####################################################
# Ruqing Xu <ruqingxu@uiuc.edu>
# requesting 6 days, at minimum=6 days
# beamline 33BM, TDS temperature dependence study
# instrument 33BM-C fourc
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# top:/home/www/beamtime-requests/req01042.txt
# UNICAT Member Beam Time Request  #1042
# created Fri Aug 25 17:51:28 CDT 2006
####################################################

apsrun:
	2006-03

beamline:
	33BM

collaboration:
	Yes

contact:
	ruqingxu@uiuc.edu

days:
	6

description:
	We are continuing our study of TDS temperature dependence with line scans. 

In the July 2006 run, the data for T-branch scans have yielded good quantitative result of phonon frequencies, which proves that our approach is plausible; however, we still need to improve our signal-noise ratio for the L-branch phonons, as well as longer time to study more k-points in the reciprocal space to make a complete story. We will also revise the sample holder to ensure a clean signal.

Basic description: X-ray incident on a single crystal sample of Cu(or Nb),  which will be mounted in a displex with a heater to control its temperature. TDS intensity will be measured with a point detector at different k-points and different temperatures.

We are considering the choice between 33BM-C and 33ID-D; the latter has the advantage of a brighter beam and thus faster data-collection rate. But if the goneometer in ID-D is not ok for this task, then a relatively longer beamtime in BM is needed.

equipment_required:
	displex, vaccuum pump, temprature controller

experiment:
	TDS temperature dependence study

foreign_nationals:
	Ruqing Xu, Hawoong Hong, Jaseung Ku

hazards:
	Cu sample might need to be processed with nitric acid, wich is corrosive & toxic.

instrument:
	33BM-C fourc

instrument_other:
	

minimumdays:
	6

name:
	Ruqing Xu

nonmembers:
	Hawoong Hong, Jaseung Ku

submit:
	Submit

unacceptable_dates:
	

z34ID_details:
	


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