Author: Assoufid, L.
Paper Title Page
TUOA01 Surface Twist Characterization and Compensation of an Elliptically Bent Hard X-Ray Mirror 99
 
  • Z. Qiao, J.W.J. Anton, L. Assoufid, S.P. Kearney, S.T. Mashrafi, J. Qian, X. Shi, D. Shu
    ANL, Lemont, Illinois, USA
 
  Funding: Work supported by the U.S. Department of Energy, Office of Science under Control DE-AC02-06CH11357
Deformable optics, including mechanically-bent and bimorph mirrors, are essential optical elements for X-ray beam dynamical focusing and wavefront correction. Existing mechanical bender technology often suffers from poor repeatability and does not include twist compensation. We recently developed an elliptically bent mirror based on a laminar flexure bending mechanism that yielded promising results*,**. In this work, the mirror surface twist was characterized using a Fizeau interferometer under different bending conditions. By applying a shimming correction, the surface twist was successfully reduced from 50 urad to 1.5 urad. The twist angle variation from no bending to the maximum bending is less than 0.5 urad. Our simulation results show that these numbers are significantly lower than the required values to ensure optimum optical performance. The study demonstrates the effectiveness of the twist compensation procedures and validates the mirror bender design parameters.
*Shu, D. et al., AIP Conference Proceedings. Vol. 2054. No. 1, 2019.
**Anton, Jayson WJ et al., Optomechanical Engineering 2019. Vol. 11100, 2019.
 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-TUOA01  
About • paper received ※ 29 July 2021       paper accepted ※ 14 October 2021       issue date ※ 28 October 2021  
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TUOA02 Conceptual Design of the Cavity Mechanical System for Cavity-Based X-Ray Free Electron Laser 103
 
  • D. Shu, J.W.J. Anton, L. Assoufid, W.G. Jansma, S.P. Kearney, K.-J. Kim, R.R. Lindberg, S.T. Mashrafi, X. Shi, Yu. Shvyd’ko, W.F. Toter, M. White
    ANL, Lemont, Illinois, USA
  • H. Bassan, F.-J. Decker, G.L. Gassner, Z. Huang, G. Marcus, H.-D. Nuhn, T.-F. Tan, D. Zhu
    SLAC, Menlo Park, California, USA
 
  Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract DE-AC02-06CH1 1357 (ANL) and DE-AC02-76SF00515 (SLAC).
The concept behind the cavity-based X-ray FELs (CBXFELs) such as the X-ray free-electron laser oscillator (XFELO)* and the X-ray regenerative amplifier free-electron laser (XRAFEL)** is to form an X-ray cavity with a set of narrow bandwidth diamond Bragg crystals. Storing and recirculating the output of an amplifier in an X- ray cavity so that the X-ray pulse can interact with following fresh electron bunches over many passes enables the development of full temporal coherence. One of the key challenges to forming the X-ray cavity is the precision of the cavity mechanical system design and construction. In this paper, we present conceptual design of the cavity mechanical system that is currently under development for use in a proof-of-principle cavity-based X-ray free electron laser experiment at the LCLS-II at SLAC.
*Kwang-Je Kim et al., TUPRB096, Proceedings of IPAC2019
**Gabe Marcus et al., TUD04, Proceedings of IPAC2019
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-TUOA02  
About • paper received ※ 02 August 2021       paper accepted ※ 05 October 2021       issue date ※ 30 October 2021  
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TUPC10 Modular Nanopositioning Flexure Stages Development for APS Upgrade K-B Mirror Nanofocusing Optics 199
 
  • D. Shu, J.W.J. Anton, L. Assoufid, S.J. Bean, D. Capatina, V. De Andrade, E.M. Dufresne, T. Graber, R. Harder, D. Haskel, K. Jasionowski, S.P. Kearney, A.A. Khan, B. Lai, W. Liu, J. Maser, S.T. Mashrafi, G.K. Mistri, S. Narayanan, C.A. Preissner, M. Ramanathan, L. Rebuffi, R. Reininger, O.A. Schmidt, X. Shi, J.Z. Tischler, K.J. Wakefield, D. Walko, J. Wang, X. Zhang
    ANL, Lemont, Illinois, USA
 
  Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
Kirkpatrick and Baez (K-B) mirror-based nanofocusing optics* will be applied to many beamlines endstation instruments for the APS-Upgrade (APS-U) project. Precision nanopositioning stages with nanometer-scale linear positioning resolution and nanoradian-scale angular stability are needed as alignment apparatus for the K-B mirror hard X-ray nanofocusing optics. For instance, at the APS-U 19-ID In Situ Nanoprobe beamline endstation**, to maintain stability of a 20-nm focal spot on the sample, nanofocusing K-B mirror system with 5-nrad angular stability is required. Similar angular resolution and stability are also required for APS-U 9-ID CSSI***, APS-U 34-ID ATOMIC**** and other beamline endstation instruments. Modular nanopositioning flexure stages have been developed for the K-B mirror nanofocusing optics, which includes: linear vertical and horizontal flexure stages, tip-tilting flexure stages, and flexure mirror benders for bendable nanofocusing K-B mirrors, to overcome the performance limitations of precision ball-bearing-based or roller-bearing-based stage systems. The mechanical design and preliminary test results are described in this paper.
* Kirkpartrick and Baez, JOSA. 1948; 38(9): 766-773.
** S. Kearney et al., this conference.
*** J. Anton et al., this conference.
**** C. Preissner et al., this conference.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-TUPC10  
About • paper received ※ 02 August 2021       paper accepted ※ 21 October 2021       issue date ※ 31 October 2021  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)