Characterization of a mechanical bender for x-ray mirrors at European XFEL

Idoia Freijo Martín; Maurizio Vannoni; Valerija Music; Harald Sinn

doi:10.1117/12.2238064

8 September 2016 Characterization of a mechanical bender for x-ray mirrors at European XFEL

Idoia Freijo Martín, Maurizio Vannoni, Valerija Music, Harald Sinn

Author Affiliations +

Proceedings Volume 9965, Adaptive X-Ray Optics IV; 996504 (2016) https://doi.org/10.1117/12.2238064
Event: SPIE Optical Engineering + Applications, 2016, San Diego, California, United States

Abstract

The European XFEL will generate extremely short and intense X-ray laser pulses of high coherence and nearly diffraction-limited divergence. Guiding these X-rays beams over a distance of more than 1 km to the experiments requires an extreme precision in pointing stability of beamline components like mirrors and gratings and also a control of the divergence of the beam. The specifications of the X-ray mirrors that will be able to transport, distribute and focus the beam are quite challenging. The European XFEL mirrors for the beam transport are 950 mm long and the optical surface specifications are 2 nm Peak-To-Valley. Some of the mirrors will have bending capabilities in order to focus the beam in the right position and with nanometer accuracy. This is implemented using a mechanical bender that will ensure stability of the optics in the nanometer range and will also offer the possibility to correct for mechanical or temperature drifts.

We present here the characterization of a mechanical bender that was done using two instruments, a Large Aperture Fizeau interferometer and a system of three capacitive sensors. The bender is designed in a way that the mirror is hold with clamps on both ends and a symmetric torque is applied on the clamps, inducing a cylindrical shape on the mirror surface. Several long-term stability measurements were done, as well as the characterization of bending capabilities. The parameters retrieved from the measurements are the sagitta and therefore the radius of curvature for different bending positions. The behavior of the variation of the shape of the mirror was also studied. The information gathered from our measurements will be used to optimize the final design of the bender.

Conference Presentation

Citation Download Citation

Idoia Freijo Martín, Maurizio Vannoni, Valerija Music, and Harald Sinn "Characterization of a mechanical bender for x-ray mirrors at European XFEL", Proc. SPIE 9965, Adaptive X-Ray Optics IV, 996504 (8 September 2016); https://doi.org/10.1117/12.2238064

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