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add utils/include/edm4eic/unit_system.h #35

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merged 6 commits into from
Jul 31, 2023
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add utils/include/edm4eic/unit_system.h #35

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6a6872c
add utils/include/edm4eic/unit_system.h
veprbl May 3, 2023
f2caeac
cmake: install unit_system.h
veprbl May 3, 2023
ade0c87
unit_system.h: fix distance units
veprbl May 3, 2023
7224fdf
unit_system.h: fix comments
veprbl May 3, 2023
9420da9
add missing required type
veprbl May 16, 2023
728ca2a
unit_system.h: use short unit notation with micro -> u
veprbl May 17, 2023
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1 change: 1 addition & 0 deletions utils/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@ target_include_directories(edm4eic_utils

install(FILES
include/edm4eic/analysis_utils.h
include/edm4eic/unit_system.h
include/edm4eic/vector_utils.h
include/edm4eic/vector_utils_legacy.h
DESTINATION include/edm4eic
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46 changes: 46 additions & 0 deletions utils/include/edm4eic/unit_system.h
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@@ -0,0 +1,46 @@
// SPDX-License-Identifier: LGPL-3.0-or-later
// Copyright (C) 2023 Dmitry Kalinkin

#pragma once

namespace edm4eic {

namespace unit {

//
// This provides definition for a unique unit system for this EDM. It is
// neither Geant, nor TGeo. The DD4hep, by default, uses a system matching
// the TGeo one.
//
// +------------+---------------------|-----------------+
// | Geant | TGeo | EDM4hep/EDM4eic |
// +------------+---------------------|-----------------+
// | milimeter | centimeter | milimeter |
// | nanosecond | second | nanosecond |
// | MeV | GeV | GeV |
// +------------+---------------------|-----------------+
//

// distance
static constexpr double mm = 1.0; // millimeter
static constexpr double cm = 1e1 * mm; // centimeter
static constexpr double um = 1e-3 * mm; // micrometer
static constexpr double nm = 1e-6 * mm; // nanometer
static constexpr double m = 1e3 * mm; // meter

// time
static constexpr double ns = 1.0; // nanosecond
static constexpr double s = 1e9 * ns; // second
static constexpr double ms = 1e6 * ns; // milisecond
static constexpr double us = 1e3 * ns; // microsecond
static constexpr double ps = 1e-3 * ns; // picosecond

// energy
static constexpr double GeV = 1.0; // giga electron volt
static constexpr double MeV = 1e-3 * GeV; // mega electron volt
static constexpr double keV = 1e-6 * GeV; // kilo electron volt
static constexpr double eV = 1e-9 * GeV; // electron volt

}

}