/*******************************************************************************
*
* McStas, neutron ray-tracing package
*         Copyright (C) 1997-2008, All rights reserved
*         Risoe National Laboratory, Roskilde, Denmark
*         Institut Laue Langevin, Grenoble, France
*
* Instrument: TAS1_Diff_Slit
*
* %Identification
* Written by: A. Abrahamsen, N. B. Christensen, and E. Lauridsen
* Date: 1998
* Origin: Risoe
* %INSTRUMENT_SITE: Risoe
*
* The conventional cold-source triple-axis spectrometer TAS1 at Risoe National
* Laboratory used as a diffractometer for a collimation alignment study with a
* slit sample.
*
* %Description
* This instrument is the conventional cold-source triple-axis spectrometer TAS1
* at Risoe National Laboratory. It does not exist anymore, but was used as the
* first detailed work performed with the McStas package.
* Here it is used as a diffractometer for a collimation alignment study. The
* sample is a slit and there is no analyzer.
*
* %Example:  C1=30 TT=0 Detector: sng_I=2e-5
*
* %Parameters
* PHM: [deg]   Monochromator arm angle, aka A1
* TTM: [deg]   Monochromator take-off angle, aka A2
* TT: [deg]    Take-off angle at the sample position, aka A4
* C1: [min]    Collimator 1 aperture (mono-sample arm)
* OMC1: [deg]  Tilt angle of the Collimator 1
* C2: [min]    Collimator 2 aperture (sample-ana arm)
* C3: [min]    Collimator 3 aperture (ana-detector arm)
*
* %Link
* The McStas User manual
* A. Abrahamsen, N. B. Christensen, and E. Lauridsen. McStas simulations of the TAS1 spectrometer. Student's report, Niels Bohr Institute, University of Copenhagen, 1998.
*
* %End
*******************************************************************************/
DEFINE INSTRUMENT TAS1_Diff_Slit(PHM=-37.077, TTM=-74, TT=33.52, C1=30, OMC1=5.5, C2=28, C3=67)

DECLARE
%{
/* Mosaicity used on monochromator and analysator */
double tas1_mono_mosaic = 45; /* Measurements indicate its really 45' */
/* Q vector for bragg scattering with monochromator and analysator */
double tas1_mono_q = 2*1.87325; /* Fake 2nd order scattering for 20meV */
double tas1_mono_r0 = 0.6;

/* Collimators */
double OMC1_d;

double mpos0, mpos1, mpos2, mpos3, mpos4, mpos5, mpos6, mpos7;
double mrot0, mrot1, mrot2, mrot3, mrot4, mrot5, mrot6, mrot7;
%}

INITIALIZE
%{
  double d = 0.0125;    /* 12.5 mm between slab centers. */
  double phi = 0.5443;    /* Rotation between adjacent slabs. */
  mpos0 = -3.5*d; mrot0 = -3.5*phi;
  mpos1 = -2.5*d; mrot1 = -2.5*phi;
  mpos2 = -1.5*d; mrot2 = -1.5*phi;
  mpos3 = -0.5*d; mrot3 = -0.5*phi;
  mpos4 =  0.5*d; mrot4 =  0.5*phi;
  mpos5 =  1.5*d; mrot5 =  1.5*phi;
  mpos6 =  2.5*d; mrot6 =  2.5*phi;
  mpos7 =  3.5*d; mrot7 =  3.5*phi;

  OMC1_d = OMC1/60.0;
%}

TRACE

COMPONENT a1 = Arm()
  AT (0,0,0) ABSOLUTE

COMPONENT source = Source_simple(
  radius = 0.060,
  dist = 3.288,
  focus_xw = 0.042, focus_yh = 0.082,
  E0 = 20,     /* 20 meV */
  dE = 0.82    /* Sufficient for TAS1 geometry */
)
  AT (0,0,0) RELATIVE a1 ROTATED (0,0,0) RELATIVE a1

COMPONENT slit1 = Slit(
  xmin=-0.020, xmax=0.065,
  ymin = -0.075, ymax = 0.075)
  AT (0, 0, 1.1215) RELATIVE a1 ROTATED (0,0,0) RELATIVE a1

COMPONENT slit2 = Slit(
  xmin = -0.020, xmax = 0.020,
  ymin = -0.040, ymax = 0.040)
  AT (0,0,1.900) RELATIVE a1 ROTATED (0,0,0) RELATIVE a1

COMPONENT slit3 = Slit(
  xmin = -0.021, xmax = 0.021,
  ymin = -0.041, ymax = 0.041)
  AT (0,0,3.288) RELATIVE a1 ROTATED (0,0,0) RELATIVE a1

COMPONENT focus_mono = Arm()
  AT (0, 0, 3.56) RELATIVE a1 ROTATED (0, PHM, 0) RELATIVE a1

COMPONENT m0 = Monochromator_flat(
  zmin=-0.0375,zmax=0.0375,ymin=-0.006,ymax=0.006,
  mosaich=tas1_mono_mosaic,mosaicv=tas1_mono_mosaic,
  r0=tas1_mono_r0, Q=tas1_mono_q)
  AT (0, mpos0, 0) RELATIVE focus_mono
  ROTATED (0, 0, mrot0) RELATIVE focus_mono

COMPONENT m1 = Monochromator_flat(
  zmin=-0.0375,zmax=0.0375,ymin=-0.006,ymax=0.006,
  mosaich=tas1_mono_mosaic,mosaicv=tas1_mono_mosaic,
  r0=tas1_mono_r0, Q=tas1_mono_q)
  AT (0, mpos1, 0) RELATIVE focus_mono
  ROTATED (0, 0, mrot1) RELATIVE focus_mono

COMPONENT m2 = Monochromator_flat(
  zmin=-0.0375,zmax=0.0375,ymin=-0.006,ymax=0.006,
  mosaich=tas1_mono_mosaic,mosaicv=tas1_mono_mosaic,
  r0=tas1_mono_r0, Q=tas1_mono_q)
  AT (0, mpos2, 0) RELATIVE focus_mono
  ROTATED (0, 0, mrot2) RELATIVE focus_mono

COMPONENT m3 = Monochromator_flat(
  zmin=-0.0375,zmax=0.0375,ymin=-0.006,ymax=0.006,
  mosaich=tas1_mono_mosaic,mosaicv=tas1_mono_mosaic,
  r0=tas1_mono_r0, Q=tas1_mono_q)
  AT (0, mpos3, 0) RELATIVE focus_mono
  ROTATED (0, 0, mrot3) RELATIVE focus_mono

COMPONENT m4 = Monochromator_flat(
  zmin=-0.0375,zmax=0.0375,ymin=-0.006,ymax=0.006,
  mosaich=tas1_mono_mosaic,mosaicv=tas1_mono_mosaic,
  r0=tas1_mono_r0, Q=tas1_mono_q)
  AT (0, mpos4, 0) RELATIVE focus_mono
  ROTATED (0, 0, mrot4) RELATIVE focus_mono

COMPONENT m5 = Monochromator_flat(
  zmin=-0.0375,zmax=0.0375,ymin=-0.006,ymax=0.006,
  mosaich=tas1_mono_mosaic,mosaicv=tas1_mono_mosaic,
  r0=tas1_mono_r0, Q=tas1_mono_q)
  AT (0, mpos5, 0) RELATIVE focus_mono
  ROTATED (0, 0, mrot5) RELATIVE focus_mono

COMPONENT m6 = Monochromator_flat(
  zmin=-0.0375,zmax=0.0375,ymin=-0.006,ymax=0.006,
  mosaich=tas1_mono_mosaic,mosaicv=tas1_mono_mosaic,
  r0=tas1_mono_r0, Q=tas1_mono_q)
  AT (0, mpos6, 0) RELATIVE focus_mono
  ROTATED (0, 0, mrot6) RELATIVE focus_mono

COMPONENT m7 = Monochromator_flat(
  zmin=-0.0375,zmax=0.0375,ymin=-0.006,ymax=0.006,
  mosaich=tas1_mono_mosaic,mosaicv=tas1_mono_mosaic,
  r0=tas1_mono_r0, Q=tas1_mono_q)
  AT (0, mpos7, 0) RELATIVE focus_mono
  ROTATED (0, 0, mrot7) RELATIVE focus_mono

COMPONENT a2 = Arm()
  AT (0,0,0) RELATIVE focus_mono ROTATED (0, TTM, 0) RELATIVE a1

COMPONENT slitMS1 = Slit(
  xmin = -0.0105, xmax = 0.0105, ymin = -0.035, ymax = 0.035)
  AT (0,0,0.565) RELATIVE a2 ROTATED (0,0,0) RELATIVE a2

COMPONENT slitMS2 = Slit(
  xmin = -0.0105, xmax = 0.0105, ymin = -0.035, ymax = 0.035)
  AT (0,0,0.855) RELATIVE a2 ROTATED (0,0,0) RELATIVE a2

COMPONENT c1 = Collimator_linear(
  xmin = -0.02, xmax = 0.02, ymin = -0.0375, ymax = 0.0375,
  length = 0.250, divergence = C1)
  AT (0, 0, 0.87) RELATIVE a2 ROTATED (0,OMC1_d,0) RELATIVE a2

COMPONENT slitMS3 = Slit(radius = 0.025)
  AT (0,0,1.130) RELATIVE a2 ROTATED (0,0,0) RELATIVE a2

COMPONENT slitMS4 = Slit(radius = 0.025)
  AT (0,0,1.180) RELATIVE a2 ROTATED (0,0,0) RELATIVE a2

COMPONENT slitMS5 = Slit(radius = 0.0275)
  AT (0,0,1.230) RELATIVE a2 ROTATED (0,0,0) RELATIVE a2

COMPONENT mon = Monitor(
  xmin = -0.025, xmax = 0.025, ymin = -0.0375, ymax = 0.0375)
  AT (0, 0, 1.280) RELATIVE a2 ROTATED (0,0,0) RELATIVE a2

COMPONENT emon1 = E_monitor(
  xmin = -0.01, xmax = 0.01, ymin = -0.1, ymax = 0.1,
  Emin = 19.25, Emax = 20.75, nE = 35,
  filename = "linup_3_1.vmon")
  AT(0, 0, 1.5) RELATIVE a2 ROTATED (0,0,0) RELATIVE a2

COMPONENT sample = Slit(
  xmin = -0.00525, xmax = 0.00525, ymin = -0.02025, ymax = 0.02025)
  AT (0, 0, 1.565) RELATIVE a2 ROTATED (0,0,0) RELATIVE a2

COMPONENT slit1mm = Slit(
  xmin = -0.0005, xmax = 0.0005, ymin = -0.02, ymax = 0.02)
  AT (0, 0, 0.030) RELATIVE sample ROTATED (0,0,0) RELATIVE sample

COMPONENT a3 = Arm()
  AT (0,0,0) RELATIVE sample ROTATED (0, TT, 0) RELATIVE a2

COMPONENT c2 = Collimator_linear(
  xmin = -0.02, xmax = 0.02, ymin = -0.0315, ymax = 0.0315,
  length = 0.300, divergence = C2)
  AT (0, 0, 0.370) RELATIVE a3 ROTATED (0,0,0) RELATIVE a3

COMPONENT ana = Arm()
  AT (0, 0, 0.770) RELATIVE a3 ROTATED (0, 0, 0) RELATIVE a3

COMPONENT a4 = Arm()
  AT (0, 0, 0) RELATIVE ana ROTATED (0, 0, 0) RELATIVE a3

COMPONENT c3 = Collimator_linear(
  xmin = -0.02, xmax = 0.02, ymin = -0.05, ymax = 0.05,
  length = 0.270, divergence = C3)
  AT (0,0,0.104) RELATIVE a4 ROTATED (0,0,0) RELATIVE a4

COMPONENT sng = Monitor(
  xmin = -0.01, xmax = 0.01, ymin = -0.045, ymax = 0.045)
  AT(0, 0, 0.43) RELATIVE a4 ROTATED (0,0,0) RELATIVE a4

COMPONENT Emon2 = E_monitor(
  xmin = -0.0125, xmax = 0.0125, ymin = -0.05, ymax = 0.05,
  Emin = 19.25, Emax = 20.75, nE = 35,
  filename = "linup_3_2.vmon")
  AT(0, 0, 0.430001) RELATIVE a4 ROTATED (0,0,0) RELATIVE a4

END
