Researchers at the Shanghai Institute of Applied Physics, Chinese Academy of Sciences recently proposed a new mechanism based on the storage ring light source to generate high brightness, fully coherent radiation. The research shows that this operating mechanism can make full use of the characteristics of the storage ring electron beam and can greatly increase the performance of the storage ring light source by simpler device modification to generate the peak luminance X-ray pulses in the femtosecond order. Relevant research results were recently published online in the journal Nature Science (Science Reports 7: 4724 (2017)), a division of Nature Publishing Group.
The third generation of synchrotron light source based on the storage ring has become a major major science platform that supports basic and applied research in physics, chemistry, materials, medicine, life science and other disciplines. The third generation of synchrotron radiation light source has the advantages of high average brightness, stable pulse energy and multi-user operation. However, it is limited by the principle that it also has the shortcomings of low peak brightness, long pulse length and no coherence in the longitudinal direction. To overcome these shortcomings of storage ring light sources, people are developing X-ray free electron lasers. In the meantime, with the development of diffraction-limited storage ring light sources in recent years, people are beginning to explore the feasibility of generating fully coherent free-electron lasers based on storage rings and put forward some new solutions.
The researchers at Shanghai Institute of Applied Physics proposed a new electron beam steering mechanism based on the characteristics of storage rings and free electron lasers. This mechanism makes full use of the advantage that the divergence angle of electron bunches in the storage ring is very small in the vertical direction, In combination with the laser modulation method of the extrinsic free electron laser, the small divergence angle in the transverse direction can be converted into a micro-bunching beam with a small vertical dimension, thereby generating high-order harmonic radiation. Based on the existing conventional laser and magnet technology, with this new operating mechanism it is expected that radiation pulses in the vacuum deep UV and X-ray band with high repetition rate, ultra-short pulse and full coherence properties will be directly generated in the storage ring. Based on the storage ring, it provides a feasible technical route for ultra-fast pumping-detection experiments and high-resolution spectroscopy and imaging experiments, and also provides a new idea for the realization of free-standing storage-ring free-electron lasers. (Free Electron Laser Technology Feeds)
Schematic diagram of a vacuum-generated deep-UV and X-ray ultrashort radiation pulse based on a storage ring
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