Sagitally focusing scanning monochromator produces 0. 4-mm focus (abstract)

Journal Article · Wed Jan 01 04:00:00 EST 1992 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1143783· OSTI ID:5646521

Rosenbaum, G; Sullivan, M; Fischetti, R ^[1]; Rock, L ^[2]

---

1. Biostructures Institute, University City Science Center, 3401 Market Street, Suite 320, Philadelphia, Pennsylvania 19104 (United States)
2. L. Rock Automation Associates, Cherry Hill, New Jersey 08003 (United States)

A sagitally focusing stage has been constructed for the double-crystal scanning monochromator on beam line X9-A at the NSLS which can be exchanged with the normally used flat crystal stage. The bending device located at 12.0 m from the source is designed to accept a beam up to 200-mm wide. The monochromator with bending stage can be scanned over Bragg angles from 10{degree} to 71{degree} corresponding to photon energies from 11.4 to 2.1 keV with Si-111 crystals. In conjunction with the vertically focusing mirror a point focus of 0.38 mm{times}0.18 mm (horizontal{times}vertical, full width at half maximum (FWHM) each) has been achieved at a focal length of 3.8 m (center of a four-circle diffractometer). Focused at the back of the experimental hutch (focal length=5.4 m) the focal size was 0.55 mm{times}0.30 mm. The measured horizontal width of the focus equals the calculated size of the demagnified source and is independent of the horizontal convergence used. The horizontal focus produced by the crystal is very clean: the full width at 1% of maximum is 1.5 mm and at 0.01% it is about 4 mm. The flux into the focus is 5{times}10{sup 11} photons/s at a photon energy of 7.4 keV and beam current of 200 mA.

• OSTI ID: 5646521
• Journal Information: Review of Scientific Instruments; (United States), Journal Name: Review of Scientific Instruments; (United States) Vol. 63:1; ISSN RSINA; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430303* -- Particle Accelerators-- Experimental Facilities & Equipment
ACCELERATORS
CYCLIC ACCELERATORS
DESIGN
DIFFRACTOMETERS
FOCUSING
MEASURING INSTRUMENTS
MIRRORS
MONOCHROMATORS
NSLS
RADIATION SOURCES
SYNCHROTRON RADIATION SOURCES
SYNCHROTRONS
X-RAY DIFFRACTOMETERS