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Sökning: WFRF:(Kubsky S.)

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1.
  • Engblom, C., et al. (författare)
  • Overview of some feedback-&control systems at synchrotron SolEIL
  • 2016
  • Ingår i: Proceedings of the 11th International Workshop on Personal Computers and Particle Accelerator Controls, PCaPAC 2016. - 9783954501892 ; , s. 132-136
  • Konferensbidrag (refereegranskat)abstract
    • This paper gives an overview of some feedback & control systems at Synchrotron SOLEIL that are in use or in development today. Beam stability is crucial and adressed in all SOLEIL aspects; Fast Orbit Feedback is a multi-input multi-output control system made to stabilize beam position perturbations in the low- & high frequency band. In addition, active RF cavities are used to maintain stable beam energy & spread as well as keeping electron density even throughout the storage ring. Beam stability also comes from feedforward non-linear control in particle trajectory compensation on both sides of electromagnetic undulators. On some beamlines, multi-actuator piezos or pneumatics are used to regulate photon flux to keep within detector operating range; a method to maximize the photon flux while still keeping below detector damage thresholds. Currently in development & at the sample stage level, the Nanoprobe Project collaboration (MAXIV & SOLEIL) focuses on sample stabilization during step- & fly- scans which is realized through multi-axis nano-positioning with high- & low- frequency closed-loop control implementing interferometer feedback &/or compensation tables.
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2.
  • Vogt, Ulrich, et al. (författare)
  • Moiré method for nanometer instability investigation of scanning hard x-ray microscopes
  • 2017
  • Ingår i: Optics Express. - : Optical Society of America. - 1094-4087. ; 25:11, s. 12188-12194
  • Tidskriftsartikel (refereegranskat)abstract
    • We present a Moiré method that can be used to investigate positional instabilities in a scanning hard x-ray microscope with nanometer precision. The development of diffractionlimited storage rings offering highly-brilliant synchrotron radiation and improvements of nanofocusing x-ray optics paves the way towards 3D nanotomography with 10 nm resolution or below. However, this trend demands improved designs of x-ray microscope instruments which should offer few-nm beam stabilities with respect to the sample. Our technique can measure the position of optics and sample stage relative to each other in the two directions perpendicular to the beam propagation in a scanning x-ray microscope using simple optical components and visible light. The usefulness of the method was proven by measuring short and long term instabilities of a zone-plate-optics-based prototype microscope. We think it can become an important tool for the characterization of scanning x-ray microscopes, especially prior to experiments with an actual x-ray beam.
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