Volume 7 Issue 1
Jan.  2014
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SONG Yuan, LU Qi-peng, PENG Zhong-qi, GONG Xue-peng. Effects of plane mirror thermal load on variable included angle plane-grating monochromator resolution[J]. Chinese Optics, 2014, 7(1): 105-111. doi: 10.3788/CO.20140701.0105
Citation: SONG Yuan, LU Qi-peng, PENG Zhong-qi, GONG Xue-peng. Effects of plane mirror thermal load on variable included angle plane-grating monochromator resolution[J]. Chinese Optics, 2014, 7(1): 105-111. doi: 10.3788/CO.20140701.0105

Effects of plane mirror thermal load on variable included angle plane-grating monochromator resolution

doi: 10.3788/CO.20140701.0105
  • Received Date: 11 Sep 2013
  • Rev Recd Date: 13 Dec 2013
  • Publish Date: 25 Jan 2014
  • In synchrotron radiation beamlines, the increasing light flux will lead to more thermal load on optical elements. The thermal load on the Plane Mirror(PM) of variable included angle plane-grating monochromator will decrease the resolution. This paper proposes a method to recover the resolution by optimizing the value of focusing constant(Cff). Firstly, the absorption spectra of thermal power with different values of Cff are obtained by calculation. Then thermo-mechanical analysis of PM is conducted to get variable deformations on PM with different thermal power. Secondly, the resolution is calculated by combining the function of ideal resolution and the software of ray tracing. Finally, the resolution is compensated by optimizing Cff. The result indicates that taking the soft X-ray spectroscopy micro beam line station of SSRF for example, the resolution can be improved by changing the value of Cff from 1.8 to 1.84 when the photon energy is 1 000 eV. So optimizing the value of Cff is an effective way to recover the decreased resolution induced by thermal power on PM.

     

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