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File indexing completed on 2025-01-18 09:55:33
0001 // SPDX-License-Identifier: LGPL-3.0-or-later 0002 // Copyright (C) 2023 Dmitry Kalinkin 0003 0004 #pragma once 0005 0006 namespace edm4eic { 0007 0008 namespace unit { 0009 0010 // 0011 // This provides definition for a unique unit system for this EDM. It is 0012 // neither Geant, nor TGeo. The DD4hep, by default, uses a system matching 0013 // the TGeo one. 0014 // 0015 // +------------+---------------------|-----------------+ 0016 // | Geant | TGeo | EDM4hep/EDM4eic | 0017 // +------------+---------------------|-----------------+ 0018 // | milimeter | centimeter | milimeter | 0019 // | nanosecond | second | nanosecond | 0020 // | MeV | GeV | GeV | 0021 // +------------+---------------------|-----------------+ 0022 // 0023 0024 // distance 0025 static constexpr double mm = 1.0; // millimeter 0026 static constexpr double cm = 1e1 * mm; // centimeter 0027 static constexpr double um = 1e-3 * mm; // micrometer 0028 static constexpr double nm = 1e-6 * mm; // nanometer 0029 static constexpr double m = 1e3 * mm; // meter 0030 0031 // time 0032 static constexpr double ns = 1.0; // nanosecond 0033 static constexpr double s = 1e9 * ns; // second 0034 static constexpr double ms = 1e6 * ns; // milisecond 0035 static constexpr double us = 1e3 * ns; // microsecond 0036 static constexpr double ps = 1e-3 * ns; // picosecond 0037 0038 // energy 0039 static constexpr double GeV = 1.0; // giga electron volt 0040 static constexpr double MeV = 1e-3 * GeV; // mega electron volt 0041 static constexpr double keV = 1e-6 * GeV; // kilo electron volt 0042 static constexpr double eV = 1e-9 * GeV; // electron volt 0043 0044 } 0045 0046 }
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