The Gaudi Framework  v33r0 (d5ea422b)
SystemOfUnits.py
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1 
15 
16 # This script is a direct adaptation of CLHEP/Units/SystemOfUnits.h
17 # and the following is the originial CLHEP comment:
18 #
19 # -----
20 # HEP coherent system of Units
21 #
22 # This file has been provided to CLHEP by Geant4 (simulation toolkit for HEP).
23 #
24 # The basic units are :
25 # millimeter (millimeter)
26 # nanosecond (nanosecond)
27 # Mega electron Volt (MeV)
28 # positron charge (eplus)
29 # degree Kelvin (kelvin)
30 # the amount of substance (mole)
31 # luminous intensity (candela)
32 # radian (radian)
33 # steradian (steradian)
34 #
35 # Below is a non exhaustive list of derived and pratical units
36 # (i.e. mostly the SI units).
37 # You can add your own units.
38 #
39 # The SI numerical value of the positron charge is defined here,
40 # as it is needed for conversion factor : positron charge = e_SI (coulomb)
41 #
42 # The others physical constants are defined in the header file :
43 # PhysicalConstants.h
44 #
45 # Authors: M.Maire, S.Giani
46 #
47 # History:
48 #
49 # 06.02.96 Created.
50 # 28.03.96 Added miscellaneous constants.
51 # 05.12.97 E.Tcherniaev: Redefined pascal (to avoid warnings on WinNT)
52 # 20.05.98 names: meter, second, gram, radian, degree
53 # (from Brian.Lasiuk@yale.edu (STAR)). Added luminous units.
54 # 05.08.98 angstrom, picobarn, microsecond, picosecond, petaelectronvolt
55 # 01.03.01 parsec
56 # -----
57 
58 #
59 # Length [L]
60 #
61 millimeter = 1.
62 millimeter2 = millimeter * millimeter
63 millimeter3 = millimeter * millimeter * millimeter
64 
65 centimeter = 10. * millimeter
66 centimeter2 = centimeter * centimeter
67 centimeter3 = centimeter * centimeter * centimeter
68 
69 meter = 1000. * millimeter
70 meter2 = meter * meter
71 meter3 = meter * meter * meter
72 
73 kilometer = 1000. * meter
74 kilometer2 = kilometer * kilometer
75 kilometer3 = kilometer * kilometer * kilometer
76 
77 parsec = 3.0856775807e+16 * meter
78 
79 micrometer = 1.e-6 * meter
80 nanometer = 1.e-9 * meter
81 angstrom = 1.e-10 * meter
82 fermi = 1.e-15 * meter
83 
84 barn = 1.e-28 * meter2
85 millibarn = 1.e-3 * barn
86 microbarn = 1.e-6 * barn
87 nanobarn = 1.e-9 * barn
88 picobarn = 1.e-12 * barn
89 
90 # symbols
91 mm = millimeter
92 mm2 = millimeter2
93 mm3 = millimeter3
94 
95 cm = centimeter
96 cm2 = centimeter2
97 cm3 = centimeter3
98 
99 m = meter
100 m2 = meter2
101 m3 = meter3
102 
103 km = kilometer
104 km2 = kilometer2
105 km3 = kilometer3
106 
107 pc = parsec
108 
109 #
110 # Angle
111 #
112 radian = 1.
113 milliradian = 1.e-3 * radian
114 degree = (3.14159265358979323846 / 180.0) * radian
115 
116 steradian = 1.
117 
118 # symbols
119 rad = radian
120 mrad = milliradian
121 sr = steradian
122 deg = degree
123 
124 #
125 # Time [T]
126 #
127 nanosecond = 1.
128 second = 1.e+9 * nanosecond
129 millisecond = 1.e-3 * second
130 microsecond = 1.e-6 * second
131 picosecond = 1.e-12 * second
132 femtosecond = 1.e-15 * second
133 
134 hertz = 1. / second
135 kilohertz = 1.e+3 * hertz
136 megahertz = 1.e+6 * hertz
137 
138 # symbols
139 ns = nanosecond
140 s = second
141 ms = millisecond
142 
143 #
144 # Electric charge [Q]
145 #
146 eplus = 1. # positron charge
147 e_SI = 1.60217733e-19 # positron charge in coulomb
148 coulomb = eplus / e_SI # coulomb = 6.24150 e+18 * eplus
149 
150 #
151 # Energy [E]
152 #
153 megaelectronvolt = 1.
154 electronvolt = 1.e-6 * megaelectronvolt
155 kiloelectronvolt = 1.e-3 * megaelectronvolt
156 gigaelectronvolt = 1.e+3 * megaelectronvolt
157 teraelectronvolt = 1.e+6 * megaelectronvolt
158 petaelectronvolt = 1.e+9 * megaelectronvolt
159 
160 joule = electronvolt / e_SI # joule = 6.24150 e+12 * MeV
161 
162 # symbols
163 MeV = megaelectronvolt
164 eV = electronvolt
165 keV = kiloelectronvolt
166 GeV = gigaelectronvolt
167 TeV = teraelectronvolt
168 PeV = petaelectronvolt
169 
170 #
171 # Mass [E][T^2][L^-2]
172 #
173 kilogram = joule * second * second / (meter * meter)
174 gram = 1.e-3 * kilogram
175 milligram = 1.e-3 * gram
176 
177 # symbols
178 kg = kilogram
179 g = gram
180 mg = milligram
181 
182 #
183 # Power [E][T^-1]
184 #
185 watt = joule / second # watt = 6.24150 e+3 * MeV/ns
186 
187 #
188 # Force [E][L^-1]
189 #
190 newton = joule / meter # newton = 6.24150 e+9 * MeV/mm
191 
192 #
193 # Pressure [E][L^-3]
194 #
195 hep_pascal = newton / m2 # pascal = 6.24150 e+3 * MeV/mm3
196 pascal = hep_pascal # a trick to avoid warnings
197 bar = 100000 * pascal # bar = 6.24150 e+8 * MeV/mm3
198 atmosphere = 101325 * pascal # atm = 6.32420 e+8 * MeV/mm3
199 
200 #
201 # Electric current [Q][T^-1]
202 #
203 ampere = coulomb / second # ampere = 6.24150 e+9 * eplus/ns
204 milliampere = 1.e-3 * ampere
205 microampere = 1.e-6 * ampere
206 nanoampere = 1.e-9 * ampere
207 
208 #
209 # Electric potential [E][Q^-1]
210 #
211 megavolt = megaelectronvolt / eplus
212 kilovolt = 1.e-3 * megavolt
213 volt = 1.e-6 * megavolt
214 
215 #
216 # Electric resistance [E][T][Q^-2]
217 #
218 # ohm = 1.60217e-16*(MeV/eplus)/(eplus/ns)
219 ohm = volt / ampere
220 
221 #
222 # Electric capacitance [Q^2][E^-1]
223 #
224 # farad = 6.24150e+24 * eplus/Megavolt
225 farad = coulomb / volt
226 millifarad = 1.e-3 * farad
227 microfarad = 1.e-6 * farad
228 nanofarad = 1.e-9 * farad
229 picofarad = 1.e-12 * farad
230 
231 #
232 # Magnetic Flux [T][E][Q^-1]
233 #
234 weber = volt * second # weber = 1000*megavolt*ns
235 
236 #
237 # Magnetic Field [T][E][Q^-1][L^-2]
238 #
239 tesla = volt * second / meter2 # tesla =0.001*megavolt*ns/mm2
240 
241 gauss = 1.e-4 * tesla
242 kilogauss = 1.e-1 * tesla
243 
244 #
245 # Inductance [T^2][E][Q^-2]
246 #
247 # henry = 1.60217e-7*MeV*(ns/eplus)**2
248 henry = weber / ampere
249 
250 #
251 # Temperature
252 #
253 kelvin = 1.
254 
255 #
256 # Amount of substance
257 #
258 mole = 1.
259 
260 #
261 # Activity [T^-1]
262 #
263 becquerel = 1. / second
264 curie = 3.7e+10 * becquerel
265 
266 #
267 # Absorbed dose [L^2][T^-2]
268 #
269 gray = joule / kilogram
270 
271 #
272 # Luminous intensity [I]
273 #
274 candela = 1.
275 
276 #
277 # Luminous flux [I]
278 #
279 lumen = candela * steradian
280 
281 #
282 # Illuminance [I][L^-2]
283 #
284 lux = lumen / meter2
285 
286 #
287 # Miscellaneous
288 #
289 perCent = 0.01
290 perThousand = 0.001
291 perMillion = 0.000001