[neutron-mc] Monochromator_curved parameter

[Peter Willendrup]

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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