####################################################
# Ulmer <m-ulmer2@northwestern.edu>
# requesting 3 days, at minimum=2 days
# beamline 33BM, "Evaluation of Wolter I optics"
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# top:/home/www/beamtime-requests/req00446.txt
# UNICAT Member Beam Time Request  #446
# created Fri Aug 22 08:11:14 CDT 2003
####################################################

beamline:
	33BM

collaboration:
	Yes

collaborator_Paul:
	ON

contact:
	m-ulmer2@northwestern.edu

days:
	3

description:
	We are developing technologies to improve image figure quality for X-ray optics
while at the same time keeping the cost of the manufacture process down and the
wall or the mirrors thin. We would like to do a proof of concept experiment at 
the APS on the UNI-CAT 33BM-C beam-line.  We will use this proof of concept to
demonstrate we have the capability of characterizing mirrors at the APS which
we will use a leverage to win a NASA grant to develop the optics. As "spin-off"
for the APS, we may be able to demonstrate that it will be feasible to use this
approach for the next generation beam line X-ray optics. Our proposed
experiment for the next cycle would be to use and X-ray mirror  that we have
and with the cut-crystal beam expander available on the 33-BM-C beam line. We
will use the expanded beam to fill as much as the mirror aperture as possible. 
From discussion with Paul Zschack, we know  that at the 33 BM-C station has a
2.3 mrad divergence beam. The width of the beam is about the diameter of our
mirror = 12 cm and the height of the beam is about 4 cm. Our X-ray mirror is 12
cm in diameter and 40 cm long of the Wolter I class. It has a 2.018 meter focal
length. With this divergence we calculated a focal length of 2.1 m and a point
spread function if the figure is ideal of 3.76 arc sec (18.3 micro-rad). This
places a requirement of about 9 microns on the pixel size to be able to
distinguish features at the 4.86E-6 rad (1 arc second) level.  Collaborator
Yong Chu of SRI-CAT will provide his CCD camera with 9 micron pixels which is
just right for this experiment. We have two mirrors we are considering using.
Both are solid nickel, but one has an inside coating of 50nm thick of gold. 
The support fixture we will use in solid Al with stainless steel screws.
Therefore there are no materials related safety issues.  The optimal energy
range for us to work in in 5-7 keV, but there is some effective area up to 10
keV. This is especially true for the gold coated mirror. We request 1 day to
align, focus, and set up, and one day to take data.

equipment_required:
	Huber plus table for CCD camera from Yong Chu

experiment:
	Evaluation of Wolter I optics

foreign_nationals:
	

hazards:
	

minimumdays:
	2

name:
	Ulmer

nonmembers:
	Yong Chu (XRO CAT)

unacceptable_dates:
	week days Sep through Dec 10

z34ID_details:
	


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