About McStas Download Documentation 
[ Identification  Description  Input parameters  Links ] The
Port of the Single_crystal component to the Union components

Name  Unit  Description  Default  
reflections  string  File name containing structure factors of reflections. Use empty ("") or NULL for incoherent scattering only  0  
delta_d_d  1  Lattice spacing variance, gaussian RMS  1e4  
mosaic  arc minutes  Crystal mosaic (isotropic), gaussian RMS. Puts the crystal in the isotropic mosaic model state, thus disregarding other mosaicity parameters.  1  
mosaic_a  arc minutes  Horizontal (rotation around lattice vector a) mosaic (anisotropic), gaussian RMS. Put the crystal in the anisotropic crystal vector state. I.e. model mosaicity through rotation around the crystal lattice vectors. Has precedence over inplane mosaic model.  1  
mosaic_b  arc minutes  Vertical (rotation around lattice vector b) mosaic (anisotropic), gaussian RMS.  1  
mosaic_c  arc minutes  Outofplane (Rotation around lattice vector c) mosaic (anisotropic), gaussian RMS  1  
mosaic_AB  arc_minutes, arc_minutes,1, 1, 1, 1, 1, 1  In Plane mosaic rotation and plane vectors (anisotropic), mosaic_A, mosaic_B, A_h,A_k,A_l, B_h,B_k,B_l. Puts the crystal in the inplane mosaic state. Vectors A and B define plane in which the crystal roation is defined, and mosaic_A, mosaic_B, denotes the resp. mosaicities (gaussian RMS) with respect to the two reflections chosen by A and B (Miller indices).  {0,0, 0,0,0, 0,0,0}  
recip_cell  1  Choice of direct/reciprocal (0/1) unit cell definition  0  
barns  1  Flag to indicate if F^2 from 'reflections' is in barns or fm^2. barns=1 for laz and isotropic constant elastic scattering (reflections=NULL), barns=0 for lau type files  0  
ax  AA or AA^1  Coordinates of first (direct/recip) unit cell vector  0  
ay  AA or AA^1  a on y axis  0  
az  AA or AA^1  a on z axis  0  
bx  AA or AA^1  Coordinates of second (direct/recip) unit cell vector  0  
by  AA or AA^1  b on y axis  0  
bz  AA or AA^1  b on z axis  0  
cx  AA or AA^1  Coordinates of third (direct/recip) unit cell vector  0  
cy  AA or AA^1  c on y axis  0  
cz  AA or AA^1  c on z axis  0  
aa  deg  Unit cell angles alpha, beta and gamma. Then uses norms of vectors a,b and c as lattice parameters  0  
bb  deg  Beta angle  0  
cc  deg  Gamma angle  0  
order  1  Limit multiple scattering up to given order (0: all, 1: first, 2: second, ...)  0  
RX  m  Radius of lattice curvature along X. flat when 0.  0  
RY  m  Radius of lattice curvature along Y. flat when 0.  0  
RZ  m  Radius of lattice curvature along Z. flat when 0.  0  
powder  1  Flag to indicate powder mode, for simulation of DebyeScherrer cones via random crystallite orientation. A powder texture can be approximated with 0  0  
PG  1  Flag to indicate "Pyrolytic Graphite" mode, only meaningful with choice of Graphite.lau, models PG crystal. A powder texture can be approximated with 0  0  
interact_fraction  1  How large a part of the scattering events should use this process 01 (sum of all processes in material = 1)  1  
packing_factor  1  How dense is the material compared to optimal 01  1 
AT (  ,  ,  ) RELATIVE  

ROTATED (  ,  ,  ) RELATIVE 
Single_crystal_process.comp
.
[ Identification  Description  Input parameters  Links ]
Generated on 20230919 20:01:36