Status of the SXFEL Facility

The Shanghai soft X-ray Free-Electron Laser facility (SXFEL) is being developed in two steps; the SXFEL test facility (SXFEL-TF), and the SXFEL user facility (SXFEL-UF). The SXFEL-TF is a critical development step towards the construction a soft X-ray FEL user facility in China, and is under commissioning at the Shanghai Synchrotron Radiation Facility (SSRF) campus. The test facility is going to generate 8.8 nm FEL radiation using an 840 MeV electron linac passing through the two-stage cascaded HGHG-HGHG or EEHG-HGHG (high-gain harmonic generation, echo-enabled harmonic generation) scheme. The construction of the SXFEL-TF started at the end of 2014. Its accelerator tunnel and klystron gallery were ready for equipment installation in April 2016, and the installation of the SXFEL-TF linac and radiator undulators were completed by the end of 2016. In the meantime, the SXFEL-UF, with a designated wavelength in the water window region, began construction in November 2016. This was based on upgrading the linac energy to 1.5 GeV, and the building of a second undulator line and five experimental end-stations. Construction status and the future plans of the SXFEL are reported in this paper.

[1]  J.H.Han,et al.  STATUS OF THE PAL-XFEL PROJECT , 2006 .

[2]  S. Reiche,et al.  GENESIS 1.3: a fully 3D time-dependent FEL simulation code , 1999 .

[3]  C. Feng,et al.  A single stage EEHG at SXFEL for narrow-bandwidth soft X-ray generation , 2016 .

[4]  A. M. Kondratenko,et al.  GENERATING OF COHERENT RADIATION BY A RELATIVISTIC ELECTRON BEAM IN AN ONDULATOR , 1980 .

[5]  STATUS OF THE PAL-XFEL PROJECT * , 2007 .

[6]  William A. Barletta,et al.  Highly coherent and stable pulses from the FERMI seeded free-electron laser in the extreme ultraviolet , 2012, Nature Photonics.

[7]  S. Y. Chen,et al.  DESIGN AND BEAM DYNAMICS SIMULATION FOR THE PHOTOINJECTOR OF SHANGHAI SOFT X − RAY FREE ELECTRON LASER TEST FACILITY , 2011 .

[8]  W. Schlotter,et al.  Experimental demonstration of a soft x-ray self-seeded free-electron laser. , 2015, Physical review letters.

[9]  Haixiao Deng,et al.  Phase-merging enhanced harmonic generation free-electron laser , 2013 .

[10]  Ryszard S. Romaniuk,et al.  Operation of a free-electron laser from the extreme ultraviolet to the water window , 2007 .

[11]  Gianluca Geloni,et al.  A novel self-seeding scheme for hard X-ray FELs , 2011 .

[12]  Z. S. Wang,et al.  First lasing of an echo-enabled harmonic generation free-electron laser , 2012, Nature Photonics.

[13]  G. Stupakov,et al.  Enhanced tunable narrow-band THz emission from laser-modulated electron beams , 2009 .

[14]  R. Lindberg,et al.  Demonstration of self-seeding in a hard-X-ray free-electron laser , 2012, Nature Photonics.

[15]  Claudio Pellegrini,et al.  Collective instabilities and high-gain regime in a free electron laser , 1984 .

[16]  M. Borland,et al.  Elegant : a flexible SDDS-compliant code for accelerator simulation. , 2000 .

[17]  W. B. Li,et al.  Demonstration of a widely-tunable and fully-coherent high-gain harmonic-generation free-electron laser , 2013 .

[18]  M. V. Yurkov,et al.  Possible application of X-ray optical elements for reducing the spectral bandwidth of an X-ray SASE FEL , 1997 .

[19]  Gianluca Geloni,et al.  The European X-ray Free-Electron Laser , 2015 .

[20]  Solomon,et al.  High-gain harmonic-generation free-electron laser , 2000, Science.

[21]  Shaukat Khan,et al.  Recent Results from FEL seeding at FLASH , 2015 .

[22]  G. Stupakov,et al.  Using the beam-echo effect for generation of short-wavelength radiation. , 2009, Physical review letters.

[23]  Haixiao Deng,et al.  Using off-resonance laser modulation for beam-energy-spread cooling in generation of short-wavelength radiation. , 2013, Physical review letters.

[24]  D. Ratner,et al.  First lasing and operation of an ångstrom-wavelength free-electron laser , 2010 .

[25]  Juhao Wu,et al.  Coherent hard X-ray production by cascading stages of High Gain Harmonic Generation , 2001 .

[26]  Yu,et al.  Generation of intense uv radiation by subharmonically seeded single-pass free-electron lasers. , 1991, Physical review. A, Atomic, molecular, and optical physics.

[27]  Giulio Gaio,et al.  Two-stage seeded soft-X-ray free-electron laser , 2013, Nature Photonics.

[28]  T. Ishikawa,et al.  A compact X-ray free-electron laser emitting in the sub-ångström region , 2012, Nature Photonics.