, which is much higher than the results of similar researches reported in the world at present. For the first time in the world, the brightness of electron beams available on the most advanced linac is approaching. The results of the relevant study were published on the Physical Review Letters 117, 124801 (2016) on September 16th, and were selected as "bright point papers."

The development of miniaturized, low-cost laser particle accelerators has always been a scientist's dream. The super-ultra-short laser-driven wake field electron accelerator has three or more orders of magnitude higher acceleration gradients than conventional radio frequency accelerators, providing a new technological approach to miniaturized high-energy particle accelerators, etc. Synchrotron radiation devices, free electron lasers, and high-energy physics research have had profound effects. In the past ten years, many important advances have been made in the study of laser tail wave field electron acceleration. However, there are still many challenges and challenges in the generation of high-quality electron beams, such as energy divergence compression and stability enhancement, and their application in research. restricted.

In recent years, the research team of the Shanghai Institute of Optics and Technology of the Chinese Academy of Sciences has carried out unique research in the direction of electron acceleration of the laser wake field. For the first time in the world, the cascaded double-tailed wave field quasi-single energy high-energy electron acceleration scheme has been successfully achieved. The experiment has obtained GeV. Important research results such as quasi-single energy electron beams (Phys. Rev. Lett. 107, 035001 (2011); Appl. Phys. Lett. 103, 243501 (2013)). In this study, the researchers also innovatively designed a new solution for cascading wake field acceleration. By introducing a high-density plasma between two cascaded plasmas, the phase-locked acceleration and energy of the electron beam are controlled.啾Reversal and energy divergence compression overcomes the technical bottleneck that the divergence cannot be independently controlled in the single-stage wake field acceleration scheme. The experiment has obtained high quality (200-600 MeV, energy dispersive 0.4-1.2%, and flow intensity 1). High-energy electron beams of -8 kA, divergence angle ∼0.2 rms mrad). The comprehensive improvement of all important performance indicators of the electron beam makes the highest six-dimensional phase space brightness of the electron beam reach 6.5×10^15 A/m^2/0.1%, which is much higher than the results of similar researches reported in the world at present, and it is also a laser electron. Accelerated the first time in the world that the most advanced linac can obtain the beam brightness. The three-dimensional particle simulation also reveals that the new cascade acceleration scheme can effectively suppress the secondary injection of electrons, achieve stable phase acceleration of the electron beam, and obtain low energy divergence and low divergence by controlling the energy enthalpy and compression energy divergence of the electron beam. High-brightness and high-quality electron beam with high angle and high current.

The reviewing experts gave a high evaluation of the results of the study: “The brightness is by far the highest record achieved by the laser wakefield accelerators”; “Compared with the previous scheme, this scheme properly controlled the self-injected electron beam through the high-density area. The phase of the injection ... and the energy of the electron beam can be compensated during the acceleration process ... is a new scheme that produces hundreds of MeV with one thousandth of a relatively high energy and high quality of charge Great progress has been made in high-brightness electron beams..."; "Utilizing the density distribution of optimized structures yields 200-600 MeV electron beams with low energy divergence and low divergence angles... The new method proposed achieves innovation. Recorded electron beam quality."

The high brightness and high energy electron beam obtained by this scheme has also been used in the production of inverse Compton scattering gamma rays. Ultra-high intensity quasi-monochromatic MeV gamma ray sources have been generated using this electron beam collided with a super-ultra-ultra-short laser, with a maximum peak luminance of 3×10^22 photons s^-1 mm^-2 mrad^- 2 0.1%BW, which is more than an order of magnitude higher than the luminance of the same gamma ray source reported internationally, which is 100,000 times higher than that of the traditional gamma ray source. The results of relevant studies have recently been published in Scientific Reports (6, 29518 (2016)).

The study was supported by the National Natural Science Foundation of China, the Ministry of Science and Technology, and the Chinese Academy of Sciences. At present, the research team is working on the development of a miniaturized all-optical free electron laser device. The use of this cascaded wakefield acceleration scheme to successfully generate high-brightness and high-energy electron beams will significantly promote the research process in miniaturized free electron lasers and other important fields.

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