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Proceedings Paper

Necessity of precise in-house adjustment for synchrotron radiation monochromator
Author(s): Shinan Qian; Giovanni Sostero; Cocco Daniele
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Paper Abstract

A Variable included Angle Spherical Grating Monochromator was installed on beam line at ELE1TRA in Italy. This unique monochromator is capable of high resolving power. For certain combinations of energy range and grating, resolving powers in excess of 20,000 are theoretically possible. To achieve these high resolving powers, precise mechanical alignment of all internal components is a necessity. Parallelism of rotation axes and optical surfaces must be better than 10 arc seconds, and position errors in locating components are required to be in the range of 10 microns. During the final alignment of this monochromator on the beam line, it was found to have errors 50 times larger than the specifications. Realignment of the internal components was necessary to improve the instrument performance. A penta-prism method was suggested and an autocollimator test method was used to correct parallelism between components in the monochromator while on the beam line. However, it is recommended to prealign and check the monochromator accurately in the optical metrology laboratory prior to the final beam line alignment. This two-stage procedure will ultimately save time and allow the beam line to achieve the highest possible performance in the shortest amount of time.

Paper Details

Date Published: 3 November 1997
PDF: 7 pages
Proc. SPIE 3150, Gratings and Grating Monochromators for Synchrotron Radiation, (3 November 1997); doi: 10.1117/12.292729
Show Author Affiliations
Shinan Qian, Sincrotrone Trieste (Italy) and Brookhaven National Lab. (United States)
Giovanni Sostero, Sincrotrone Trieste (Italy)
Cocco Daniele, Sincrotrone Trieste (Italy)


Published in SPIE Proceedings Vol. 3150:
Gratings and Grating Monochromators for Synchrotron Radiation
Wayne R. McKinney; Christopher A. Palmer, Editor(s)

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