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[u/mrichter/AliRoot.git] / PWG2 / FEMTOSCOPY / AliFemto / SystemOfUnits.h
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67427ff7 1/***************************************************************************
2 *
3 * $Id$
4 *
5 * Author: blasiuk adapted from CLHEP
6 ***************************************************************************
7 *
8 * Description: This file is based on the SystemOfUnits provided
9 * in the CLHEP library v1.2: The units remain the same.
10 * It is just the naming conventions that are different:
11 *
12 * 1) No single letter unit:
13 * : m --> meter
14 * : s --> second
15 * : g --> gram
16 *
17 * 2) All prefixes are spelled out explicitly (except electron Volt):
18 * : ns --> nanosecond
19 * : mm --> millimeter
20 *
21 * 3) All units with proper names follow the international standard
22 * of being lower case:
23 * : farad --> farad
24 * : volt --> volt
25 *
26 * The basic units are :
27 * centimeter (centimeter)
28 * second (second)
29 * Giga electron Volt (GeV)
30 * positron charge (eplus)
31 * degree Kelvin (kelvin)
32 * the amount of substance (mole)
33 * radian (radian)
34 * steradian (steradian)
35 ***************************************************************************
36 *
37 * $Log$
ea77036b 38 * Revision 1.1.2.1 2007/10/05 09:38:17 akisiel
39 * Fix stray colons
40 *
41 * Revision 1.1 2007/05/16 10:22:12 akisiel
42 * Making the directory structure of AliFemto flat. All files go into one common directory
43 *
d0e92d9a 44 * Revision 1.1.1.1 2007/04/25 15:38:41 panos
45 * Importing the HBT code dir
46 *
67427ff7 47 * Revision 1.1.1.1 2007/03/07 10:14:49 mchojnacki
48 * First version on CVS
49 *
50 * Revision 1.5 2003/09/02 17:59:35 perev
51 * gcc 3.2 updates + WarnOff
52 *
53 * Revision 1.4 1999/03/22 16:21:38 fisyak
54 * Add anti CINT flags
55 *
56 * Revision 1.3 1999/03/11 14:53:07 ullrich
57 * Added definition of inch.
58 *
59 * Revision 1.2 1999/03/02 20:15:08 ullrich
60 * Added millivolt.
61 *
62 * Revision 1.1 1999/01/30 03:59:06 fisyak
63 * Root Version of StarClassLibrary
64 *
65 * Revision 1.1 1999/01/23 00:28:08 ullrich
66 * Initial Revision
67 *
68 **************************************************************************/
69#ifndef HEP_SYSTEM_OF_UNITS_H
70#define HEP_SYSTEM_OF_UNITS_H
71
72
73#ifndef M_PI
74#define M_PI 3.14159265358979312
75#endif
76
77
78namespace units {
79 // new macro for CLHEP SystemOfUnits: at end of file
80 // ST_ADD_OLD_CLHEP_SYSTEM_OF_UNITS
81 //
82 // Length [L]
83 //
84 static const double millimeter = 0.1;
85 static const double millimeter2 = millimeter*millimeter;
86 static const double millimeter3 = millimeter*millimeter*millimeter;
87
88 static const double centimeter = 10*millimeter;
89 static const double centimeter2 = centimeter*centimeter;
90 static const double centimeter3 = centimeter*centimeter*centimeter;
91
92 static const double meter = 100.*centimeter;
93 static const double meter2 = meter*meter;
94 static const double meter3 = meter*meter*meter;
95
96 static const double kilometer = 1000.*meter;
97 static const double kilometer2 = kilometer*kilometer;
98 static const double kilometer3 = kilometer*kilometer*kilometer;
99
100 static const double micrometer = 1.e-6*meter;
101 static const double nanometer = 1.e-9*meter;
102 static const double femtometer = 1.e-15*meter;
103 static const double fermi = 1*femtometer;
104
105 static const double barn = 1.e-28*meter2;
106 static const double millibarn = 1.e-3*barn;
107 static const double microbarn = 1.e-6*barn;
108 static const double nanobarn = 1.e-9*barn;
109 static const double inch = 2.54*centimeter;
110
111 //
112 // Angle
113 //
114 static const double radian = 1.;
115 static const double milliradian = 1.e-3*radian;
116#ifndef __CINT__
117 static const double degree = (M_PI/180.0)*radian;
118#endif
119 static const double steradian = 1.;
120
121 //
122 // Time [T]
123 //
124 static const double second = 1;
125 static const double millisecond = 1.e-3*second;
126 static const double microsecond = 1.e-3*millisecond;
127 static const double nanosecond = 1.e-3*microsecond;
128
129 static const double hertz = 1./second;
130 static const double kilohertz = 1.e+3*hertz;
131 static const double Megahertz = 1.e+6*hertz;
132
133 // but these are also unambiguous and unlikely to be used as variable!
134 static const double Hz = 1*hertz;
135 static const double kHz = 1*kilohertz;
136 static const double MHz = 1*Megahertz;
137
138 //
139 // Electric charge [Q]
140 //
141 static const double eplus = 1. ; // positron charge
142 static const double e_SI = 1.60217733e-19; // positron charge in coulomb
143 static const double coulomb = eplus/e_SI;
144
145 //
146 // Energy [E]
147 //
148 static const double Gigaelectronvolt = 1.;
149 static const double Megaelectronvolt = 1.e-3*Gigaelectronvolt;
150 static const double electronvolt = 1.e-6*Megaelectronvolt;
151 static const double kiloelectronvolt = 1.e+3*electronvolt;
152 static const double Teraelectronvolt = 1.e+3*Gigaelectronvolt;
153
154 // but these are also unambiguous and unlikely to be used as variables
155 static const double MeV = Megaelectronvolt;
156 static const double eV = electronvolt;
157 static const double keV = kiloelectronvolt;
158 static const double GeV = Gigaelectronvolt;
159 static const double TeV = Teraelectronvolt;
160
161 static const double joule = electronvolt/e_SI;
162
163 //
164 // Mass [E][T^2][L^-2]
165 //
166 static const double kilogram = joule*second*second/(meter*meter);
167 static const double gram = 1.e-3*kilogram;
168 static const double milligram = 1.e-3*gram;
169
170 //
171 // Power [E][T^-1]
172 //
173 static const double watt = joule/second;
174
175 //
176 // Force [E][L^-1]
177 //
178 static const double newton = joule/meter;
179
180 //
181 // Pressure [E][L^-3]
182 //
183#ifndef __CINT__
184#define pascal hep_pascal // a trick to avoid warnings
185 static const double hep_pascal = newton/meter2;
186#else
187 static const double pascal = newton/meter2;
188#endif
189 static const double bar = 100000*pascal;
190 static const double atmosphere = 101325*pascal;
191
192 //
193 // Electric current [Q][T^-1]
194 //
195 static const double ampere = coulomb/second;
196
197 //
198 // Electric potential [E][Q^-1]
199 //
200 static const double Megavolt = MeV/eplus;
201 static const double kilovolt = 1.e-3*Megavolt;
202 static const double volt = 1.e-6*Megavolt;
203 static const double millivolt = 1.e-3*volt;
204
205 //
206 // Electric resistance [E][T][Q^-2]
207 //
208 static const double ohm = volt/ampere;
209
210 //
211 // Electric capacitance [Q^2][E^-1]
212 //
213 static const double farad = coulomb/volt;
214 static const double millifarad = 1.e-3*farad;
215 static const double microfarad = 1.e-6*farad;
216 static const double nanofarad = 1.e-9*farad;
217 static const double picofarad = 1.e-12*farad;
218
219 //
220 // Magnetic Flux [T][E][Q^-1]
221 //
222 static const double weber = volt*second;
223
224 //
225 // Magnetic Field [T][E][Q^-1][L^-2]
226 //
227 static const double tesla = volt*second/meter2;
228
229 static const double gauss = 1.e-4*tesla;
230 static const double kilogauss = 1.e-1*tesla;
231
232 //
233 // Inductance [T^2][E][Q^-2]
234 //
235 static const double henry = weber/ampere;
236
237 //
238 // Temperature
239 //
240 static const double kelvin = 1.;
241
242 //
243 // Amount of substance
244 //
245 static const double mole = 1.;
246
247 //
248 // Activity [T^-1]
249 //
250 static const double becquerel = 1./second;
251 static const double curie = 3.7e+10 * becquerel;
252
253 //
254 // Absorbed dose [L^2][T^-2]
255 //
256 static const double gray = joule/kilogram ;
257
258 //
259 // Miscellaneous
260 //
261 static const double perCent = 0.01 ;
262 static const double perThousand = 0.001;
263 static const double perMillion = 0.000001;
264
265#ifdef ST_ADD_OLD_CLHEP_SYSTEM_OF_UNITS
266
267 static const double mm = 0.1; // millimeter
268 static const double mm2 = mm*mm;
269 static const double mm3 = mm*mm*mm;
270
271 static const double cm = 10.*mm; // centimeter
272 static const double cm2 = cm*cm;
273 static const double cm3 = cm*cm*cm;
274
275 static const double m = 1000.*mm; // meter
276 static const double m2 = m*m;
277 static const double m3 = m*m*m;
278
279 static const double km = 1000.*m; // kilometer
280 static const double km2 = km*km;
281 static const double km3 = km*km*km;
282
283 static const double microm = 1.e-6*m; // micro meter
284 static const double nanom = 1.e-9*m;
285 //static const double fermi = 1.e-15*m;
286
287 //
288 // Angle
289 //
290 static const double rad = 1.; // radian
291 static const double mrad = 1.e-3*rad; // milliradian
292 static const double deg = (M_PI/180.0)*rad;
293
294 static const double st = 1.; // steradian
295
296 //
297 // Time [T]
298 //
299 static const double s = 1; // second
300 static const double ns = 1.e-9*s; // nano second
301 static const double ms = 1.e-3*s; // milli second
302
303 // Mass [E][T^2][L^-2]
304 //
305 static const double kg = joule*second*second/(meter*meter); // kg = 6.24150 e+24 * MeV*ns*ns/(mm*mm)
306 static const double g = 1.e-3*kg;
307 static const double mg = 1.e-3*g;
308
309#endif
310
ea77036b 311}
67427ff7 312using namespace units;
313#endif /* HEP_SYSTEM_OF_UNITS_H */