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McStas: Guide_honeycomb

[ Identification | Description | Input parameters | Links ]

The Guide_honeycomb Component

Neutron guide with gravity and honeycomb geometry. Can be channeled and focusing.


  • Site:
  • Author: G. Venturi
  • Origin: ILL (France).
  • Date: Apr 2003


Models a honeycomb guide tube centered on the Z axis. The entrance lies
in the X-Y plane. Gravitation applies also when reaching the guide input
window. The guide can be channeled (hexagonal channel section; nslit,d parameters).
The guide coating specifications may be entered via different ways (global,
or for each wall m-value).
For details on the geometry calculation see the description in the McStas
reference manual.

Example: Guide_honeycomb(w1=0.1, w2=0.1, l=12,
R0=0.99, Qc=0.0219, alpha=6.07, m=1.0, W=0.003, nslit=1, d=0.0005)

Input parameters

Parameters in boldface are required; the others are optional.
w1mWidth at the guide entry
w2mWidth at the guide exit. If zero, sets w2=w1.0
lmlength of guide
R01Low-angle reflectivity0.995
QcAA-1Critical scattering vector0.0218
alphaAASlope of reflectivity4.38
m1m-value of material. Zero means completely absorbing.1.0
WAA-1Width of supermirror cut-off0.003
nslit1Number of horizontal channels in the guide (>= 1) [1]1
dmThickness of subdividing walls [0]0.0005
mleftup1m-value of material for leftup. oblique mirror-1
mrightup1m-value of material for rightdown. oblique mirror-1
mleftdown1m-value of material for rightdown. oblique mirror-1
mrightdown1m-value of material for leftup. oblique mirror-1
mleft1m-value of material for left. vertical mirror-1
mright1m-value of material for right. vertical mirror-1
Gm/s2Gravitation norm. 0 value disables G effects.0


[ Identification | Description | Input parameters | Links ]

Generated on 2023-09-19 20:01:36

Last Modified: Tuesday, 16-Apr-2024 20:05:20 CEST
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