From 88bbff483bbf496e6f09e06c7435fea9cd037903 Mon Sep 17 00:00:00 2001 From: Paramita Dasgupta Date: Thu, 2 Apr 2026 00:09:18 -0500 Subject: [PATCH 1/2] Tune SPT landmark z for surface-like station-centric depth --- AraEvent/AraGeomTool.cxx | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/AraEvent/AraGeomTool.cxx b/AraEvent/AraGeomTool.cxx index 3810285..99913ae 100644 --- a/AraEvent/AraGeomTool.cxx +++ b/AraEvent/AraGeomTool.cxx @@ -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,0.305}; // 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}, From 49ee8e22759f4206acf364dd8ad6dd17bdbe11e5 Mon Sep 17 00:00:00 2001 From: Paramita Dasgupta Date: Thu, 2 Apr 2026 11:17:51 -0500 Subject: [PATCH 2/2] writting depth SPT in terms of fFtInm --- AraEvent/AraGeomTool.cxx | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/AraEvent/AraGeomTool.cxx b/AraEvent/AraGeomTool.cxx index 99913ae..4d8a0d1 100644 --- a/AraEvent/AraGeomTool.cxx +++ b/AraEvent/AraGeomTool.cxx @@ -54,7 +54,7 @@ Double_t fSouthPole2011_12[3]={27322.88*fFtInm,-3369.89*fFtInm,-36.02*fFtInm}; // 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,0.305}; // z in meters (tuned offset) +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},