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/*******************************************************************************
*
* McStas, neutron ray-tracing package
* Copyright (C) 1997-2008, All rights reserved
* Risoe National Laboratory, Roskilde, Denmark
* Institut Laue Langevin, Grenoble, France
*
* Instrument: ISIS_Prisma2
*
* %Identification
* Written by: Kristian Nielsen and Mark Hagen
* Date: August 1998.
* Origin: ISIS/Risoe
* %INSTRUMENT_SITE: ISIS
*
* Simple simulation of PRISMA2 with RITA-style analyser backend.
*
* %Description
* Demonstrates how the standard components from the component library
* may be easily modified for special purposes; in this case to have
* the individual analyser blades paint a "color" on the neutrons to
* differentiate them in the detector.
*
* Output is in the file "prisma2.tof". The format is ASCII; each
* line consists of the time-of-flight in microseconds followed by seven
* intensities of neutrons from each individual analyser blade.
*
* %Example: TT=-30 Detector: mon9_I=7.4973e-08
*
* %Parameters
* TT: [deg] Take-off angle at the sample position, aka A4
* PHA: [deg] Analyzer group rotation angle, aka A5
* PHA1: [deg] Analyzer 1 tilt angle
* PHA2: [deg] Analyzer 2 tilt angle
* PHA3: [deg] Analyzer 3 tilt angle
* PHA4: [deg] Analyzer 4 tilt angle
* PHA5: [deg] Analyzer 5 tilt angle
* PHA6: [deg] Analyzer 6 tilt angle
* PHA7: [deg] Analyzer 7 tilt angle
* TTA: [deg] Take-off angle at the analyzer position, aka A6
*
* %Link
* The McStas User manual
* <a href="http://www.isis.rl.ac.uk/excitations/prisma/">PRISMA</a>
*
* %End
*******************************************************************************/
DEFINE INSTRUMENT ISIS_Prisma2(TT=-30,PHA=22,PHA1=-3,PHA2=-2,PHA3=-1, PHA4=0,PHA5=1,PHA6=2,PHA7=3,TTA=4)
DECLARE
%{
/* 30' mosaicity used on analysator */
double prisma_ana_mosaic = 30;
/* Q vector for bragg scattering with monochromator and analysator */
double prisma_ana_q = 1.87325;
double prisma_ana_r0 = 0.6;
double focus_x,focus_z;
double apos1, apos2, apos3, apos4, apos5, apos6, apos7;
%}
USERVARS %{
int neu_color;
%}
INITIALIZE
%{
focus_x = 0.52 * sin(TT*DEG2RAD);
focus_z = 0.52 * cos(TT*DEG2RAD);
/* Rita-style analyser. */
{
double l = 0.0125;
apos1 = -3*l;
apos2 = -2*l;
apos3 = -1*l;
apos4 = 0*l;
apos5 = 1*l;
apos6 = 2*l;
apos7 = 3*l;
}
%}
TRACE
COMPONENT mod = Moderator(
radius = 0.0707,
dist = 9.035,
focus_xw = 0.021,
focus_yh = 0.021,
Emin = 10, Emax = 15,
Ec = 9.0, t0 = 37.15, gamma = 39.1)
AT (0,0,0) ABSOLUTE
/* Use a slit to get the effect of a rectangular source. */
COMPONENT modslit = Slit(xmin = -0.05, xmax = 0.05,
ymin = -0.05, ymax = 0.05)
AT(0,0,0.000001) RELATIVE mod
COMPONENT tof_test = TOF_monitor(xmin = -0.05, xmax = 0.05,
ymin = -0.05, ymax = 0.05,
nt = 500, dt = 1,
filename = "prisma2.mon")
AT (0,0,0.005) RELATIVE mod
COMPONENT mon1 = Monitor(xmin = -0.1, xmax = 0.1, ymin = -0.1, ymax = 0.1)
AT(0,0,0.01) RELATIVE mod ROTATED (0,0,0) RELATIVE mod
COMPONENT slit1 = Slit(xmin = -0.05, xmax = 0.05,
ymin = -0.05, ymax = 0.05)
AT(0,0,1.7) RELATIVE mod
COMPONENT slit2 = Slit(xmin = -0.02, xmax = 0.02,
ymin = -0.03, ymax = 0.03)
AT(0,0,7) RELATIVE slit1
COMPONENT mon2 = Monitor(xmin = -0.1, xmax = 0.1, ymin = -0.1, ymax = 0.1)
AT(0,0,9) RELATIVE mod
COMPONENT sample = Incoherent(
radius = 0.01,
thickness = 0.00999,
yheight = 0.02,
focus_r = 0.03,
pack = 1,
target_x = focus_x, target_y = 0, target_z = focus_z)
AT (0, 0, 9.035) RELATIVE mod
COMPONENT a2 = Arm() AT (0,0,0) RELATIVE sample ROTATED (0,TT,0) RELATIVE sample
COMPONENT mon3 = Monitor(xmin = -0.1, xmax = 0.1, ymin = -0.1, ymax = 0.1)
AT(0,0,0.39) RELATIVE a2
COMPONENT coll2 = Collimator_linear(xmin = -0.015, xmax = 0.015,
ymin = -0.025, ymax = 0.025,
length = 0.12, divergence = 120)
AT(0,0,0.40) RELATIVE a2
COMPONENT mon4 = Monitor(xmin = -0.1, xmax = 0.1, ymin = -0.1, ymax = 0.1)
AT(0,0,0.521) RELATIVE a2
COMPONENT rita_ana = Arm()
AT(0, 0, 0.58) relative a2 ROTATED (0, PHA, 0) RELATIVE a2
COMPONENT ana1 = Monochromator_flat(
ymin=-0.0375,ymax=0.0375,zmin=-0.006,zmax=0.006,
mosaich=prisma_ana_mosaic,mosaicv=prisma_ana_mosaic,
r0=prisma_ana_r0, Q=prisma_ana_q)
AT (0, 0, apos1) RELATIVE rita_ana
ROTATED (0, PHA1, 0) RELATIVE rita_ana
EXTEND %{
if(SCATTERED) neu_color=1;
%}
COMPONENT ana2 = Monochromator_flat(
ymin=-0.0375,ymax=0.0375,zmin=-0.006,zmax=0.006,
mosaich=prisma_ana_mosaic,mosaicv=prisma_ana_mosaic,
r0=prisma_ana_r0, Q=prisma_ana_q)
AT (0, 0, apos2) RELATIVE rita_ana
ROTATED (0, PHA2, 0) RELATIVE rita_ana
EXTEND %{
if(SCATTERED) neu_color=2;
%}
COMPONENT ana3 = Monochromator_flat(
ymin=-0.0375,ymax=0.0375,zmin=-0.006,zmax=0.006,
mosaich=prisma_ana_mosaic,mosaicv=prisma_ana_mosaic,
r0=prisma_ana_r0, Q=prisma_ana_q)
AT (0, 0, apos3) RELATIVE rita_ana
ROTATED (0, PHA3, 0) RELATIVE rita_ana
EXTEND %{
if(SCATTERED) neu_color=3;
%}
COMPONENT ana4 = Monochromator_flat(
ymin=-0.0375,ymax=0.0375,zmin=-0.006,zmax=0.006,
mosaich=prisma_ana_mosaic,mosaicv=prisma_ana_mosaic,
r0=prisma_ana_r0, Q=prisma_ana_q)
AT (0, 0, apos4) RELATIVE rita_ana
ROTATED (0, PHA4, 0) RELATIVE rita_ana
EXTEND %{
if(SCATTERED) neu_color=4;
%}
COMPONENT ana5 = Monochromator_flat(
ymin=-0.0375,ymax=0.0375,zmin=-0.006,zmax=0.006,
mosaich=prisma_ana_mosaic,mosaicv=prisma_ana_mosaic,
r0=prisma_ana_r0, Q=prisma_ana_q)
AT (0, 0, apos5) RELATIVE rita_ana
ROTATED (0, PHA5, 0) RELATIVE rita_ana
EXTEND %{
if(SCATTERED) neu_color=5;
%}
COMPONENT ana6 = Monochromator_flat(
ymin=-0.0375,ymax=0.0375,zmin=-0.006,zmax=0.006,
mosaich=prisma_ana_mosaic,mosaicv=prisma_ana_mosaic,
r0=prisma_ana_r0, Q=prisma_ana_q)
AT (0, 0, apos6) RELATIVE rita_ana
ROTATED (0, PHA6, 0) RELATIVE rita_ana
EXTEND %{
if(SCATTERED) neu_color=6;
%}
COMPONENT ana7 = Monochromator_flat(
ymin=-0.0375,ymax=0.0375,zmin=-0.006,zmax=0.006,
mosaich=prisma_ana_mosaic,mosaicv=prisma_ana_mosaic,
r0=prisma_ana_r0, Q=prisma_ana_q)
AT (0, 0, apos7) RELATIVE rita_ana
ROTATED (0, PHA7, 0) RELATIVE rita_ana
EXTEND %{
if(SCATTERED) neu_color=7;
%}
COMPONENT a3 = Arm()
AT (0,0,0) relative rita_ana ROTATED (0,TTA,0) RELATIVE a2
COMPONENT mon5 = Monitor(xmin = -0.05, xmax = 0.05, ymin = -0.05, ymax = 0.05)
AT(0,0,0.06) RELATIVE a3
COMPONENT mon6 = Monitor(xmin = -0.1, xmax = 0.1, ymin = -0.1, ymax = 0.1)
AT(0,0,0.161) RELATIVE a3
COMPONENT psd = PSD_monitor(xmin = -0.05, xmax = 0.05,
ymin = -0.05, ymax = 0.05,
nx = 100, ny = 100,
filename = "prisma2.psd")
AT(0,0,0.20) RELATIVE a3
COMPONENT Detector = Monitor_nD(xmin = -0.05, xmax = 0.05,
ymin = -0.05, ymax = 0.05,
options="t limits=[0 10000] bins=1000",
restore_neutron=1)
AT (0,0,0.20) RELATIVE a3
COMPONENT Detector1 = Monitor_nD(xmin = -0.05, xmax = 0.05,
ymin = -0.05, ymax = 0.05,
options="t limits=[0 10000] bins=1000",
restore_neutron=1)
WHEN (neu_color==1) AT (0,0,0.20) RELATIVE a3
COMPONENT Detector2 = Monitor_nD(xmin = -0.05, xmax = 0.05,
ymin = -0.05, ymax = 0.05,
options="t limits=[0 10000] bins=1000",
restore_neutron=1)
WHEN (neu_color==2) AT (0,0,0.20) RELATIVE a3
COMPONENT Detector3 = Monitor_nD(xmin = -0.05, xmax = 0.05,
ymin = -0.05, ymax = 0.05,
options="t limits=[0 10000] bins=1000",
restore_neutron=1)
WHEN (neu_color==3) AT (0,0,0.20) RELATIVE a3
COMPONENT Detector4 = Monitor_nD(xmin = -0.05, xmax = 0.05,
ymin = -0.05, ymax = 0.05,
options="t limits=[0 10000] bins=1000",
restore_neutron=1)
WHEN (neu_color==4) AT (0,0,0.20) RELATIVE a3
COMPONENT Detector5 = Monitor_nD(xmin = -0.05, xmax = 0.05,
ymin = -0.05, ymax = 0.05,
options="t limits=[0 10000] bins=1000",
restore_neutron=1)
WHEN (neu_color==5) AT (0,0,0.20) RELATIVE a3
COMPONENT Detector6 = Monitor_nD(xmin = -0.05, xmax = 0.05,
ymin = -0.05, ymax = 0.05,
options="t limits=[0 10000] bins=1000",
restore_neutron=1)
WHEN (neu_color==6) AT (0,0,0.20) RELATIVE a3
COMPONENT Detector7 = Monitor_nD(xmin = -0.05, xmax = 0.05,
ymin = -0.05, ymax = 0.05,
options="t limits=[0 10000] bins=1000",
restore_neutron=1)
WHEN (neu_color==7) AT (0,0,0.20) RELATIVE a3
COMPONENT mon9 = Monitor(xmin = -0.1, xmax = 0.1, ymin = -0.1, ymax = 0.1)
AT(0,0,0.01) RELATIVE Detector
END
|
