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Home > Press > CAS to set up a free electron laser facility in Shanghai

A scheme map of SXFEL at the campus of the Shanghai Synchrotron Radiation Facility.
A scheme map of SXFEL at the campus of the Shanghai Synchrotron Radiation Facility.

Abstract:
CAS has decided to establish, as pre-research engineering projects for a hard X-ray free-electron laser (FEL) facility in the future, a soft X-ray FEL (SXFEL) experiment facility and an RF superconducting accelerator unit, according to a presentation made by Prof. ZHAO Zhentang, vice director-general of the CAS Shanghai Institute of Applied Physics (SINAP), at the 122nd session of the Eastern Forum of Science and Technology held on 11 and 12 December in Shanghai.

CAS to set up a free electron laser facility in Shanghai

Beijing, China | Posted on December 24th, 2008

Using a relativistic electron beam as its working medium, FEL is a new kind of laser source that amplifies electromagnetic radiation via stimulated emissions in a periodic magnetic field. It is considered as an operational technical approach to the fourth-generation light sources as it has the widest frequency range of any laser type with high brightness and short pulses, and can be widely tunable.

Key technologies concerning the development of hard X-ray FEL facilities are highly challenging and very expensive. Therefore, all of the three such facilities now under construction in the world (LCLS in US, EURO-XFEL in Europe, and SCSS in Japan), were started with soft X-ray FEL.

A study on FEL test facility was initiated by a group of the CAS Institute of High Energy Physics (IHEP) in 2005, and such a kind of FEL R&D had been proposed by Prof. C. N. Yang, 1957 Nobel laureate in physics, in 1997, according to Prof. ZHAO, who is vice principal investigator of a research project on FEL with support from the National Basic Research Program.

After long discussions within the experts in Chinese physics community, CAS decided in 2007 to choose the Shanghai Synchrotron Radiation Facility campus as the facility site of SXFEL test facility and SINAP as its host institute. Its design and construction will be implemented under the close collaborations among IHEP, Tsinghua University and SINAP. Right now, a proposal for SXFEL is under the government's review.

The future SXFEL will be a 10nm two-stage cascading high gain and harmonic generation (HGHG) FEL demonstrator for performing the "proof of principle" of the cascading HGHG FEL and prototyping the key FEL technologies toward the HGHG based X-ray FEL, notes Prof. Zhao.

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About Chinese Academy of Sciences
CAS strives to build itself into a scientific research base at advanced international level, a base for fostering and bringing up advanced S&T talents, and a base for promoting the development of China's high and new technology industries. By 2010, CAS will have about 80 national institutes noted for their powerful capacities in S&T innovation and sustainable development or with distinctive features; thirty of them will become internationally acknowledged, high-level research institutions, and three to five will be world class.

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Chief-Editor's Information:
Guo Haiyan
the Editor
Bulletin of Chinese Academy of Sciences
CAS Institute of Policy & Management,
P.O.Box 8712, Beijing 100080, China.

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