25 October 2016 New scheme to control x-ray deformable mirrors
Author Affiliations +
Abstract
Over the past decade, the concept of x-ray Deformable Mirror (DM) has matured from early experimental stages to a standard tool now available at many synchrotron/free-electron laser facilities. Indeed, x-ray active optics has become an integral part of all present and future large x-ray and EUV projects and will be essential in exploiting the full potential of the new sources currently under construction. These DMs mainly are employed to correct wavefront errors or provide variable x-ray beam sizes. Due to the coupling between the N actuators of a DM, it is usually necessary to perform a calibration or training step to be able to control the DM to the right target. To determine the optimum actuators settings in order to minimize slope/height errors, an initial measurement need to be collected, with all actuators set to 0 and then either N or 2N measurements are necessary. In this work, we present a fast and accurate method to drive an x-ray active bimorph mirror to a target shape with only 3 or 4 measurements. Instead of sequentially measuring and calculating the influence functions of all actuators and then predicting the needed voltages for any desired shape, we make use of the metrology data to directly guide the mirror from current status towards the particular target slope/shape via iterative compensations. The feedback for the iteration process is the discrepancy in curvature determined by height/slope measurement data. Experiments demonstrate the feasibility of this simple approach.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Lei Huang, Lei Huang, Mourad Idir, Mourad Idir, "New scheme to control x-ray deformable mirrors", Proc. SPIE 9687, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Subnanometer Accuracy Measurement for Synchrotron Optics and X-Ray Optics, 968704 (25 October 2016); doi: 10.1117/12.2241522; https://doi.org/10.1117/12.2241522
PROCEEDINGS
11 PAGES


SHARE
RELATED CONTENT

Test results for an AOA Xinetics grazing incidence x ray...
Proceedings of SPIE (September 16 2014)
Adaptive x-ray optics development at AOA-Xinetics
Proceedings of SPIE (May 02 2013)
Control x-ray deformable mirrors with few measurements
Proceedings of SPIE (September 07 2016)
New Design Of Mirror Bending Block
Proceedings of SPIE (May 02 1982)
Adaptive x-ray optics development at AOA-Xinetics
Proceedings of SPIE (October 14 2012)

Back to Top