move everything to src directory

1 files changed, 0 insertions, 318 deletions

diff --git a/calculate_limits.c b/calculate_limits.c
deleted file mode 100644
index 6dd37f0..0000000
--- a/calculate_limits.c
+++ /dev/null
@@ -1,318 +0,0 @@
-#include <stdio.h>
-#include <gsl/gsl_integration.h>
-#include <math.h> /* For M_PI */
-
-/* Mass of dark matter particle (MeV). */
-double mass = 1000.0;
-
-/* Decay length of mediator V (in mm). */
-double decay_length = 1000e9;
-
-/* Cross section for dark matter interaction (in mm^2). */
-double dm_cross_section = 1e-30;
-
-/* Approximate dark matter density in MeV/mm^3. From Tom Caldwell's thesis. */
-double dm_density = 400e3;
-
-/* Approximate dark matter velocity in mm/s. The true distribution is expected
- * to be a Maxwell Boltzmann distribution which is modulated annually by the
- * earth's rotation around the sun, but we just assume a single constant
- * velocity here. From Tom Caldwell's thesis page 26. */
-double dm_velocity = 244e6;
-
-/* Number density of scatterers in the Earth.
- *
- * FIXME: Currently just set to the number density of atoms in water. Need to
- * update this for rock, and in fact this will change near the detector since
- * there is water outside the AV. */
-double number_density = 30e18; /* In 1/mm^3 */
-
-/* From Google maps. Probably not very accurate, but should be good enough for
- * this calculation. */
-double latitude = 46.471857;
-double longitude = -81.186755;
-
-/* Radius of the earth in mm. */
-double radius_earth = 6.371e9;
-
-/* Depth of the SNO detector in mm. Don't be fooled by all the digits. I just
- * converted 6800 feet -> mm. */
-double sno_depth = 2072640;
-
-/* Fiducial volume in mm. */
-double radius_fiducial = 5000;
-
-/* Cartesian coordinates of SNO in earth frame. They need to be global since
- * they are used in some functions. */
-double x_sno[3];
-
-double epsabs = 1e-1;
-double epsrel = 1e-1;
-
-double deg2rad(double deg)
-{
-    return deg*M_PI/180.0;
-}
-
-double rad2deg(double rad)
-{
-    return rad*180.0/M_PI;
-}
-
-/* Convert spherical coordinates to cartesian coordinates.
- *
- * See https://en.wikipedia.org/wiki/Spherical_coordinate_system. */
-void sphere2cartesian(double r, double theta, double phi, double *x, double *y, double *z)
-{
-    *x = r*sin(theta)*cos(phi);
-    *y = r*sin(theta)*sin(phi);
-    *z = r*cos(theta);
-}
-
-/* Convert cartesian coordinates to spherical coordinates.
- *
- * See https://en.wikipedia.org/wiki/Spherical_coordinate_system. */
-void cartesian2sphere(double x, double y, double z, double *r, double *theta, double *phi)
-{
-    *r = sqrt(x*x + y*y + z*z);
-    *theta = acos(z/(*r));
-    *phi = atan2(y,x);
-}
-
-void cross(double *a, double *b, double *c)
-{
-    c[0] = a[1]*b[2] - a[2]*b[1];
-    c[1] = a[2]*b[0] - a[0]*b[2];
-    c[2] = a[0]*b[1] - a[1]*b[0];
-}
-
-double dot(double *a, double *b)
-{
-    return a[0]*b[0] + a[1]*b[1] + a[2]*b[2];
-}
-
-double norm(double *a)
-{
-    return sqrt(dot(a,a));
-}
-
-void normalize(double *a)
-{
-    double n = norm(a);
-    a[0] /= n;
-    a[1] /= n;
-    a[2] /= n;
-}
-
-/* Rotate a vector x around the vector dir by an angle theta. */
-void rotate(double *result, double *x, double *dir, double theta)
-{
-    double a = dot(dir,x);
-    double b[3];
-
-    double sin_theta = sin(theta);
-    double cos_theta = cos(theta);
-
-    /* Make sure the direction vector is normalized. */
-    normalize(dir);
-
-    cross(x,dir,b);
-
-    result[0] = x[0]*cos_theta + dir[0]*a*(1-cos_theta) + b[0]*sin_theta;
-    result[1] = x[1]*cos_theta + dir[1]*a*(1-cos_theta) + b[1]*sin_theta;
-    result[2] = x[2]*cos_theta + dir[2]*a*(1-cos_theta) + b[2]*sin_theta;
-}
-
-/* Rotate a vector in earth centered coordinates to SNO coordinates (doesn't do
- * the translation). */
-void rotate_earth_to_sno(double *x_earth, double *x_sno)
-{
-    double dir[3];
-    double z[3] = {0,0,1};
-
-    cross(x_sno, z, dir);
-
-    /* Normalize. */
-    normalize(dir);
-
-    double theta = acos(dot(x_sno,z)/norm(x_sno));
-
-    rotate(x_sno, x_earth, dir, theta);
-}
-
-/* Integral over phi. */
-double f3(double phi, void *params)
-{
-    double result, error;
-    gsl_function F;
-    double *data = (double *) params;
-    data[5] = phi;
-    double x[3];
-    double r[3];
-    double distance;
-
-    /* Compute cartesian position in local SNO coordinates. */
-    sphere2cartesian(data[3], data[4], data[5], &x[0], &x[1], &x[2]);
-
-    /* Cartesian coordinates of gamma production offset in earth centered
-     * coordinates .*/
-    double *gamma_offset = data+6;
-
-    /* Vector distance between integration in local coordinates and gamma
-     * production point .*/
-    r[0] = x_sno[0] + x[0] - gamma_offset[0];
-    r[1] = x_sno[1] + x[1] - gamma_offset[1];
-    r[2] = x_sno[2] + x[2] - gamma_offset[2];
-
-    distance = norm(r);
-
-    return exp(-distance/decay_length)/(4*M_PI*distance*distance*decay_length)*data[3]*data[3]*sin(data[4]);
-}
-
-/* Integral over theta. */
-double f2(double theta, void *params)
-{
-    double result, error;
-    gsl_function F;
-    double *data = (double *) params;
-    data[4] = theta;
-
-    gsl_integration_workspace *w = gsl_integration_workspace_alloc(1000);
-
-    F.function = &f3;
-    F.params = params;
-
-    gsl_integration_qags(&F, 0, 2*M_PI, epsabs, epsrel, 1000, w, &result, &error);
-
-    gsl_integration_workspace_free(w);
-
-    return result;
-}
-
-/* Integral over r. */
-double f1(double r, void *params)
-{
-    double result, error;
-    gsl_function F;
-    double *data = (double *) params;
-    data[3] = r;
-
-    gsl_integration_workspace *w = gsl_integration_workspace_alloc(1000);
-
-    F.function = &f2;
-    F.params = params;
-
-    gsl_integration_qags(&F, 0, M_PI, epsabs, epsrel, 1000, w, &result, &error);
-
-    gsl_integration_workspace_free(w);
-
-    return result;
-}
-
-double f4_earth(double phi_earth, void *params)
-{
-    double result, error;
-    gsl_function F;
-    double *data = (double *) params;
-    data[2] = phi_earth;
-    double gamma_offset[3];
-
-    /* Compute the cartesian coordinates of the gamma production point in the
-     * earth centered coordinates. */
-    sphere2cartesian(data[0], data[1], data[2], &data[6], &data[7], &data[8]);
-
-    gsl_integration_workspace *w = gsl_integration_workspace_alloc(1000);
-
-    F.function = &f1;
-    F.params = params;
-
-    gsl_integration_qags(&F, 0, radius_fiducial, epsabs, epsrel, 1000, w, &result, &error);
-
-    gsl_integration_workspace_free(w);
-
-    /* For now we assume the event rate is constant throughout the earth, so we
-     * are implicitly assuming that the cross section is pretty small. */
-    double flux = dm_velocity*dm_density/mass;
-
-    return dm_cross_section*number_density*flux*result*data[0]*data[0]*sin(data[1]);
-}
-
-double f3_earth(double theta_earth, void *params)
-{
-    double result, error;
-    gsl_function F;
-    double *data = (double *) params;
-    data[1] = theta_earth;
-
-    gsl_integration_workspace *w = gsl_integration_workspace_alloc(1000);
-
-    F.function = &f4_earth;
-    F.params = params;
-
-    gsl_integration_qags(&F, 0, 2*M_PI, epsabs, epsrel, 1000, w, &result, &error);
-
-    gsl_integration_workspace_free(w);
-
-    return result;
-}
-
-double f2_earth(double r_earth, void *params)
-{
-    double result, error;
-    double data[9];
-    gsl_function F;
-    data[0] = r_earth;
-
-    gsl_integration_workspace *w = gsl_integration_workspace_alloc(1000);
-
-    F.function = &f3_earth;
-    F.params = (void *) data;
-
-    gsl_integration_qags(&F, 0, M_PI, epsabs, epsrel, 1000, w, &result, &error);
-
-    gsl_integration_workspace_free(w);
-
-    return result;
-}
-
-/* Returns the event rate in SNO for a self-destructing dark matter particle
- * with a mass of dm_mass, a dark photon decay length of gamma_length, and a
- * cross section of cs (in mm^2). */
-double get_event_rate(double dm_mass, double gamma_length, double cs)
-{
-    double result, error;
-    gsl_function F;
-
-    gsl_integration_workspace *w = gsl_integration_workspace_alloc(1000);
-
-    F.function = &f2_earth;
-    F.params = NULL;
-
-    /* For now we just use global variables. */
-    mass = dm_mass;
-    decay_length = gamma_length;
-    dm_cross_section = cs;
-
-    gsl_integration_qags(&F, 0, radius_earth, epsabs, epsrel, 1000, w, &result, &error);
-
-    gsl_integration_workspace_free(w);
-
-    return result;
-}
-
-int main(int argc, char **argv)
-{
-    /* Spherical angles for the SNO detector in the earth frame which has z
-     * along the north and south poles and the x axis passing through Greenwich.
-     * Should double check this. */
-    double sno_theta = deg2rad(latitude + 90.0);
-    double sno_phi = deg2rad(longitude);
-
-    sphere2cartesian(radius_earth - sno_depth, sno_theta, sno_phi, x_sno, x_sno+1, x_sno+2);
-
-    /* Calculate the event rate for a standard DM candidate with a mass of 1
-     * GeV, and a mediator decay length of 1 m. */
-    printf("event rate = %.18e Hz\n", get_event_rate(1000, 1000e9, 1e-30));
-
-    return 0;
-}