KM3NET Namespace Reference

Functions
const JK40Rates &	getK40Rates ()
	Get K40 rates. More...
double	getAmbientPressure ()
	Get ambient pressure. More...
double	getPhotocathodeArea ()
	Get photo-cathode area of PMT. More...
double	getAbsorptionLength (const double lambda)
	Get absorption length. More...
double	getScatteringLength (const double lambda)
	Get scattering length. More...
double	getScatteringProbability (const double x)
	Function to describe light scattering in water. More...
double	getAngularAcceptance (const double x)
	Get angular acceptance of PMT. More...
double	getQE (const double lambda)
	Get quantum efficiency of KM3NeT PMT. More...
double	getPhotocathodeArea2D (const double x, const double lambda)
	Get effective photo-cathode area of PMT. More...
void	setClock ()
	Set clock. More...

Function Documentation

const JK40Rates& KM3NET::getK40Rates ( )

inline

Get K40 rates.

This method returns an object with default values.
The singles and multiples rates are based on Analysis e-log entry 575.
A dark count of 700 Hz has been included in the singles rate.
See also KM3NeT internal note.

Returns

K40 rates [Hz]

Definition at line 36 of file KM3NeT.hh.

  {
    static const JK40Rates rates_Hz(5200, {  568.0,  49.10,   5.48,   0.48});

    return rates_Hz;
  }

double KM3NET::getAmbientPressure ( )

inline

Get ambient pressure.

Returns

pressure [Atm]

Definition at line 49 of file KM3NeT.hh.

  {
    return 240.0;    // ambient pressure [Atm]
  }

double KM3NET::getPhotocathodeArea ( )

inline

Get photo-cathode area of PMT.

Returns

photo-cathode area [m^2]

Definition at line 60 of file KM3NeT.hh.

  {
    return 45.4e-4;  // photo-cathode area [m^2]
  }

double KM3NET::getAbsorptionLength ( const double  lambda )

inline

Get absorption length.

Parameters

lambda

wavelength of light [nm]

Returns

absorption length [m]

Definition at line 72 of file KM3NeT.hh.

  {
    static JPolint1Function1D_t f1;

    if (f1.empty()) {

      f1[290] =   0.0;
      f1[310] =  11.9;
      f1[330] =  16.4;
      f1[350] =  20.6;
      f1[375] =  29.5;
      f1[412] =  48.5;
      f1[440] =  67.5;
      f1[475] =  59.0;
      f1[488] =  55.1;
      f1[510] =  26.1;
      f1[532] =  19.9;
      f1[555] =  14.7;
      f1[650] =   2.8;
      f1[676] =   2.3;
      f1[715] =   1.0;
      f1[720] =   0.0;

      f1.compile();

      f1.setExceptionHandler(new JPolint1Function1D_t::JDefaultResult(0.0));
    }

    return f1(lambda);
  }

double KM3NET::getScatteringLength ( const double  lambda )

inline

Get scattering length.

Use the Kopelevich model for spectral volume scattering functions.
The model separates the contributions by:

• pure_sea: pure sea water;
• small_par: 'small' particles (size < 1 micro meter);
• large_par: 'large' particles (size > 1 micro meter). Values are taken from reference C.D. Mobley "Light and Water", ISBN 0-12-502750-8, pag. 119.

Parameters

lambda

wavelength of light [nm]

Returns

scattering length [m]

Definition at line 118 of file KM3NeT.hh.

  {
    static const double Vs = 0.0075;
    static const double Vl = 0.0075;
    static const double bw = 0.0017;
    static const double bs = 1.340;
    static const double bl = 0.312;

    const double x = 550.0/lambda;

    const double pure_sea  = bw *      pow(x, 4.3);
    const double small_par = bs * Vs * pow(x, 1.7);
    const double large_par = bl * Vl * pow(x, 0.3);

    return 1.0 / (pure_sea + small_par + large_par);
  }

double KM3NET::getScatteringProbability ( const double  x )

inline

Function to describe light scattering in water.

Parameters

x	cosine scattering angle

Returns

probability

Definition at line 142 of file KM3NeT.hh.

  {
    return JPHYSICS::p00075(x);
  }

double KM3NET::getAngularAcceptance ( const double  x )

inline

Get angular acceptance of PMT.

Parameters

x	cosine of angle of incidence

Returns

probability

Definition at line 154 of file KM3NeT.hh.

  {
    static JGridPolint1Function1D_t f1;

    if (f1.empty()) {

      f1[-1.00] = 1.621;
      f1[-0.95] = 1.346;
      f1[-0.90] = 1.193;
      f1[-0.85] = 1.073;
      f1[-0.80] = 0.973;
      f1[-0.75] = 0.877;
      f1[-0.70] = 0.790;
      f1[-0.65] = 0.711;
      f1[-0.60] = 0.640;
      f1[-0.55] = 0.575;
      f1[-0.50] = 0.517;
      f1[-0.45] = 0.450;
      f1[-0.40] = 0.396;
      f1[-0.35] = 0.341;
      f1[-0.30] = 0.295;
      f1[-0.25] = 0.249;
      f1[-0.20] = 0.207;
      f1[-0.15] = 0.166;
      f1[-0.10] = 0.128;
      f1[-0.05] = 0.095;
      f1[0.00] = 0.065;
      f1[0.05] = 0.038;
      f1[0.10] = 0.017;
      f1[0.15] = 0.006;
      f1[0.20] = 0.003;
      f1[0.25] = 0.002;
      f1[0.30] = 0.001;
      f1[0.35] = 0.001;
      f1[0.40] = 0.001;

      f1.compile();

      f1.setExceptionHandler(new JGridPolint1Function1D_t::JDefaultResult(0.0));
    }

    return f1(x);
  }

double KM3NET::getQE ( const double  lambda )

inline

Get quantum efficiency of KM3NeT PMT.

Note that the QE includes absorption in glass and gel.

Parameters

lambda

wavelength of photon [nm]

Returns

quantum efficiency

Definition at line 207 of file KM3NeT.hh.

  {
    static JGridPolint1Function1D_t f1;
    static const double cola    = 0.9;      // collection efficiency

    if (f1.empty()) {

      f1[270] = 0.0;
      f1[275] = 0.0;
      f1[280] = 0.0;
      f1[285] = 0.0;
      f1[290] = 0.0;
      f1[295] = 0.1;
      f1[300] = 0.1;
      f1[305] = 0.9;
      f1[310] = 1.8;
      f1[315] = 4.6;
      f1[320] = 7.4;
      f1[325] = 11.3;
      f1[330] = 15.2;
      f1[335] = 18.1;
      f1[340] = 21.0;
      f1[345] = 22.4;
      f1[350] = 23.7;
      f1[355] = 24.5;
      f1[360] = 25.3;
      f1[365] = 25.8;
      f1[370] = 26.3;
      f1[375] = 26.2;
      f1[380] = 26.0;
      f1[385] = 26.6;
      f1[390] = 27.1;
      f1[395] = 26.9;
      f1[400] = 26.8;
      f1[405] = 26.5;
      f1[410] = 26.3;
      f1[415] = 26.0;
      f1[420] = 25.7;
      f1[425] = 25.6;
      f1[430] = 25.4;
      f1[435] = 25.1;
      f1[440] = 24.9;
      f1[445] = 24.5;
      f1[450] = 24.1;
      f1[455] = 23.5;
      f1[460] = 22.9;
      f1[465] = 22.1;
      f1[470] = 21.3;
      f1[475] = 20.6;
      f1[480] = 19.9;
      f1[485] = 19.5;
      f1[490] = 19.1;
      f1[495] = 18.8;
      f1[500] = 18.5;
      f1[505] = 18.1;
      f1[510] = 17.7;
      f1[515] = 16.8;
      f1[520] = 15.9;
      f1[525] = 14.3;
      f1[530] = 12.7;
      f1[535] = 11.5;
      f1[540] = 10.2;
      f1[545] = 9.5;
      f1[550] = 8.7;
      f1[555] = 8.1;
      f1[560] = 7.6;
      f1[565] = 7.2;
      f1[570] = 6.8;
      f1[575] = 6.4;
      f1[580] = 6.0;
      f1[585] = 5.6;
      f1[590] = 5.1;
      f1[595] = 4.8;
      f1[600] = 4.4;
      f1[605] = 4.0;
      f1[610] = 3.6;
      f1[615] = 3.3;
      f1[620] = 3.0;
      f1[625] = 2.7;
      f1[630] = 2.3;
      f1[635] = 2.1;
      f1[640] = 1.9;
      f1[645] = 1.7;
      f1[650] = 1.5;
      f1[655] = 1.4;
      f1[660] = 1.2;
      f1[665] = 1.0;
      f1[670] = 0.9;
      f1[675] = 0.7;
      f1[680] = 0.6;
      f1[685] = 0.5;
      f1[690] = 0.4;
      f1[695] = 0.3;
      f1[700] = 0.2;
      f1[705] = 0.1;
      f1[710] = 0.0;

      f1.compile();

      f1.setExceptionHandler(new JGridPolint1Function1D_t::JDefaultResult(0.0));
    }

    return f1(lambda) * 0.01 * cola;
  }

double KM3NET::getPhotocathodeArea2D ( const double  x, const double  lambda  )

inline

Get effective photo-cathode area of PMT.

Parameters

x	cosine of angle of incidence
lambda	wavelength of photon [nm]

Returns

photo-cathode area [m^2]

Definition at line 320 of file KM3NeT.hh.

  {
    return getPhotocathodeArea() * getQE(lambda) * getAngularAcceptance(x);
  }

void KM3NET::setClock ( )

inline

Set clock.

Definition at line 314 of file JDAQClock.hh.

  {
    KM3NETDAQ::JDAQClock clock(KM3NETDAQ::JDAQClock::KM3NET);
  }