1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <gsl/gsl_errno.h>
#include <gsl/gsl_spline.h>
#include <math.h>
#include "optics.h"
#include "quantum_efficiency.h"
#include "solid_angle.h"
#include "pdg.h"
#include "vector.h"
#include "proton.h"
#include "sno.h"
#include "scattering.h"
#include "pmt_response.h"
#include "misc.h"
#include "util.h"
static int initialized = 0;
static double *x, *dEdx_rad, *dEdx, *csda_range;
static size_t size;
static gsl_interp_accel *acc_dEdx_rad;
static gsl_spline *spline_dEdx_rad;
static gsl_interp_accel *acc_dEdx;
static gsl_spline *spline_dEdx;
static gsl_interp_accel *acc_range;
static gsl_spline *spline_range;
static int init()
{
int i, j;
char line[256];
char *str;
double value;
int n;
FILE *f = open_file("proton_water_liquid.txt", "r");
if (!f) {
fprintf(stderr, "failed to open proton_water_liquid.txt: %s\n", strerror(errno));
return -1;
}
i = 0;
n = 0;
/* For the first pass, we just count how many values there are. */
while (fgets(line, sizeof(line), f)) {
size_t len = strlen(line);
if (len && (line[len-1] != '\n')) {
fprintf(stderr, "got incomplete line on line %i: '%s'\n", i, line);
goto err;
}
i += 1;
/* Skip the first 8 lines since it's just a header. */
if (i <= 8) continue;
if (!len) continue;
else if (line[0] == '#') continue;
str = strtok(line," \n");
while (str) {
value = strtod(str, NULL);
str = strtok(NULL," \n");
}
n += 1;
}
x = malloc(sizeof(double)*n);
dEdx_rad = malloc(sizeof(double)*n);
dEdx = malloc(sizeof(double)*n);
csda_range = malloc(sizeof(double)*n);
size = n;
i = 0;
n = 0;
/* Now, we actually store the values. */
rewind(f);
while (fgets(line, sizeof(line), f)) {
size_t len = strlen(line);
if (len && (line[len-1] != '\n')) {
fprintf(stderr, "got incomplete line on line %i: '%s'\n", i, line);
goto err;
}
i += 1;
/* Skip the first 8 lines since it's just a header. */
if (i <= 8) continue;
if (!len) continue;
else if (line[0] == '#') continue;
str = strtok(line," \n");
j = 0;
while (str) {
value = strtod(str, NULL);
switch (j) {
case 0:
x[n] = value;
break;
case 2:
dEdx_rad[n] = value;
break;
case 3:
dEdx[n] = value;
break;
case 4:
csda_range[n] = value;
break;
}
j += 1;
str = strtok(NULL," \n");
}
n += 1;
}
fclose(f);
acc_dEdx_rad = gsl_interp_accel_alloc();
spline_dEdx_rad = gsl_spline_alloc(gsl_interp_linear, size);
gsl_spline_init(spline_dEdx_rad, x, dEdx_rad, size);
acc_dEdx = gsl_interp_accel_alloc();
spline_dEdx = gsl_spline_alloc(gsl_interp_linear, size);
gsl_spline_init(spline_dEdx, x, dEdx, size);
acc_range = gsl_interp_accel_alloc();
spline_range = gsl_spline_alloc(gsl_interp_linear, size);
gsl_spline_init(spline_range, x, csda_range, size);
initialized = 1;
return 0;
err:
fclose(f);
return -1;
}
double proton_get_range(double T, double rho)
{
/* Returns the approximate range a proton with kinetic energy `T` will travel
* in water before losing all of its energy. This range is interpolated
* based on data from the PDG which uses the continuous slowing down
* approximation.
*
* `T` should be in MeV, and `rho` should be in g/cm^3.
*
* Return value is in cm.
*
* See http://pdg.lbl.gov/2018/AtomicNuclearProperties/adndt.pdf. */
if (!initialized) {
if (init()) {
exit(1);
}
}
return gsl_spline_eval(spline_range, T, acc_range)/rho;
}
double proton_get_dEdx_rad(double T, double rho)
{
/* Returns the approximate radiative dE/dx for a proton in water with
* kinetic energy `T`.
*
* `T` should be in MeV and `rho` in g/cm^3.
*
* Return value is in MeV/cm.
*
* See http://pdg.lbl.gov/2018/AtomicNuclearProperties/adndt.pdf. */
if (!initialized) {
if (init()) {
exit(1);
}
}
if (T < spline_dEdx_rad->x[0]) return spline_dEdx_rad->y[0];
return gsl_spline_eval(spline_dEdx_rad, T, acc_dEdx_rad)*rho;
}
double proton_get_dEdx(double T, double rho)
{
/* Returns the approximate dE/dx for a proton in water with kinetic energy
* `T`.
*
* `T` should be in MeV and `rho` in g/cm^3.
*
* Return value is in MeV/cm.
*
* See http://pdg.lbl.gov/2018/AtomicNuclearProperties/adndt.pdf. */
if (!initialized) {
if (init()) {
exit(1);
}
}
if (T < spline_dEdx->x[0]) return spline_dEdx->y[0];
return gsl_spline_eval(spline_dEdx, T, acc_dEdx)*rho;
}
|
