[neutron-mc] Monochromator_curved parameter

[wokaoyan1981 at 126.com]

Hi all,

XOP 2.11 isn't available on Windows XP Home or Professional . 
Xop2.1beta Edition 
http://ftp.esrf.eu/pub/scisoft/xop2.1/Windows/setup_xop2.1b3.exe
is recommended instead.

Deeply grateful for Peter and Lucia's support.

Sincerely,
Tom




在2008-04-21，"Peter Willendrup" <peter.willendrup at risoe.dk> 写道：
Hi everyone,




Forwarding the following information from Lucia Alianelli (Diamond, UK).


Regards,


Peter




-------------------------- From Luica: -------------------------------------


Hi Tom,

You can use the NOP package, an extension to XOP.
NOP contains a neutron cross-section database, and tools to calculate
and plot reflectivity from crystals, mirrors etc.

Regards,
Lucia






XOP2.1 webpage:
http://www.esrf.eu/computing/scientific/xop2.1/intro.html

Ftp:
http://ftp.esrf.eu/pub/scisoft/xop2.1/

http://ftp.esrf.eu/pub/scisoft/xop2.1/Windows/Extensions/ 




On Apr 20, 2008, at 5:33 PM, Peter Willendrup wrote:
Hello Tom,


On Apr 16, 2008, at 3:57 PM, wokaoyan1981 wrote:
I'm visualizing the double bent crystal monochromator and here is my  
problem:

What is the suggested value of r0(Maximum Reflectivity) and  
t0(Transmission Efficiency) for each crystal plane of Si?(The  
default is 0.7 and 1.0 respectively.) Or where should I manage to  
obtain the reflectivity and transmision files for each Si(hkl)?

I would suggest you to start out by for example some of these references

Sears et al Acta Cryst. (1997). A53, 35-45 Bragg Reflection in Mosaic  
Crystals. I. General Solution of the Darwin Equations
Sears et al Acta Cryst. (1997). A53, 46-54 Bragg Reflection in Mosaic  
Crystals. H. Neutron Monochromator Properties

Kimura et al NIMA 482 (2002) 799–805 Development of a horizontally and  
vertically focused neutron
monochromator using stacked elastically bent Si single crystals

Or perhaps one of the other McStas users has one or more relevant  
reflectivity profiles to contribute?


Regards,

Peter Willendrup



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