A camera for coherent diffractive imaging and holography with a soft-X-ray free electron laser

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We describe a camera to record coherent scattering patterns with a soft-X-ray free-electron laser. The camera consists of a laterally-graded multilayer mirror which reflects the diffraction pattern onto a CCD detector. The mirror acts as a bandpass filter both for wavelength and angle, which isolates the desired scattering pattern from non-sample scattering or incoherent emission from the sample. The mirror also solves the particular problem of the extreme intensity of the FEL pulses, which are focused to greater than 10{sup 14} W/cm{sup 2}. The strong undiffracted pulse passes through a hole in the mirror and propagates on to a beam ... continued below

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Bajt, S; Chapman, H N; Spiller, E; Alameda, J; Woods, B; Frank, M et al. September 24, 2007.

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Description

We describe a camera to record coherent scattering patterns with a soft-X-ray free-electron laser. The camera consists of a laterally-graded multilayer mirror which reflects the diffraction pattern onto a CCD detector. The mirror acts as a bandpass filter both for wavelength and angle, which isolates the desired scattering pattern from non-sample scattering or incoherent emission from the sample. The mirror also solves the particular problem of the extreme intensity of the FEL pulses, which are focused to greater than 10{sup 14} W/cm{sup 2}. The strong undiffracted pulse passes through a hole in the mirror and propagates on to a beam dump at a distance behind the instrument rather than interacting with a beamstop placed near the CCD. The camera concept is extendable for the full range of the fundamental wavelength of the FLASH FEL (i.e. between 6 nm and 60 nm) and into the water window. We have fabricated and tested various multilayer mirrors for wavelengths of 32 nm, 16 nm, 13.5 nm, and 4.5 nm. At the shorter wavelengths mirror roughness must be minimized to reduce scattering from the mirror. We have recorded over 30,000 diffraction patterns at the FLASH free-electron laser with no observable mirror damage or degradation of performance.

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PDF-file: 37 pages; size: 1.3 Mbytes

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  • Journal Name: Applied Optics, vol. 47, no. 10, January 3, 2008, pp. 1673 - 1683; Journal Volume: 47; Journal Issue: 10

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  • Report No.: UCRL-JRNL-235064
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 991815
  • Archival Resource Key: ark:/67531/metadc1014018

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • September 24, 2007

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  • Oct. 14, 2017, 8:36 a.m.

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  • Oct. 27, 2017, 5:32 p.m.

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Bajt, S; Chapman, H N; Spiller, E; Alameda, J; Woods, B; Frank, M et al. A camera for coherent diffractive imaging and holography with a soft-X-ray free electron laser, article, September 24, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc1014018/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.