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Update SANS_Spheres to align with analytical validations. #2083

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Merged
willend merged 2 commits into from
Aug 4, 2025
Merged

Update SANS_Spheres to align with analytical validations. #2083

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3c5635a
Update SANS_Spheres to align with analytical validations.
Lomholy Jul 23, 2025
609be7c
Update target intensity value for examples affected by the change in …
Lomholy Jul 23, 2025
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2 changes: 1 addition & 1 deletion mcstas-comps/examples/Templates/templateSANS/templateSANS.instr
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,7 @@
* %Description
* Very simple test instrument for the Sans_spheres component
*
* %Example: lambda=6 Detector: detector_I=5.5587E-17
* %Example: lambda=6 Detector: detector_I=0.0445623
*
* %Parameters
* lambda: [AA] Mean wavelength of neutrons
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10 changes: 4 additions & 6 deletions mcstas-comps/samples/Sans_spheres.comp
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Expand Up @@ -100,16 +100,15 @@ if (xwidth && yheight && zdepth) shape=1; /* box */
target_z=1;
}

my_a_v = sigma_abs*2200*100; /* Is not yet divided by v. 100: Convert barns -> fm^2 */
my_a_v = sigma_abs*2200; /* Is not yet divided by v.*/

my_s_pre = Phi * 4*PI*R*R*R/3 * Delta_rho*Delta_rho;

%}
TRACE
%{
double t0, t1, v, l_full, l, l_1, dt, d_phi, theta, my_s;
double aim_x=0, aim_y=0, aim_z=1, axis_x, axis_y, axis_z;
double arg, tmp_vx, tmp_vy, tmp_vz, vout_x, vout_y, vout_z;
double t0, t1, v, l_full, l, l_1, dt, my_s;
double aim_x=0, aim_y=0, aim_z=1;
double f, solid_angle, vx_i, vy_i, vz_i, qx, qy, qz,q;
char intersect=0;

Expand Down Expand Up @@ -159,8 +158,7 @@ TRACE

f = 3 * (sin(q*R) - q*R*cos(q*R))/(q*R*q*R*q*R);

l_1 = v*t1;
double pmul=l_full*solid_angle/(4*PI)*my_s_pre*f*f*exp(-my_a_v*(l+l_1)/v);
double pmul=l_full*solid_angle/(4*PI)*my_s_pre*f*f*exp(-(my_a_v/v)*l_full);
p = p * pmul;
SCATTER;
}
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