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    請使用永久網址來引用或連結此文件: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/27699

    題名: Performance and characteristics of a prototype symmetric hybrid adjustable phase undulator
    作者: Hwang, C. S.;Chang, C. H.;Fan, T. C.;Lin, F. Y.;Wang, Ch.;Yeh, Shuting;Chang, H. P.;Hsu, K. T.;Chang, L. H.;鄭伯昆;Tseng, P. K.;Uen, T. M.
    貢獻者: 淡江大學物理學系
    日期: 1997-11-11
    上傳時間: 2009-12-31 10:38:21 (UTC+8)
    出版者: Elsevier
    摘要: In this work, we construct and measure a prototype symmetric Hybrid Adjustable Phase Undulator (HAPU) with nine poles to compare phase change and gap change in terms of their features and performances. HAPU can also provide the different characteristics between the pure and hybrid adjustable phase undulator. The HAPU has been installed in the Synchrotron Radiation Research Center (SRRC) storage ring to test the performance of the beam dynamics and photon flux behavior. A three-orthogonal Hall probe and a long-loop-coil measurement system are also implemented to take the field measurements. The multipole field and electron trajectory correction are made by shimming, the magic finger, and the active end pole coil corrector.

    After the field measurements, the vertical integral strength of HAPU is markedly smaller than that of the Hybrid Adjustable Gap Undulator (HAGU) and confirm that no obvious distinction arises between HAPU and HAGU in terms of the spectrum flux. The electron beam dynamic performance in the storage ring indicates that the vertical tune shift of HAPU is three times smaller than that of HAGU. Meanwhile, the energy dynamic tuning with the digital global feedback turned on, the photon position and flux in the bending chamber beam line is invariant. In addition, the injection efficiency remains unaffected at any phase position and the electron beam lifetime does not change when HAPU is in the dynamic tuning.
    關聯: Nuclear Instruments and Methods in Physics Research Section A 399(2-3), pp.463-476
    DOI: 10.1016/S0168-9002(97)00966-2
    顯示於類別:[物理學系暨研究所] 期刊論文


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