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/*******************************************************************************
*
* McStas, neutron ray-tracing package
* Copyright (C) 1997-2011, All rights reserved
* Risoe National Laboratory, Roskilde, Denmark
* Institut Laue Langevin, Grenoble, France
*
* %I
* Written by: Peter Willendrup, derived from TOF_lambda_monitor.comp
* Date: May 23, 2012
* Version: $Revision: 4587 $
* Origin: DTU Physics
* Release: McStas 1.12c
*
* Special "Brilliance" monitor of FIXED size 1x1cm.
*
* %D
* If used in the right setting, will output "instantaneous" and "mean" brilliances in units of Neutrons/cm^2/ster/AA/s. Conditions for proper units:
* <ul>
* <li>Use a with a source of area 1x1cm
* <li>The source must illuminate/focus to an area of 1x1cm a 1m distance
* <li>Parametrise the Brilliance_monitor with the frequency of the source
* <li>To not change the source TOF distribution, place the Brilliance monitor close to the source!
* </ul>
*
* with a source of area 1x1cm illuminating/focusing to an area of 1x1cm a 1m distance, this monitor will output "instantaneous" and "mean" brilliances in units of Neutrons/cm^2/ster/AA/s
*
* Here is an example of the use of the component. Note how the mentioned Unit conditions are implemented in instrument code.
*
*COMPONENT Source = ESS_moderator_long(
* l_low = lambdamin, l_high = lambdamax, dist = 1, xw = 0.01, yh = 0.01,
* freq = 14, T=50, tau=287e-6, tau1=0, tau2=20e-6,
* n=20, n2=5, d=0.00286, chi2=0.9, I0=6.9e11, I2=27.6e10,
* branch1=0, branch2=0.5, twopulses=0, size=0.01)
* AT (0, 0, 0) RELATIVE Origin
*
*COMPONENT BRIL = Brilliance_monitor(nlam=196,nt=401,filename="bril.sim",
* t_0=0,t_1=4000,lambda_0=lambdamin,
* lambda_1=lambdamax, Freq=14)
*AT (0,0,0.000001) RELATIVE Source
*
* %P
* INPUT PARAMETERS:
*
* nlam: Number of bins in wavelength (1)
* nt: Number of bins in TOF (1)
* t_0: Minimum time (us)
* t_1: Maximum time (us)
* lambda_0: Minimum wavelength detected (AA)
* lambda_1: Maximum wavelength detected (AA)
* filename: Defines filenames for the detector images. Stored as:<br>Peak_<filename> and Mean_<filename> (string)
* restore_neutron: If set, the monitor does not influence the neutron state (1)
* Freq: Source frequency. Use freq=1 for reactor source (Hz)
* srcarea: Source area (cm^2)
* tofcuts: Flag to generate TOF-distributions as function of wavelength (1)
* toflambda: Flag to generate TOF-lambda distribution output ยด (1)
*
* CALCULATED PARAMETERS:
*
* Div_N: Array of neutron counts
* Div_p: Array of neutron weight counts
* Div_p2: Array of second moments
*
* %E
*******************************************************************************/
DEFINE COMPONENT Brilliance_monitor
DEFINITION PARAMETERS (nlam=101, nt=1001, string filename, t_0=0, t_1=20000, srcarea=1)
SETTING PARAMETERS (lambda_0=0, lambda_1=20, restore_neutron=0, Freq, int tofcuts=0, int toflambda=0)
OUTPUT PARAMETERS (tt_0, tt_1, BRIL_N, BRIL_p, BRIL_p2, BRIL_mean, BRIL_peak, BRIL_meanN, BRIL_peakN, BRIL_meanE, BRIL_peakE)
// STATE PARAMETERS (x,y,z,vx,vy,vz,t,s1,s2,p)
// POLARISATION PARAMETERS (sx,sy,sz)
DECLARE
%{
double BRIL_N[nt][nlam];
double BRIL_p[nt][nlam];
double BRIL_p2[nt][nlam];
double BRIL_mean[nlam];
double BRIL_meanN[nlam];
double BRIL_meanE[nlam];
double BRIL_peak[nlam];
double BRIL_peakN[nlam];
double BRIL_peakE[nlam];
double BRIL_shape[nt];
double BRIL_shapeN[nt];
double BRIL_shapeE[nt];
double tt_0, tt_1;
double xmin=-0.005, xmax=0.005, ymin=-0.005, ymax=0.005;
double ster=1e-4;
double prsec=1e-6;
double dlam;
double dt;
%}
INITIALIZE
%{
int i,j;
tt_0 = t_0*prsec;
tt_1 = t_1*prsec;
dt=(t_1-t_0)*prsec/nt;
dlam=(lambda_1-lambda_0)/(nlam-1);
for (i=0; i<nlam; i++)
{
BRIL_mean[i] = 0;
BRIL_peak[i] = 0;
BRIL_meanN[i] = 0;
BRIL_peakN[i] = 0;
BRIL_meanE[i] = 0;
BRIL_peakE[i] = 0;
for (j=0; j<nt; j++)
{
BRIL_N[j][i] = 0;
BRIL_p[j][i] = 0;
BRIL_p2[j][i] = 0;
if (i==0) {
BRIL_shape[j] = 0;
BRIL_shapeN[j] = 0;
BRIL_shapeE[j] = 0;
}
}
}
%}
TRACE
%{
int i,j;
double div;
double lambda;
double Pnorm;
PROP_Z0;
lambda = (2*PI/V2K)/sqrt(vx*vx + vy*vy + vz*vz);
if (x>xmin && x<xmax && y>ymin && y<ymax &&
lambda > lambda_0 && lambda < lambda_1)
{
if (t < tt_1 && t > tt_0)
{
i = floor((lambda - lambda_0)*nlam/(lambda_1 - lambda_0));
j = floor((t-tt_0)*nt/(tt_1-tt_0));
Pnorm=p/dlam/ster/srcarea;
BRIL_meanN[i]++;
BRIL_mean[i] += Pnorm;
BRIL_meanE[i] += Pnorm*Pnorm;
Pnorm=Pnorm/Freq/dt;
BRIL_N[j][i]++;
BRIL_p[j][i] += Pnorm;
BRIL_p2[j][i] += Pnorm*Pnorm;
}
}
if (restore_neutron) {
RESTORE_NEUTRON(INDEX_CURRENT_COMP, x, y, z, vx, vy, vz, t, sx, sy, sz, p);
}
%}
SAVE
%{
/* First, dump the 2D monitor */
/* For each Wavelength channel, find peak brilliance */
int i,j,jmax;
double Pnorm;
char ff[256];
char tt[256];
for (i=0; i<nlam; i++)
{
Pnorm = -1;
jmax = -1;
for (j=0; j<nt; j++)
{
if (BRIL_p[j][i]>=Pnorm)
{
Pnorm = BRIL_p[j][i];
jmax=j;
}
BRIL_shape[j] = BRIL_p[j][i];
BRIL_shapeN[j] = BRIL_N[j][i];
BRIL_shapeE[j] = BRIL_p2[j][i];
}
if (tofcuts == 1) {
sprintf(ff, "Shape_%s_%g",filename,lambda_0+i*dlam);
sprintf(tt, "Peak shape at %g AA",lambda_0+i*dlam);
DETECTOR_OUT_1D(
tt,
"TOF [us]",
"Peak Brilliance",
"Shape", t_0, t_1, nt,
&BRIL_shapeN[0],&BRIL_shape[0],&BRIL_shapeE[0],
ff);
}
BRIL_peakN[i] = BRIL_N[jmax][i];
BRIL_peak[i] = BRIL_p[jmax][i];
BRIL_peakE[i] = BRIL_p2[jmax][i];
}
sprintf(ff, "Mean_%s",filename);
DETECTOR_OUT_1D(
"Mean brilliance",
"Wavelength [AA]",
"Mean Brilliance",
"Mean", lambda_0, lambda_1, nlam,
&BRIL_meanN[0],&BRIL_mean[0],&BRIL_meanE[0],
ff);
sprintf(ff, "Peak_%s",filename);
DETECTOR_OUT_1D(
"Peak brilliance",
"Wavelength [AA]",
"Peak Brilliance",
"Peak", lambda_0, lambda_1, nlam,
&BRIL_peakN[0],&BRIL_peak[0],&BRIL_peakE[0],
ff);
/* MPI related NOTE: Order is important here! The 2D-data used to generate wavelength-slices and calculate
the peak brilliance should be done LAST, otherwise we will get a factor of MPI_node_count too much as
scatter/gather has been performed on the arrays... */
if (toflambda == 1) {
sprintf(ff, "TOFL_%s",filename);
DETECTOR_OUT_2D(
"TOF-wavelength brilliance",
"Time-of-flight [\\gms]", "Wavelength [AA]",
t_0, t_1, lambda_0, lambda_1,
nt, nlam,
&BRIL_N[0][0],&BRIL_p[0][0],&BRIL_p2[0][0],
filename);
}
%}
MCDISPLAY
%{
multiline(5, (double)xmin, (double)ymin, 0.0,
(double)xmax, (double)ymin, 0.0,
(double)xmax, (double)ymax, 0.0,
(double)xmin, (double)ymax, 0.0,
(double)xmin, (double)ymin, 0.0);
%}
END
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