EventPlaneHelper: invoke geometry invariant helper once

calculateChannelCenter() was called inside
GetPhiFT0 on every channel, recomputing all 208 channel
positions from scratch each time despite the geometry being
constant.

Author: ktf

Common/Core/EventPlaneHelper.cxx

@@ -74,7 +74,6 @@ double EventPlaneHelper::GetPhiFT0(int chno, const o2::ft0::Geometry& ft0geom)
     offsetY = mOffsetFT0AY;
   }
 
-  ft0geom.calculateChannelCenter();
   auto chPos = ft0geom.getChannelCenter(chno);
 
   return TMath::ATan2(chPos.Y() + offsetY, chPos.X() + offsetX);

Common/TableProducer/qVectorsTable.cxx

@@ -256,6 +256,7 @@ struct qVectorsTable {
     AxisSpec axisChID = {220, 0, 220};
 
     fv0geom = o2::fv0::Geometry::instance(o2::fv0::Geometry::eUninitialized);
+    ft0geom.calculateChannelCenter();
 
     histosQA.add("ChTracks", "", {HistType::kTHnSparseF, {axisPt, axisEta, axisPhi, axixCent}});
     histosQA.add("FT0Amp", "", {HistType::kTH2F, {axisFITamp, axisChID}});

PWGCF/JCorran/Tasks/jEPFlowAnalysis.cxx

@@ -444,6 +444,7 @@ struct JEPFlowAnalysis {
     ccdb->setCreatedNotAfter(std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch()).count());
 
     fv0geom = o2::fv0::Geometry::instance(o2::fv0::Geometry::eUninitialized);
+    ft0geom.calculateChannelCenter();
 
     detId = getdetId(cfgDetName);
     refAId = getdetId(cfgRefAName);