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Tune SPT landmark z for surface-like station-centric depth #116

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Merged
drparamita merged 2 commits into from
Apr 15, 2026
Merged

Tune SPT landmark z for surface-like station-centric depth #116

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Tune SPT landmark z for surface-like station-centric depth
Apr 2, 2026
49ee8e2
writting depth SPT in terms of fFtInm
Apr 2, 2026
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14 changes: 13 additions & 1 deletion AraEvent/AraGeomTool.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -44,7 +44,19 @@ const Double_t fAU=149597890000; //(in meters)
// Some locations in ARA global coordinates
Double_t fSouthPole2010_11[3]={27344.05*fFtInm,-3395.14*fFtInm,-35.63*fFtInm};
Double_t fSouthPole2011_12[3]={27322.88*fFtInm,-3369.89*fFtInm,-36.02*fFtInm};
Double_t fSouthPoleTelescope[3]={24774.18*fFtInm,-871.35*fFtInm,-30*fFtInm}; ///< Made up the u-number

// Paramita Dasgupta (PDG): SouthPoleTelescope (SPT) is a surface landmark (array z≈0), but after converting from ARA global
// (array) coordinates to station-centric coordinates, the station rotation can mix x/y into z. As a result,
// different surface landmarks can end up with slightly different station-centric z values.
// We therefore apply a small +array-z offset for SPT so that its station-centric z is small and positive,
// comparable to ICL
// Date: 1 April 2026.
// If you know the true SPT depth in ARA global coordinates, please replace the value
// below and add a reference.

Double_t fSouthPoleTelescope[3]={24774.18*fFtInm,-871.35*fFtInm,1.000656*fFtInm}; // z in meters (tuned offset)


Double_t fICL2011_12[4][3]={{24011.58*fFtInm,-1702.53*fFtInm,0},
{24060.51*fFtInm,-1723.09*fFtInm,0},
{24049.7*fFtInm,-1749.02*fFtInm,0},
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