Knot Undulator to Generate Linearly Polarized Photons with Low on-Axis Power Density

Qiao, S. ; /Stanford U., Appl. Phys. Dept. /SLAC, SSRL /LBNL, ALS /Fudan U. ; Ma, De-wei ; Feng, Dong-lai ; U., /Fudan ; Hussain, Z. ; /LBNL, ALS ; Shen, Z.-X. ; /Stanford U., Appl. Phys. Dept. /SLAC, SSRL

Stanford Linear Accelerator Center

关键词: Synchrotron Radiation;    Photons;    43 Particle Accelerators;    Permanent Magnets;    Power Density;   

DOI  :  10.2172/957413
RP-ID  :  SLAC-PUB-13687
RP-ID  :  AC02-76SF00515
RP-ID  :  957413

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来源: UNT Digital Library

【 摘 要 】

Heat load on beamline optics is a serious problem to generate pure linearly polarized photons in the third generation synchrotron radiation facilities. For permanent magnet undulators, this problem can be overcome by a figure-8 operating mode. But there is still no good method to tackle this problem for electromagnetic elliptical undulators. Here, a novel operating mode is suggested, which can generate pure linearly polarized photons with very low on-axis heat load. Also the available minimum photon energy of linearly polarized photons can be extended much by this method.