Author: Hara, T.
Paper Title Page
MOPOW019 Commissioning Status of the Extreme-Ultraviolet FEL Facility at SACLA 757
  • T. Sakurai, T. Asaka, N. Azumi, T. Hara, T. Hasegawa, T. Inagaki, T. Ishikawa, R. Kinjo, C. Kondo, H. Maesaka, T. Ohshima, Y. Otake, H. Tanaka, T. Tanaka, K. Togawa
    RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
  • T. Bizen, N. Hosoda, H. Kimura, S. Matsubara, S. Matsui
    JASRI/SPring-8, Hyogo-ken, Japan
  To equip SACLA with wide ability to provide a laser beams in EUV and soft X-ray regions to experimental users, we have constructed a new free electron laser facility for SACLA beamline-1. Injector components, such as a thermionic electron gun, two buncher cavities, a S-band standing wave accelerator, S-band travelling wave accelerator and their RF sources, were relocated from the SCSS test accelerator, which was a prototype machine of SACLA. At the downstream of a bunch compressor chicane, three C-band 40 MV/m acceleration units were newly installed to effectively boost a beam energy up to 470 MeV. Two in-vacuum undulators were remodeled by changing the period of magnet array from 15 mm to 18 mm to increase SASE intensity by a larger K-value of 2.1. Beam commissioning was started in autumn 2015. So far SASE radiation at a 33 nm wavelength driven by a 470 MeV electron beam was observed. We will install the third undulator in this winter to obtain SASE saturation and additional C-band accelerator units in the next summer to raise the maximum beam energy to 750 MeV. In this presentation, the overview of the facility and the commissioning status will be reported.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOW019  
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TUOCB03 Magnet Development for SPring-8 Upgrade 1093
  • T. Watanabe, T. Aoki, K. Fukami, S. Matsubara, C. Mitsuda, S. Takano, T. Taniuchi, K. Tsumaki
    JASRI/SPring-8, Hyogo-ken, Japan
  • T. Hara, H. Kimura
    RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
  One of the features for newly designed magnets for the SPring-8 major upgrade plan* is permanent magnet based dipole magnets for substantial energy saving. The new dipole magnets have been designed to be equipped with (i) a field variable function by controlling magnetic flux into a beam axis, (ii) a nose structure on iron poles for smooth B-field transition in the longitudinal gradient field, and (iii) a nearly zero temperature coefficient of magnet circuit with the help of a shunt alloy**. Demagnetization due to radiation is also a critical issue. At SPring-8, demagnetization process has been intensively studied, and the effect has been considered in the design of dipole magnets. Although electromagnet based multi-pole magnets are rather conventional technologies, yet new magnets need to be designed to fit in the next generation high packing factor lattice with as reasonably lower energy consumption as possible. Magnet alignment will be a key development as well; in order to secure adequate dynamic apertures, magnets ought to be aligned within tens of microns. Current design and recent progress in the developments of magnets and alignment schemes will be presented.
* H. Tanaka et al., SPring-8 Upgrade Project, in the abstracts.
** T. Taniuchi et al., Proc. of IPAC2015, WEPMA050.
slides icon Slides TUOCB03 [4.014 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUOCB03  
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