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MOPE33 |
The Cooling Structure for the Cryogenic Permanent Magnet Undulator Prototype at SSRF |
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- Y. Liu, Y.Z. He, X. Hu, H.F. Wang, J. Wang, L. Wang, S.H. Wang, L. Yin, W. Zhang, Q.G. Zhou
SINAP, Shanghai, People’s Republic of China
- L. Zhang
SSRF, Shanghai, People’s Republic of China
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A cryogenic permanent magnet undulator (CPMU) prototype, based on the in-vacuum undulator technology, is under development at Shanghai Synchrotron Radiation Facility (SSRF). The prototype has a magnetic period length of 20 mm and effective peak field 1.04 T (gap 6 mm) at cryogenic temperature. The hybrid type magnetic assembly consists of NdFeB permanent magnet blocks and iron poles. A liquid nitrogen closed loop is adopted for cooling the magnet blocks to about 140 K. The cooling system is well designed to achieve a uniform temperature along the assembly and the temperature gradient is less than 1.5 K per meter. This paper presents the details of the cooling structure design for magnet blocks and iron poles, the mechanical structure of the copper-nickel foil with spring loaded tension mechanism and end tapers, as well as the test results off-line and on-line.
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| TUPE36 |
Ground Vibration Monitoring for SXFEL Construction at SSRF |
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- R.B. Deng, F. Gao, L. Yin
SINAP, Shanghai, People’s Republic of China
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Funding: Project supported by the National Natural Science Foundation of China (Grant No. 11405255)
Shanghai X-ray Free Electron Laser test facility (SXFEL) began construction on Dec.30 2014. It is quite important to monitor the ground vibration influenced by the construction at Shanghai Synchrotron Radiation Facility (SSRF), because the SXFEL is just in the north of SSRF and the nearest distance is only 20m. In this paper, the results of ground vibration measurement during the construction period at SSRF experimental hall, tunnel and experimental room near the SXFEL site are shown. Vibrations at different hours, frequency bands and directions are discussed to provide more detailed information on the influence of SXFEL construction to SSRF.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE36
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| About • |
paper received ※ 08 September 2016 paper accepted ※ 21 September 2016 issue date ※ 22 June 2017 |
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| TUPE38 |
Progress and Mechanical Engineering of FEL Projects at SINAP |
246 |
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- L. Yin, W. Fang, X. Hu, S. Sun, L. Wang, L.Y. Yu, W. Zhang
SINAP, Shanghai, People’s Republic of China
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Free electron laser (FEL) technology is the next focus at Shanghai Institute of Applied Physics (SINAP). Shanghai Deep Ultraviolet Free-Electron Laser (SDUV-FEL), a test facility for new FEL principles, was operated for 5 years and got a series of important results. Dalian Coherent Light Source (DCLS), a 50~150nm wavelength FEL user facility based on a 300MeV linac located at Dalian Institute of Chemical Physics, started beam commissioning in August. Shanghai X-ray Free-Electron Laser (SXFEL), a soft X-ray FEL test facility based on an 840MeV linac, will be installed in this month and the commissioning is scheduled at the beginning of 2017. The Progress of the FEL projects and the mechanical engineering in the design and construction are presented.
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Poster TUPE38 [8.096 MB]
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE38
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| About • |
paper received ※ 07 September 2016 paper accepted ※ 15 September 2016 issue date ※ 22 June 2017 |
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