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/************************************************************************
*
* McXtrace, X-ray tracing package
* Copyright, All rights reserved
* DTU Physics, Kgs. Lyngby, Denmark
* Synchrotron SOLEIL, Saint-Aubin, France
*
*
* Component: Source_genesis
*
* %Identification
* Written by: Erik B Knudsen
* Date: Aug. 10th, 2014
* Origin: Risoe
* Release: McXtrace 1.2
*
* Interface source for importing Simplex generated X-ray pulses into McXtrace
*
* %Description
* This source model reads the dumped radiation field output from Simplex and samples it to be used
* in McXtrace.
*
* %Parameters
* focus_xw: [m] Width of target.
* focus_yh: [m] Height of target.
* dist: [m] Distance to target along z axis.
* E0: [keV] Mean energy of xrays.
* dE: [keV] Energy half spread of x-rays.
* fname: [string] Filename of main output file of GENESIS 1.3.
* meshsize: [m] Spacing between mesh points (equal in x and y).
* gridpoints: [int] Number of mesh points along 1 axis.
* s0: [m] Back end of pulse time sampling windows scaled by c^-1.
* s1: [m] Front end of pulse time sampling window scaled by c^-1.
* focus_a: [rad] Mean divergence angle.
* nslices: [1] Number of slices simulated.
* flux: [1] Flux-multiplier.
*
* %Link
* Tanaka, Journal of Synchrotron Radiation 22, 1319 (2015) http://journals.iucr.org/s/issues/2015/05/00/gb5029/
* http://radiant.harima.riken.go.jp/simplex/
*
* %End
*****************************************************************************/
DEFINE COMPONENT Source_simplex
SETTING PARAMETERS (int gridpoints=101, string fname="template.fld",focus_xw=0,focus_yh=0,dist=1,E0=0, dE=0,
meshsize=1e-5, int nslices=102, s0=-2e-3,s1=2e-3,flux=1.0, focus_a=0.1)
SHARE
%{
%include "read_table-lib"
#include <complex.h>
struct Ssimplex_struct {
double l0,dl;
double s0,s1;
double pmul,pint;
t_Table T;
double complex **dfl;
};
%}
DECLARE
%{
double e;
struct Ssimplex_struct prms;
%}
INITIALIZE
%{
/*open the main output file and parse for parameters*/
/*skip this for now*/
char dflfn[512];
FILE *dflfp;
int k;
int l;
int m;
float *r;
float *i;
r=malloc(gridpoints*sizeof(float));
i=malloc(gridpoints*sizeof(float));
strncpy(dflfn,fname,502);
strncat(dflfn,".fld",4);
/*allocate storage for the input array*/
if( (prms.dfl=calloc(nslices,sizeof(double complex *)))==NULL){
fprintf(stderr,"Error(%s): allocation failed for slice array. Aborting.\n",NAME_CURRENT_COMP);
exit(-1);
}
if( (dflfp=Open_File(dflfn,"r", NULL))==NULL){
fprintf(stderr,"Error(%s): cannot open file %s for reading- Aborting.\n",NAME_CURRENT_COMP,dflfn);
exit(-1);
}
for (k=0;k<nslices;k++){
/*printf("alloc'ing for slice %d...",k);*/
if( (prms.dfl[k]=calloc(gridpoints*gridpoints,sizeof(double complex)))==NULL) {
fprintf(stderr,"Error(%s): allocation failed for slice %d. Aborting.\n",NAME_CURRENT_COMP,k);
exit(-1);
}
/*printf("done\n");*/
/*so read the data*/
/*printf("reading for slice %d...",k);*/
for (l=0;l<gridpoints;l++){
int s=0;
for (m=0;m<gridpoints;m++){
s+=fread(r+m,sizeof(float),1,dflfp);
s+=fread(i+m,sizeof(float),1,dflfp);
}
if(s!=2*gridpoints){
fprintf(stderr,"Error(%s): input data not read cleanly (slice %d, row %d)\n",NAME_CURRENT_COMP,k,l);
}
for (m=0;m<gridpoints;m++){
prms.dfl[k][l*gridpoints+m]=r[m]+I*i[m];
}
}
/*printf("done\n");*/
}
free(r);
free(i);
prms.pmul=flux/(double)mcget_ncount();
%}
TRACE
%{
double xwidth,yheight,k;
double theta_x,theta_y;
double alpha,beta;
double complex cp,cp2,t0,t1;
int ix,iy,is;
double ds,s,deltas;
xwidth=(gridpoints-1)*meshsize;
yheight=(gridpoints-1)*meshsize;
/*sample x and y from gridsize*/
x=(rand01()-0.5)*xwidth;
y=(rand01()-0.5)*yheight;
ix=(int)((x+0.5*xwidth)/meshsize);
if(ix==gridpoints) ix--;
iy=(int)((y+0.5*yheight)/meshsize);
if(iy==gridpoints) iy--;
/*sample s inbetween s and s0 and s1*/
s=rand01()*(s1-s0);
deltas=(s1-s0)/(nslices-1);
/*which slice is closest*/
is=(int)(s/deltas+0.5);
if(is==nslices) is--;
t=(s+s0)/M_C;
alpha=( (x+0.5*xwidth - ix*meshsize) /meshsize );
beta= ( (y+0.5*yheight - iy*meshsize) /meshsize );
t0=(1-alpha)*prms.dfl[is][iy*gridpoints+ix] + alpha*prms.dfl[is][iy*gridpoints+ix+1];
t1=(1-alpha)*prms.dfl[is][(iy+1)*gridpoints+ix] + alpha*prms.dfl[is][(iy+1)*gridpoints+ix+1];
cp = (1-beta)*t0+beta*t1;
/*cp now contains the complex radiation field at x,y*/
p=prms.pmul*cabs(cp);
phi=carg(cp);
theta_x=(randnorm())*focus_a;
theta_y=(randnorm())*focus_a;
/*draw random coordinates in the acceptance window*/
kx=tan(theta_x);
ky=tan(theta_y);
kz=1;
NORM(kx,ky,kz);
k=E0*E2K;
kx*=k;
ky*=k;
kz*=k;
/*set polarization vector*/
Ex=0;Ey=0;Ez=0;
%}
FINALLY
%{
Table_Free(&(prms.T));
%}
MCDISPLAY
%{
double radius=0.05;
circle("xy",0,0,0,radius);
circle("xz",0,0,0,radius);
circle("yz",0,0,0,radius);
%}
END
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