[ Identification | Description | Input parameters | Output parameters | Links ]
Guide_gravity
ComponentModels a rectangular 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 (k,d 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. The guide section may be splitted into nelements equivalent parts of length l/nelements. Chamfers do apply in between these parts. 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) 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) [1] (k-1 vertical dividing walls) | 1 |
d | m | Thicxkness of subdividing walls [0] | 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 (kh-1 horizontal dividing walls) this enables to have k*kh rectangular channels | -1 |
kh | 1 | ||
G | -9.81 | ||
wavy | 0 | ||
wavy_z | 0 | ||
wavy_tb | 0 | ||
wavy_lr | 0 | ||
chamfers | 0 | ||
chamfers_z | 0 | ||
chamfers_lr | 0 | ||
chamfers_tb | 0 | ||
nelements | 1 |
Name | Unit | Description | Default |
---|---|---|---|
GVars | 1 | internal variables 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> / Feb 28 2006