The LBL 55-meter spherical grating monochromator at SSRL (Stanford Synchrotron Radiation Laboratory)
- Lawrence Berkeley Lab., CA (USA)
- Stanford Univ., CA (USA). Stanford Synchrotron Radiation Lab.
The Lawrence Berkeley Laboratory 55-m spherical grating monochromator (SGM) beamline is located as a branch line of the 54-pole wiggler/undulator at the Stanford Synchrotron Radiation Laboratory (SSRL). It was designed and constructed by LBL's Center for X-Ray Optics and the engineering staff of LBL's Advanced Light Source with the cooperation and assistance of the research group of David Shirley at LBL and the staff of SSRL. The main goals of the project were to test the SGM concept and to develop a capability for designing and building a water-cooled mirror and grating capability in anticipation of the ALS. A water-cooled plane mirror deflects the beam horizontally, taking in general a small fraction of the flux from the 54-pole insertion device. This mirror is a brazed assembly of Glidcop (a proprietary alumina-dispersion-strengthened copper alloy) and OFHC copper. Its surface was finished in polished electroless nickel, then overcoated with gold as all optics in the beamline are overcoated. Next in the line is a fused silica toroid which focuses the SPEAR source vertically onto the entrance slit of the monochromator and horizontally onto the nominal position of the exit slit, in the manner of Rense and Violett. The magnification factors are 0.3x vertically and 0.7x horizontally. The monochromator is a Rowland-circle design; both slits move on large granite-based slides that maintain flatness of travel to {plus minus}2 {mu}m in peak-to-peak variation from straightness.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- AC03-76SF00098; AC03-82ER13000
- OSTI ID:
- 6802531
- Report Number(s):
- LBL-28379; CONF-890802-32; ON: DE91000250
- Resource Relation:
- Conference: 1989 synchrotron radiation instrumentation (SRI-6) national conference, Berkeley, CA (USA), 6-10 Aug 1989
- Country of Publication:
- United States
- Language:
- English
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