Kratky block-collimation small-angle x-ray diffractometer for synchrotron radiation

Technical Report · Wed Jul 01 04:00:00 EDT 1987

OSTI ID:5410376

Chu, B; Wu, D Q; Wu, C

A block-slit collimation system of the Kratky design concept was modified and adapted for synchrotron radiation. The building block small-angle x-ray diffractometer (SAXD) not only retains the essential advantages of the Kratky camera, i.e., accessibility at small values of q/bar=(4 pi/Lamda)sin(theta/2) with lambda and theta being the x-ray wavelength and the scattering angle, respectively and ease alignment, but also provides portability and low construction cost. With the SAXD operating at the SUNY X21A beamline of the National Synchrotron Light Source, we were able to reach theta about 1 mrad corresponding to q about 0.04/nm (or a Bragg spacing of 150nm) using an incident slit width (d) of 0.5 mm and lambda=0.15nm. At d=0.5mm, about 10% of the monochromatic synchrotron x-ray radiation passed through the block-collimation system and a parasitic intensity to main beam intensity ratio of about .00001 at theta=1 mrad was achieved. With d about 0.1 mm, it is anticipated that q about 0.01/nm can be accessible. By changing the vacuum-tube length between the sample chamber and the beam stop from about 1400 to about 200mm, we could reach an intermediate q range of about 0.04 somewhat < q somewhat < 10/nm using a 5-cm-long linear position-sensitive detector with a resolution of about 100 micrometers/channel. A description of the SAXD and its operation is presented.

• Research Organization: State Univ. of New York, Stony Brook (USA). Dept. of Chemistry
• OSTI ID: 5410376
• Report Number(s): AD-A-187056/7/XAB
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430303* -- Particle Accelerators-- Experimental Facilities &amp; Equipment
ACCELERATOR FACILITIES
ACCELERATORS
BREMSSTRAHLUNG
COLLIMATORS
CYCLIC ACCELERATORS
DIFFRACTOMETERS
DIMENSIONS
ELECTROMAGNETIC RADIATION
LENGTH
LIGHT SOURCES
MEASURING INSTRUMENTS
NSLS
RADIATION SOURCES
RADIATIONS
SCATTERING
SYNCHROTRON RADIATION
SYNCHROTRON RADIATION SOURCES
SYNCHROTRONS