Comparison of Non-Redundant Array and Double Pinhole Coherence Measurements with Soft X-rays

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Experiments on the future Linac Coherent Light Source (LCLS) and other Free Electron Lasers will need to be performed on a single-shot basis. The double pinhole method of measuring spatial coherence requires a separate measurement, with a different pinhole separation distance, for each length scale sampled. This limits its utility for LCLS. A potential alternative uses a Non-Redundant Array (NRA) of apertures designed to probe the coherence over the range of length scales defined by their physical extent, in a single measurement. This approach was tested by comparing diffraction patterns from soft x-rays incident on double pinhole and NRA absorption ... continued below

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12 pages

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Weil, Gabriel & /SLAC, /Northwestern U. September 11, 2006.

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Description

Experiments on the future Linac Coherent Light Source (LCLS) and other Free Electron Lasers will need to be performed on a single-shot basis. The double pinhole method of measuring spatial coherence requires a separate measurement, with a different pinhole separation distance, for each length scale sampled. This limits its utility for LCLS. A potential alternative uses a Non-Redundant Array (NRA) of apertures designed to probe the coherence over the range of length scales defined by their physical extent, in a single measurement. This approach was tested by comparing diffraction patterns from soft x-rays incident on double pinhole and NRA absorption mask structures. The double pinhole fringe visibility data serve as discrete reference points that verify the continuous spectrum of the NRA coherence data. The results present a quantitative analysis of the double pinhole coherence measurements and a qualitative comparison to the NRA images.

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12 pages

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  • Report No.: SLAC-TN-06-029
  • Grant Number: AC02-76SF00515
  • DOI: 10.2172/908223 | External Link
  • Office of Scientific & Technical Information Report Number: 908223
  • Archival Resource Key: ark:/67531/metadc877168

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  • September 11, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 6, 2016, 7:50 p.m.

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Weil, Gabriel & /SLAC, /Northwestern U. Comparison of Non-Redundant Array and Double Pinhole Coherence Measurements with Soft X-rays, report, September 11, 2006; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc877168/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.