About McStas Download Documentation 
[ Identification  Description  Input parameters  Output parameters  Links ] The
Models a rectangular tapered guide (many shapes)

Name  Unit  Description  Default 

option  str  define the input function for the curve of the guide walls options are: "elliptical"  define elliptical function of guide walls "parabolical"  define parabolical function of guide walls "straight"  define a straight elements guide "file=[filename]"  read in ASCfile with arbitrary definition for the curve of the guide walls  0 
w1  m  Width at the guide entry  0 
h1  m  Height at the guide entry  0 
l  m  length of guide  
linw  m  distance from 1st focal point to real guide entry  left and right horizontal mirrors  0 
loutw  m  distance from real guide exit to 2nd focal point  left and right horizontal mirrors  0 
linh  m  distance from 1st focal point to real guide entry  top and bottom vertical mirrors  0 
louth  m  distance from real guide exit to 2nd focal point  top and bottom vertical mirrors  0 
R0  1  Lowangle reflectivity  0.99 
Qcx  AA1  Critical scattering vector for left and right vertical mirrors in each channel  0.021 
Qcy  AA1  Critical scattering vector for top and bottom mirrors  0.021 
alphax  AA  Slope of reflectivity for left and right vertical mirrors in each channel  6.07 
alphay  AA  Slope of reflectivity for top and bottom mirrors  6.07 
W  AA1  Width of supermirror cutoff for all mirrors  0.003 
mx  1  mvalue of material for left and right vertical mirrors in each channel. Zero means completely absorbing. Negative value will adapt coating as e.g. m=mx*w1/w  1 
my  1  mvalue of material for top and bottom mirrors. Zero means completely absorbing. Negative value will adapt coating as e.g. m=my*h1/h  1 
segno  1  number of segments (zaxis) for cutting the tube  800 
curvature  m  guide horizontal radius of curvature. Zero means straight.  0 
curvature_v  m  guide vertical radius of curvature. Zero means straight.  0 
Name  Unit  Description  Default 

w1c  
w2c  
ww  
hh  
whalf  
hhalf  
lwhalf  
lhhalf  
h1_in  
h2_out  
w1_in  
w2_out  
l_seg  
seg  
h12  
h2  
w12  
w2  
a_ell_q  
b_ell_q  
lbw  
lbh  
mxi  
u1  
u2  
div1  
p2_para  
test  
Div1  
i  
ii  
seg  
fu  
pos  
file_name  
ep  
num  
rotation_h  
rotation_v 
Guide_tapering.comp
.
[ Identification  Description  Input parameters  Output parameters  Links ]
Generated automatically by McDoc, Peter Willendrup <peter.willendrup@risoe.dk> / Fri Mar 17 20:40:06 2017