Considerations for a soft x-ray spectromicroscopy beamline
- State Univ. of New York, Stony Brook, NY (United States). Dept. of Physics; and others
The X-1A soft x-ray undulator at the NSLS is the source for the experimental programs in spectromicroscopy. The authors require both spatial and temporal coherence. Due to the relatively large horizontal divergence of the electron beam in the low {beta} straight section of the x-ray storage ring, it has been possible to split the beam using a scraping mirror into two branches: X-1A used by the authors` program and X-1B used for high resolution spectroscopy. They are now rebuilding the X-1A beamline to provide improved resolving power and essentially linear trade-off between photon rate at the zone plate and resolving power for the soft x-ray spectromicroscopy experiments. This new beamline will exploit both additional floorspace due to the NSLS building expansion and increases in the brightness of the x-ray ring. The beam will be further split into two separate beamlines, both of which will use toroidal mirrors to focus the source on the monochromator entrance slits horizontally and to focus on the monochromator exit slits vertically. This separation comes at no loss of coherent flux and permits low thermal loading on the optics, since the authors need little more than the coherent fraction of the beam at the Fresnel zone plate for microfocusing. Because of the small angular acceptance for spatially coherent illumination of the zone plates and the use of an approximately satisfied Rowland condition, the monochromators have sufficient resolving power with fixed exit arms. Experiments can then be placed near the exit slits, with spatial coherence established by the exit slit size. Resolving power will be controlled by adjusting the entrance slit alone with no change of spatial coherence. The zone plates will be overfilled to be less sensitive to beam vibration and drift.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 531521
- Report Number(s):
- CONF-960848-; ISBN 0-8194-2244-4; TRN: 97:017814
- Resource Relation:
- Conference: Denver `96: 1. conference on space processing of materials, at SPIE International Society for Optical Engineering (SPIE) annual international symposium on optical science, engineering, and instrumentation, Denver, CO (United States), 4-9 Aug 1996; Other Information: PBD: 1996; Related Information: Is Part Of Optics for high-brightness synchrotron radiation beamlines II; Berman, L.E. [ed.] [Brookhaven National Lab., Upton, NY (United States)]; Arthur, J. [ed.] [Stanford Univ., CA (United States)]|[European Synchrotron Radiation Facility, Grenoble (France)]; PB: 368 p.; Proceedings/SPIE, Volume 2856
- Country of Publication:
- United States
- Language:
- English
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