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# Mel Ulmer Badge #85333 <m-ulmer2@northwestern.edu>
# requesting 2 days, at minimum=2 days
# beamline 33BM, "Charaterizing a Wolter I Mirror"
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# top:/home/www/beamtime-requests/req00370.txt
# UNICAT Member Beam Time Request  #370
# created Thu Mar 06 15:10:09 CST 2003
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beamline:
	33BM

collaboration:
	Yes

collaborator+Paul:
	on

contact:
	m-ulmer2@northwestern.edu

days:
	2

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:
	cross cut crystal, BM -C line, Huber stage

experiment:
	Charaterizing a Wolter I Mirror

foreign+nationals:
	

hazards:
	

minimumdays:
	2

name:
	Mel Ulmer Badge #85333

nonmembers:
	Yong Chu (SRI-CAT)

unacceptable+dates:
	Aug 3-8, June 23-26


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