The Multilayer_Sample McStas Component

Multilayer Reﬂecting sample using matrix Formula, v2 with ’nrepeats’ for repeating multilayer structure.

in order to get this to compile you need to link against the gsl and gslcblas libraries.

to do this automatically edit /usr/local/lib/mcstas/tools/perl/mcstas_conﬁg.perl

add -lgsl and -lgslcblas to the CFLAGS line

Horizontal reﬂecting substrate deﬁned by SLDs,Thicknesses, roughnesses The superphase may also be determined

Example: Multilayer_Sample(xmin=-0.1, xmax=0.1,zmin=-0.1, zmax=0.1, nlayer=1,sldPar={0.0,2.0e-6,0.0e-6},dPar={20.0}, sigmaPar={5.0,5.0})

Example: d1 500: sld1 (air) 0.0: sld2 (Si) 2.07e-6: sldf1(ﬁlm Ni) 9.1e-6

Parameters in boldface are required; the others are optional.


Name	Unit	Description	Default



xwidth	m	Width of substrate	0.2
zlength	m	Length of substrate	0.2
nlayer	1	Number of ﬁlm layers	1
nrepeats	1	Number of repeats of the block of layers appart from the superphase and substrate	1
sldPar	Å\(^{-2}\)	Scattering length Density’s of layers	{0.0,2.0e-6,0.0e-6}
dPar	Å	Thicknesses of ﬁlm layers	{20.0}
sigmaPar	Å	r.m.s roughnesses of the interfaces	{5.0,5.0}
frac_inc	1	Fraction of statistics to assign to incoherent scattering	0
ythick	m	Thickness of substrate	0
mu_inc	m\(^{-1}\)	Incoherent scattering length	5.62
target_index	1	Used in combination with focus_xw and focus_yh to indicate solid angle for incoherent scattering.	0
focus_xw	m	Used in combination with target_index and focus_yh to indicate solid angle for incoherent scattering.	0