Qw Namespace Reference

Enumerations
enum	EQwColor {   kBlack , kRed , kGreen , kBrown ,   kBlue , kMagenta , kCyan , kWhite ,   kDefaultForeground , kBold , kBoldRed , kBoldGreen ,   kBoldBrown , kBoldBlue , kBoldMagenta , kBoldCyan ,   kBoldWhite , kBackRed , kBackGreen , kBackBlue ,   kDefaultBackground , kNormal }

Variables
static const double	mm = 1.0
	Length units: base unit is mm.
static const double	um = 1.0e-3 * mm
static const double	cm = 1.0e1 * mm
static const double	m = 1.0e2 * cm
static const double	km = 1.0e3 * m
static const double	in = 2.54 * cm
static const double	mil = 0.001 * in
static const double	ms = 1.0
	Time units: base unit is ms.
static const double	us = 1.0e-3 * ms
static const double	ns = 1.0e-6 * ms
static const double	sec = 1.0e3 * ms
static const double	min = 60.0 * sec
static const double	hour = 60.0 * min
static const double	day = 24.0 * hour
static const double	Hz = 1.0 / sec
	Frequency units: base unit is kHz.
static const double	kHz = 1.0 / ms
static const double	MHz = 1.0e3 * kHz
static const double	V = 1.0
	Energy: base unit is MeV.
static const double	e = 1.0e-6
static const double	eV = 1.0e-6
static const double	keV = 1.0e-3
static const double	MeV = 1.0
static const double	GeV = 1.0e3
static const double	MeV2 = MeV * MeV
static const double	GeV2 = GeV * GeV
static const double	pi = 3.14159265
	Angles: base unit is radian.
static const double	deg2rad = pi / 180.0
static const double	rad2deg = 180.0 / pi
static const double	rad = 1.0
static const double	deg = deg2rad
static const double	T = V * sec / (m * m)
	Magnetic field: base unit is T.
static const double	G = 1.0e-4 * T
static const double	kG = 1.0e3 * G
static const double	uA = 1.0
	Beam current: base unit is microamp.
static const double	V_uA = V/uA
	Signal levels: base unit is volt, and is already defined above.
static const double	mV_uA = 1.0e-3 * V_uA
	Signal volts per microamp.
static const double	c = 299792458. * m / sec
	Physical constants.
static const double	Mp = 938.272013 * MeV
	Mass of the proton.
static const double	ppm =1e-6
static const double	ppb =1e-9

Detailed Description

Units in the QwAnalysis framework

As more and more analyzers start contributing code to the Qweak analysis code, it is important to use some conventions to avoid confusion. One of the conventions is the use of a standard system of coordinates. The other is a unified set of units. This way we will avoid errors when angles are not converted from degrees to radians, or centimeters and inches are in mixed up.

The basic units in the QwAnalysis framework are:

• Length: cm
• Time: ms
• Energy: MeV
• Angles: rad
• Magnetic field: T

How are these units to be used? Any variable that is being used inside subsystems and especially when passing information to other subsystems should have values in these units.

This does not mean that every single constant has to be defined in these units, or that output has to use these units. A set of conversion constants is defined to make life easier.

Take as an example the magnetic field map. The values stored in the map file by the external program are in kG. To convert those values, we would write:

double bx, by, bz;
mapfile >> bx >> by >> bz; // read values
bx *= Qw::kG; by *= Qw::kG; bz *= Qw::kG; // define the units (kG)

From now on, the values in bx, by, bz are in standard Qweak units (T). To write out the values in Gauss we write:

cout << bx/Qw::G << "," << by/Qw::G << "," << bz/Qw::G << " G" << endl;

For Tesla we would write

cout << bx/Qw::T << "," << by/Qw::T << "," << bz/Qw::T << " T" << endl;

If there are hard-coded values in the analyzer (which should be avoided), we should use these units to define them:

const double position_r3 = 398.8 * Qw::cm;
const double helicity_window = 1.0 * Qw::ms;
const double noise_frequency = 60.0 * Qw::Hz;

Enumeration Type Documentation

EQwColor

enum Qw::EQwColor

Enumerator
kBlack
kRed
kGreen
kBrown
kBlue
kMagenta
kCyan
kWhite
kDefaultForeground
kBold
kBoldRed
kBoldGreen
kBoldBrown
kBoldBlue
kBoldMagenta
kBoldCyan
kBoldWhite
kBackRed
kBackGreen
kBackBlue
kDefaultBackground
kNormal

Definition at line 76 of file QwColor.h.

                {
    kBlack, kRed, kGreen, kBrown, kBlue, kMagenta, kCyan, kWhite, kDefaultForeground,
    kBold,
    kBoldRed, kBoldGreen, kBoldBrown, kBoldBlue, kBoldMagenta, kBoldCyan, kBoldWhite,
    kBackRed, kBackGreen, kBackBlue, kDefaultBackground,
    kNormal
  };

Variable Documentation

c

const double Qw::c = 299792458. * m / sec

static

Physical constants.

Speed of light

Definition at line 134 of file QwUnits.h.

cm

const double Qw::cm = 1.0e1 * mm

static

Definition at line 67 of file QwUnits.h.

day

const double Qw::day = 24.0 * hour

static

Definition at line 83 of file QwUnits.h.

deg

const double Qw::deg = deg2rad

static

Definition at line 111 of file QwUnits.h.

deg2rad

const double Qw::deg2rad = pi / 180.0

static

Definition at line 108 of file QwUnits.h.

e

const double Qw::e = 1.0e-6

static

Definition at line 96 of file QwUnits.h.

eV

const double Qw::eV = 1.0e-6

static

Definition at line 97 of file QwUnits.h.

G

const double Qw::G = 1.0e-4 * T

static

Definition at line 117 of file QwUnits.h.

GeV

const double Qw::GeV = 1.0e3

static

Definition at line 100 of file QwUnits.h.

GeV2

const double Qw::GeV2 = GeV * GeV

static

Definition at line 102 of file QwUnits.h.

hour

const double Qw::hour = 60.0 * min

static

Definition at line 82 of file QwUnits.h.

Hz

const double Qw::Hz = 1.0 / sec

static

Frequency units: base unit is kHz.

Definition at line 88 of file QwUnits.h.

Referenced by MQwMockable::LoadMockDataParameters().

in

const double Qw::in = 2.54 * cm

static

Definition at line 71 of file QwUnits.h.

keV

const double Qw::keV = 1.0e-3

static

Definition at line 98 of file QwUnits.h.

kG

const double Qw::kG = 1.0e3 * G

static

Definition at line 118 of file QwUnits.h.

kHz

const double Qw::kHz = 1.0 / ms

static

Definition at line 89 of file QwUnits.h.

km

const double Qw::km = 1.0e3 * m

static

Definition at line 69 of file QwUnits.h.

m

const double Qw::m = 1.0e2 * cm

static

Definition at line 68 of file QwUnits.h.

MeV

const double Qw::MeV = 1.0

static

Definition at line 99 of file QwUnits.h.

MeV2

const double Qw::MeV2 = MeV * MeV

static

Definition at line 101 of file QwUnits.h.

MHz

const double Qw::MHz = 1.0e3 * kHz

static

Definition at line 90 of file QwUnits.h.

mil

const double Qw::mil = 0.001 * in

static

Definition at line 72 of file QwUnits.h.

min

const double Qw::min = 60.0 * sec

static

Definition at line 81 of file QwUnits.h.

mm

const double Qw::mm = 1.0

static

Length units: base unit is mm.

Definition at line 65 of file QwUnits.h.

Referenced by PromptSummaryElement::Set().

Mp

const double Qw::Mp = 938.272013 * MeV

static

Mass of the proton.

Definition at line 135 of file QwUnits.h.

ms

const double Qw::ms = 1.0

static

Time units: base unit is ms.

Definition at line 77 of file QwUnits.h.

Referenced by QwSubsystemArrayParity::LoadMockDataParameters().

mV_uA

const double Qw::mV_uA = 1.0e-3 * V_uA

static

Signal volts per microamp.

Definition at line 129 of file QwUnits.h.

Referenced by PromptSummaryElement::Set().

ns

const double Qw::ns = 1.0e-6 * ms

static

Definition at line 79 of file QwUnits.h.

pi

const double Qw::pi = 3.14159265

static

Angles: base unit is radian.

Definition at line 107 of file QwUnits.h.

Referenced by QwADC18_Channel::RandomizeEventData(), QwMollerADC_Channel::RandomizeEventData(), QwVQWK_Channel::RandomizeEventData(), and VQwScaler_Channel::RandomizeEventData().

ppb

const double Qw::ppb =1e-9

static

Definition at line 141 of file QwUnits.h.

ppm

const double Qw::ppm =1e-6

static

Definition at line 140 of file QwUnits.h.

Referenced by PromptSummaryElement::Set().

rad

const double Qw::rad = 1.0

static

Definition at line 110 of file QwUnits.h.

rad2deg

const double Qw::rad2deg = 180.0 / pi

static

Definition at line 109 of file QwUnits.h.

sec

const double Qw::sec = 1.0e3 * ms

static

Definition at line 80 of file QwUnits.h.

Referenced by QwCombinedBCM< T >::LoadMockDataParameters(), QwSubsystemArrayParity::LoadMockDataParameters(), and QwIntegrationPMT::RandomizeMollerEvent().

T

const double Qw::T = V * sec / (m * m)

static

Magnetic field: base unit is T.

Definition at line 116 of file QwUnits.h.

uA

const double Qw::uA = 1.0

static

Beam current: base unit is microamp.

Definition at line 123 of file QwUnits.h.

Referenced by PromptSummaryElement::Set().

um

const double Qw::um = 1.0e-3 * mm

static

Definition at line 66 of file QwUnits.h.

Referenced by PromptSummaryElement::Set().

us

const double Qw::us = 1.0e-3 * ms

static

Definition at line 78 of file QwUnits.h.

V

const double Qw::V = 1.0

static

Energy: base unit is MeV.

Definition at line 95 of file QwUnits.h.

V_uA

const double Qw::V_uA = V/uA

static

Signal levels: base unit is volt, and is already defined above.

Signal volts per microamp

Definition at line 128 of file QwUnits.h.