Novel monochromator concept for sagittal micro-focusing of undulator radiation

Clemens Schulze-Briese; Gerd Heidenreich; Harry Auderset; Detlef Vermeulen; Andreas K. Freund

doi:10.1117/12.332502

11 December 1998 Novel monochromator concept for sagittal micro-focusing of undulator radiation

Clemens Schulze-Briese, Gerd Heidenreich, Harry Auderset, Detlef Vermeulen, Andreas K. Freund

Proceedings Volume 3448, Crystal and Multilayer Optics; (1998) https://doi.org/10.1117/12.332502
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

We present the design and test of a sagittally focusing crystal monochromator for the protein crystallography beamline of the Swiss Light Source (SLS) and discuss the limiting factors in sagittal micro-focusing of undulator radiation. The monochromator concept combines flexibility with stability and reproducibility, in particular for Multiple-wavelength Anomalous Dispersion (MAD) experiments. Together with a dynamically bent, vertically focusing mirror, it will accept the full central cone from the undulator and deliver a fixed- exit beam with adjustable focus size between 20 and 200 micrometer in the energy range of 7 - 17.5 keV. The characteristic feature of the crystal is a double step connecting the inner bent region with the outer stiff part. The crystal rests on one step (neutral layer) and by the other is kept in position relative to the bender without application of forces, thereby minimizing crystal deformations and alignment errors. Cylindrical bending is achieved by means of four motorized micrometer-screws which act directly on the stiff parts of the crystal. The bender was tested at ESRF and a beam of 6 X 1 mm² was focused to 20 micrometer at 10 keV. The efficiency was close to 90%. Dynamical focusing was demonstrated. Residual bending errors could be traced back to thickness variations of the bent crystal part.

Citation Download Citation

Clemens Schulze-Briese, Gerd Heidenreich, Harry Auderset, Detlef Vermeulen, and Andreas K. Freund "Novel monochromator concept for sagittal micro-focusing of undulator radiation", Proc. SPIE 3448, Crystal and Multilayer Optics, (11 December 1998); https://doi.org/10.1117/12.332502

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available