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# Ian Robinson <i.robinson@ucl.ac.uk>
# requesting 6 days, at minimum=4 days
# beamline 34ID-C, X-ray ptychography of domain wall structures
# instrument 34ID-C coherent
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# top:/home/www/beamtime-requests/req01093.txt
# UNICAT Member Beam Time Request  #1093
# created Thu Dec 14 05:01:05 CST 2006
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apsrun:
	2007-01

beamline:
	34ID-C

collaboration:
	Yes

contact:
	i.robinson@ucl.ac.uk

days:
	6

description:
	Cu_3Au domain structures were the first thing ever studied with CXD, but to date soone has got an inverted image of the domain walls in such a sample.

Internal symmetry may be the reason for the problem.  This can be overcome by measuring diffraction from OVERLAPPING regions of the sample and using the redundancy as a constraint on the phasing.  THis method, called X-ray ptychography is particularly well suited to  domain wall structure.

The method is also well suited to Quantum Dot strctures.  We have a sample of GaInAs QD's which will be a backup if the Cu_3Au fails for any reason.

equipment_required:
	KB mirrors

experiment:
	X-ray ptychography of domain wall structures

foreign_nationals:
	

hazards:
	All samples will be prepared outside ANL and removed afterwards.

instrument:
	34ID-C coherent

instrument_other:
	

minimumdays:
	4

name:
	Ian Robinson

new_request:
	ON

nonmembers:
	

submit:
	Submit

unacceptable_dates:
	before March 20 and after April 18

z34ID_details:
	Need to stay below Cu edge and possibly tune through it to gain contrast.
Ga edge also interesting for backup sample

z34ID_parasitic:
	no


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