ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
A block slit collimation system of the Kratky design concept has been 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[=(4π/λ)sin(θ/2) with λ and θ being the x-ray wavelength and the scattering angle, respectively] and ease of alignment, but also provides portability and low construction cost. With our SAXD operating at the SUNY X21A beamline of the National Synchrotron Light Source, we were able to reach θ∼1 mrad corresponding to q∼0.04 nm−1 (or a Bragg spacing of 150 nm) using an incident slit width (d) of 0.5 mm and λ=0.15 nm. At d=0.5 mm, ∼10% of the monochromatic synchrotron x-ray radiation passed through the block collimation system and a parasitic intensity to main beam intensity ratio of ∼10−5 at θ=1 mrad was achieved. With d∼0.1 mm, it is anticipated that q ∼0.01 nm−1 can be accessible. By changing the vacuum tube length between the sample chamber and the beam stop from ∼1400 to ∼200 mm, we could reach an intermediate q range of ∼0.04(approximately-less-than)q(approximately-less-than)10 nm−1 using a 5-cm-long linear position-sensitive detector with a resolution of ∼100 μm/channel. A description of the SAXD and its operation is presented.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1139591
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