Gabriele Cosmo
309 lines
6.1 KiB
Python
309 lines
6.1 KiB
Python
"""
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# ==================================================================
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# Python module
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#
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# This module defines physical units and constants used in HEP,
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# which are imported from CLHEP library.
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#
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# Q, 2005
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# ==================================================================
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"""
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#$Id: hepunit.py 66892 2013-01-17 10:57:59Z gunter $
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# ==================================================================
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# imported from "SystemOfUnits.h"
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# ==================================================================
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millimeter = 1.
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millimeter2 = millimeter*millimeter
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millimeter3 = millimeter*millimeter*millimeter
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centimeter = 10.*millimeter
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centimeter2 = centimeter*centimeter
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centimeter3 = centimeter*centimeter*centimeter
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meter = 1000.*millimeter
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meter2 = meter*meter
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meter3 = meter*meter*meter
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kilometer = 1000.*meter
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kilometer2 = kilometer*kilometer
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kilometer3 = kilometer*kilometer*kilometer
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parsec = 3.0856775807e+16*meter
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micrometer = 1.e-6 *meter
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nanometer = 1.e-9 *meter
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angstrom = 1.e-10*meter
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fermi = 1.e-15*meter
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barn = 1.e-28*meter2
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millibarn = 1.e-3 *barn
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microbarn = 1.e-6 *barn
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nanobarn = 1.e-9 *barn
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picobarn = 1.e-12*barn
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# symbols
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mm = millimeter
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mm2 = millimeter2
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mm3 = millimeter3
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cm = centimeter
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cm2 = centimeter2
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cm3 = centimeter3
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m = meter
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m2 = meter2
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m3 = meter3
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km = kilometer
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km2 = kilometer2
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km3 = kilometer3
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pc = parsec
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#
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# Angle
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#
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radian = 1.
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milliradian = 1.e-3*radian
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degree = (3.14159265358979323846/180.0)*radian
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steradian = 1.
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# symbols
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rad = radian
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mrad = milliradian
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sr = steradian
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deg = degree
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#
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# Time [T]
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#
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nanosecond = 1.
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second = 1.e+9 *nanosecond
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millisecond = 1.e-3 *second
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microsecond = 1.e-6 *second
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picosecond = 1.e-12*second
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hertz = 1./second
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kilohertz = 1.e+3*hertz
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megahertz = 1.e+6*hertz
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# symbols
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ns = nanosecond
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s = second
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ms = millisecond
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#
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# Electric charge [Q]
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#
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eplus = 1. # positron charge
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e_SI = 1.60217733e-19 # positron charge in coulomb
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coulomb = eplus/e_SI # coulomb = 6.24150 e+18 * eplus
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#
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# Energy [E]
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#
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megaelectronvolt = 1.
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electronvolt = 1.e-6*megaelectronvolt
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kiloelectronvolt = 1.e-3*megaelectronvolt
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gigaelectronvolt = 1.e+3*megaelectronvolt
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teraelectronvolt = 1.e+6*megaelectronvolt
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petaelectronvolt = 1.e+9*megaelectronvolt
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joule = electronvolt/e_SI # joule = 6.24150 e+12 * MeV
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# symbols
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MeV = megaelectronvolt
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eV = electronvolt
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keV = kiloelectronvolt
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GeV = gigaelectronvolt
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TeV = teraelectronvolt
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PeV = petaelectronvolt
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#
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# Mass [E][T^2][L^-2]
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#
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kilogram = joule*second*second/(meter*meter)
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gram = 1.e-3*kilogram
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milligram = 1.e-3*gram
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# symbols
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kg = kilogram
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g = gram
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mg = milligram
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#
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# Power [E][T^-1]
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#
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watt = joule/second # watt = 6.24150 e+3 * MeV/ns
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#
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# Force [E][L^-1]
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#
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newton = joule/meter # newton = 6.24150 e+9 * MeV/mm
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#
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# Pressure [E][L^-3]
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#
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pascal = newton/m2 # pascal = 6.24150 e+3 * MeV/mm3
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bar = 100000*pascal # bar = 6.24150 e+8 * MeV/mm3
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atmosphere = 101325*pascal # atm = 6.32420 e+8 * MeV/mm3
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#
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# Electric current [Q][T^-1]
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#
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ampere = coulomb/second # ampere = 6.24150 e+9 * eplus/ns
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milliampere = 1.e-3*ampere
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microampere = 1.e-6*ampere
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nanoampere = 1.e-9*ampere
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#
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# Electric potential [E][Q^-1]
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#
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megavolt = megaelectronvolt/eplus
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kilovolt = 1.e-3*megavolt
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volt = 1.e-6*megavolt
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#
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# Electric resistance [E][T][Q^-2]
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#
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ohm = volt/ampere # ohm = 1.60217e-16*(MeV/eplus)/(eplus/ns)
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#
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# Electric capacitance [Q^2][E^-1]
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#
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farad = coulomb/volt # farad = 6.24150e+24 * eplus/Megavolt
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millifarad = 1.e-3*farad
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microfarad = 1.e-6*farad
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nanofarad = 1.e-9*farad
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picofarad = 1.e-12*farad
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#
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# Magnetic Flux [T][E][Q^-1]
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#
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weber = volt*second # weber = 1000*megavolt*ns
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#
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# Magnetic Field [T][E][Q^-1][L^-2]
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#
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tesla = volt*second/meter2 # tesla =0.001*megavolt*ns/mm2
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gauss = 1.e-4*tesla
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kilogauss = 1.e-1*tesla
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#
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# Inductance [T^2][E][Q^-2]
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#
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henry = weber/ampere # henry = 1.60217e-7*MeV*(ns/eplus)**2
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#
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# Temperature
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#
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kelvin = 1.
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#
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# Amount of substance
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#
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mole = 1.
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#
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# Activity [T^-1]
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#
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becquerel = 1./second
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curie = 3.7e+10 * becquerel
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#
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# Absorbed dose [L^2][T^-2]
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#
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gray = joule/kilogram
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#
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# Luminous intensity [I]
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#
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candela = 1.
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#
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# Luminous flux [I]
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#
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lumen = candela*steradian
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#
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# Illuminance [I][L^-2]
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#
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lux = lumen/meter2
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#
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# Miscellaneous
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#
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perCent = 0.01
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perThousand = 0.001
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perMillion = 0.000001
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# ==================================================================
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# imported from "PhysicalConstants.h"
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# ==================================================================
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pi = 3.14159265358979323846
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twopi = 2.*pi
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halfpi = pi/2.
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pi2 = pi*pi
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#
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Avogadro = 6.0221367e+23/mole
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# c = 299.792458 mm/ns
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# c^2 = 898.7404 (mm/ns)^2
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c_light = 2.99792458e+8 * m/s
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c_squared = c_light * c_light
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# h = 4.13566e-12 MeV*ns
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# hbar = 6.58212e-13 MeV*ns
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# hbarc = 197.32705e-12 MeV*mm
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h_Planck = 6.6260755e-34 * joule*s
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hbar_Planck = h_Planck/twopi
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hbarc = hbar_Planck * c_light
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hbarc_squared = hbarc * hbarc
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#
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electron_charge = - eplus # see SystemOfUnits.h
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e_squared = eplus * eplus
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# amu_c2 - atomic equivalent mass unit
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# amu - atomic mass unit
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electron_mass_c2 = 0.51099906 * MeV
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proton_mass_c2 = 938.27231 * MeV
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neutron_mass_c2 = 939.56563 * MeV
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amu_c2 = 931.49432 * MeV
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amu = amu_c2/c_squared
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# permeability of free space mu0 = 2.01334e-16 Mev*(ns*eplus)^2/mm
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# permittivity of free space epsil0 = 5.52636e+10 eplus^2/(MeV*mm)
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mu0 = 4*pi*1.e-7 * henry/m
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epsilon0 = 1./(c_squared*mu0)
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# electromagnetic coupling = 1.43996e-12 MeV*mm/(eplus^2)
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elm_coupling = e_squared/(4*pi*epsilon0)
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fine_structure_const = elm_coupling/hbarc
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classic_electr_radius = elm_coupling/electron_mass_c2
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electron_Compton_length = hbarc/electron_mass_c2
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Bohr_radius = electron_Compton_length/fine_structure_const
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alpha_rcl2 = fine_structure_const * classic_electr_radius \
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* classic_electr_radius
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twopi_mc2_rcl2 = twopi * electron_mass_c2 \
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* classic_electr_radius \
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* classic_electr_radius
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#
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k_Boltzmann = 8.617385e-11 * MeV/kelvin
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#
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STP_Temperature = 273.15*kelvin
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STP_Pressure = 1.*atmosphere
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kGasThreshold = 10.*mg/cm3
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#
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universe_mean_density = 1.e-25*g/cm3
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