Preliminary comparison of monolithic and aperture optics for XRMF Page: 4 of 8
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Havrilla & Worley
Preliminary Comparison ofMonolithic and Aperture Optics for XRMF
The capillary was placed within the Omicron at a fixed z-distance from the x-ray tube. No
effort was made to change this distance since the primary goal of this work was to determine flux
25.4 mm 29 mm 6 mm
Figure 1. Schematic of monolithic polycapillary optic with appropriate
dimensions. Expected focal spot is about 23 microns.
increase. The adjustment of the capillary to x-ray tube distance mainly affects the focal spot size.
A crude measurement of the spot size was accomplished using an iron wire 250 microns wide.
The plot in Figure 2 shows the movement of the beam over the iron wire in 28 micron steps as the
intensity of the iron Ka line was monitored. The beam spot size measured at FWHM is about 300
microns. This is about an order of magnitude greater than the expected spot size of 23 microns.
Clearly the capillary-to-x-ray tube distance needs to be optimized. However this does demonstrate
the potential for a continuously changing spot size with proper mechanical engineering within the
instrument and control of the capillary-tube distance.
The primary objective of using the capillary optic is to increase the x-ray flux at the sample
Figure 2. Linewidth scan of capillary spot over a 250 micron diameter iron
wire. Measured FWHM of beam diameter is about 300 microns.
Advances in X-ray Analysis
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Havrilla, G.J. & Worley, C.G. Preliminary comparison of monolithic and aperture optics for XRMF, article, August 1, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc685505/m1/4/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.