Transcript Dan Peterson 2011-01-06 A program was developed to calculate the

Dan Peterson 2011-01-06
Comments on
changing the C-line low-energy optics
to the Canada chip.
A program was developed to calculate the
image from the coded apertures and single
slits.
Shown is an image (with 25 μm bin size) for
the Canada coded aperture
(10μm minimum feature, 310μm total height).
( x-ray energy = 1.8keV,
RMS beam size =15 μm )
This compares well with the image from
run 5183 (which is, of course, 50μm bin size).
With many separated features in the image,
the beam size resolution should be useful.
Dan Peterson 2011-01-06
Comparing the two low-energy coded apertures…
The Canada optic (10μm minimum feature size)
(top figure, and same as previous slide) provides
superior peak separation when compared to
the Japan optic (5μm minimum feature size)
(middle figure).
With the Japan optic, with
1.8 keV photon energy, 15 μm beam size,
the central peaks are merged;
the beam size resolution will be degraded.
This is consistent with measurements in C-line.
The high energy Japan optic in the C-line
also has 5μm minimum feature size.
However, with
4.0 keV photon energy, 15 μm beam size,
the peaks are better separated and will provide
useful measurements.