[ Identification | Description | Input parameters | Output parameters | Links ]
Guide_gravity
ComponentModels a rectangular straight guide tube centered on the Z axis, with gravitation handling. The entrance lies in the X-Y plane. The guide can be channeled (k,d,kh parameters). The guide coating specifications may be entered via different ways (global, or for each wall m-value). Waviness (random) may be specified either globally or for each mirror type. Side chamfers (due to substrate processing) may be specified the same way. In order to model a realistic straight guide assembly, a long guide of length 'l' may be splitted into 'nelements' between which chamfers/gaps are positioned. For details on the geometry calculation see the description in the McStas reference manual. Example: Guide_gravity(w1=0.1, h1=0.1, w2=0.1, h2=0.1, l=12, R0=0.99, Qc=0.0219, alpha=6.07, m=1.0, W=0.003, k=1, d=0.0005) %VALIDATION May 2005: extensive internal test, all problems solved Validated by: K. Lieutenant Example values: m=4 Qc=0.02 W=1/300 alpha=6.49 R0=1
Name | Unit | Description | Default |
---|---|---|---|
w1 | m | Width at the guide entry | |
h1 | m | Height at the guide entry | |
w2 | m | Width at the guide exit | |
h2 | m | Height at the guide exit | |
l | m | length of guide | |
R0 | 1 | Low-angle reflectivity | 0.99 |
Qc | AA-1 | Critical scattering vector | 0.0219 |
alpha | AA | Slope of reflectivity | 6.07 |
m | 1 | m-value of material. Zero means completely absorbing. | 1.0 |
W | AA-1 | Width of supermirror cut-off | 0.003 |
k | 1 | Number of vertical channels in the guide (>= 1) (k-1 vertical dividing walls). | 1 |
d | m | Thicxkness of subdividing walls | 0.0005 |
mleft | 1 | m-value of material for left. vert. mirror | -1 |
mright | 1 | m-value of material for right. vert. mirror | -1 |
mtop | 1 | m-value of material for top. horz. mirror | -1 |
mbottom | 1 | m-value of material for bottom. horz. mirror | -1 |
kh | 1 | Number of horizontal channels in the guide (>= 1). (kh-1 horizontal dividing walls). this enables to have k*kh rectangular channels | 1 |
G | m/s2 | Gravitation norm. 0 value disables G effects. | 0 |
wavy | deg | Global guide waviness | 0 |
wavy_z | deg | Partial waviness along propagation axis | 0 |
wavy_tb | deg | Partial waviness in transverse direction for top/bottom mirrors | 0 |
wavy_lr | deg | Partial waviness in transverse direction for left/right mirrors | 0 |
chamfers | m | Global chamfers specifications (in/out/mirror sides). | 0 |
chamfers_z | m | Input and output chamfers | 0 |
chamfers_lr | m | Chamfers on left/right mirror sides | 0 |
chamfers_tb | m | Chamfers on top/bottom mirror sides | 0 |
nelements | 1 | Number of sections in the guide (length l/nelements). | 1 |
Name | Unit | Description | Default |
---|---|---|---|
GVars | - | .N_reflection: (1) Array of the cumulated Number of reflections. N_reflection[0] total nb of reflections, N_reflection[1,2,3,4] l/r/t/b reflections, N_reflection[5] total nb neutrons exiting guide, N_reflection[6] total nb neutrons entering guide. |
Guide_gravity.comp
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[ Identification | Description | Input parameters | Output parameters | Links ]
Generated automatically by McDoc, Peter Willendrup <peter.willendrup@risoe.dk> / Fri Oct 20 17:03:45 2006