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examples/LaserWakefield/include/simulation_defines/param/physicalConstants.param
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| /** | ||
| * Copyright 2013 Axel Huebl, Heiko Burau, Rene Widera | ||
| * | ||
| * This file is part of PIConGPU. | ||
| * | ||
| * PIConGPU is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * PIConGPU is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with PIConGPU. | ||
| * If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
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| #pragma once | ||
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| namespace picongpu | ||
| { | ||
| const float_64 PI = 3.141592653589793238462643383279502884197169399; | ||
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| /** Threshold used for calculations that want to separate between | ||
| * high-precision formulas for relativistic and non-relativistic | ||
| * use-cases, e.g. energy-binning algorithms. */ | ||
| const float_X GAMMA_THRESH = float_X(1.005); | ||
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| namespace SI | ||
| { | ||
| /** unit: m / s */ | ||
| const float_64 SPEED_OF_LIGHT_SI = 2.99792458e8; | ||
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| /** unit: N / A^2 */ | ||
| const float_64 MUE0_SI = PI * 4.e-7; | ||
| /** unit: C / (V m) */ | ||
| const float_64 EPS0_SI = 1.0 / MUE0_SI / SPEED_OF_LIGHT_SI | ||
| / SPEED_OF_LIGHT_SI; | ||
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| // Electron properties | ||
| /** unit: kg */ | ||
| const float_64 ELECTRON_MASS_SI = 9.109382e-31; | ||
| /** unit: C */ | ||
| const float_64 ELECTRON_CHARGE_SI = -1.602176e-19; | ||
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| // Ion / Proton / Positron properties | ||
| /** unit: kg */ | ||
| const float_64 ION_MASS_SI = 1.6726217e-27; | ||
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| const float_64 ION_MASS_C_SI = 1.660538921-27; | ||
| } | ||
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| // converts | ||
| // | ||
| // UNIT_A to UNIT_B | ||
| // | ||
| // CONVENTION: WE DO NOT CONVERT FROM ANY STRANGE UNIT TO UNITLESS UNITS DIRECTLY! | ||
| // convert steps: INPUT -> float_64_convert to SI -> float_64_convert to unitless | ||
| // -> cast to float | ||
| // WE DO NOT define "UNIT_ENERGY_keV" or something similar! Never! | ||
| // Stay SI, stay free ;-) | ||
| // | ||
| // example: | ||
| // // some particle physicist beloved input: | ||
| // const float_64 An_Arbitrary_Energy_Input_keV = 30.0; // unit: keV | ||
| // | ||
| // // first convert to SI (because SI stays our standard Unit System!) | ||
| // const float_64 An_Arbitrary_Energy_Input_SI = An_Arbitrary_Energy_Input_keV * UNITCONV_keV_to_Joule // unit: Joule | ||
| // | ||
| // // now the "real" convert to our internal unitless system | ||
| // const float_X An_Arbitrary_Energy_Input = float_X(An_Arbitrary_Energy_Input_SI / UNIT_ENERGY) // unit: none | ||
| // | ||
| // As a convention, we DO NOT use the short track: | ||
| // const float_64 An_Arbitrary_Energy_Input_keV = 30.0; // unit: keV | ||
| // const float_X An_Arbitrary_Energy_Input = float_X(An_Arbitrary_Energy_Input_SI * UNITCONV_keV_to_Joule / UNIT_ENERGY) // unit: none | ||
| // | ||
| const float_64 UNITCONV_keV_to_Joule = 1.60217646e-16; | ||
| const float_64 UNITCONV_Joule_to_keV = (1.0 / UNITCONV_keV_to_Joule); | ||
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| } |
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