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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/28053


    Title: Photon spectrum characteristics and magnetic field performance of the prototype hybrid symmetry undulator magnet in SRRC
    Authors: Hwang, C. S.;Chang, C. H.;Lin, F. Y.;Fan, T. C.;Yeh, Shu-ting;Wang, Ch.;鄭伯昆;Tseng, P. K.;Uen, T. M.
    Contributors: 淡江大學物理學系
    Date: 1997-10
    Issue Date: 2009-12-31 11:00:49 (UTC+8)
    Publisher: 中華民國物理學會
    Abstract: A prototype Halbach hybrid magnet structure undulator with period of 10 cm was used to achieve a high magnetic field. A nearly sinusoidal magnetic field strength of 0.964 Tesla at 24 mm gap was achieved. The magnetic field was also designed and calculated using the magneto-static 3-D code of ”TOSCA”. According to those results, the field uniformity was better than 0.1% in the field rolloff range of x = ±10 mm at 24 mm gap. The real field profile was measured to find the magnetic field behavior and the photon energy spectrum characteristics. In addition, field distributions obtained from the field measurement and simulation were used to calculate the phcton spectrum characteristic. After the multipole and spectrum shimming, the good field region was controlled within 100 G.cm in the range of -2 cm ≤ x ≤ 2 cm to increase the dynamic aperture. A maximum phase error around 5.5 degrees was achieved and then maintained a high flux in the higher harmonic spectrum. The photon flux intensity is very close to the value of the ideal field simulation, which is about 1015 photons/sec/100mA/0.1%BW. The energy range of the first harmonic ranges from 5.2 to 220 eV and the higher harmonic energy can reach 1 KeV. The electron trajectory deviation was controlled to within 5 μm to maintain a constant optical axis and satisfy the beam dynamic requirements.
    Relation: Chinese Journal of Physics=中國物理學刊 35(5),頁617-630
    Appears in Collections:[物理學系暨研究所] 期刊論文

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