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Static Public Member Functions | List of all members
TpcSpaceChargeReconstructionHelper Class Reference

#include <coresoftware/blob/master/offline/packages/tpccalib/TpcSpaceChargeReconstructionHelper.h>

Static Public Member Functions

static void extrapolate_z (TH3 *hin)
 z extrapolation
 
static std::tuple< double, double > get_zref_range (double r)
 get reference z range used for phi extrapolation normalization at a given radius
 
static void extrapolate_phi1 (TH3 *hin)
 first phi extrapolation
 
static void extrapolate_phi2 (TH3 *hin)
 second phi extrapolation
 
static std::tuple< TH3 *, TH3 * > split (TH3 *hin)
 separate positive and negative z histograms
 
static TH3 * copy_histogram (TH3 *hin, const TString &name)
 

Detailed Description

Definition at line 15 of file TpcSpaceChargeReconstructionHelper.h.

View newest version in sPHENIX GitHub at line 15 of file TpcSpaceChargeReconstructionHelper.h

Member Function Documentation

TH3 * TpcSpaceChargeReconstructionHelper::copy_histogram ( TH3 *  hin,
const TString &  name 
)
static

copy input histogram into output, with new name, while adding two "guarding bins" on each axis, with identical content and error as the first and last bin of the original histogram this is necessary for being able to call TH3->Interpolate() when using these histograms to correct for the space charge distortions. TODO: is this really necessary ? Possibly one could just use the bin content for the correction rather than using TH3->Interpolate, in which case the "guarding bins" would be unnecessary. Should check if it leads to a significant deterioration of the momentum resolution

Definition at line 289 of file TpcSpaceChargeReconstructionHelper.cc.

View newest version in sPHENIX GitHub at line 289 of file TpcSpaceChargeReconstructionHelper.cc

References bins, index, and MATSCAN::phibins.

Referenced by TpcSpaceChargeMatrixInversion::calculate_distortions().

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void TpcSpaceChargeReconstructionHelper::extrapolate_phi1 ( TH3 *  hin)
static

first phi extrapolation

copy the full z dependence of reference sector to all other sectors, separately for positive and negative z, normalized by the measurement from provided micromegas, at the appropriate z

Definition at line 113 of file TpcSpaceChargeReconstructionHelper.cc.

View newest version in sPHENIX GitHub at line 113 of file TpcSpaceChargeReconstructionHelper.cc

References configureMap::ibin, myAnalysis::phi_max, myAnalysis::phi_min, and myAnalysis::phibin_max.

Referenced by TpcSpaceChargeMatrixInversion::calculate_distortions().

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void TpcSpaceChargeReconstructionHelper::extrapolate_phi2 ( TH3 *  hin)
static

second phi extrapolation

for each r, z and phi bin, linearly extrapolate between neighbor phi sector measurements

Definition at line 186 of file TpcSpaceChargeReconstructionHelper.cc.

View newest version in sPHENIX GitHub at line 186 of file TpcSpaceChargeReconstructionHelper.cc

References acts::error, ActsTests::PropagationDatasets::phi, myAnalysis::phi_max, myAnalysis::phi_min, myAnalysis::phibin_max, and square().

Referenced by TpcSpaceChargeMatrixInversion::calculate_distortions().

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void TpcSpaceChargeReconstructionHelper::extrapolate_z ( TH3 *  hin)
static

z extrapolation

interpolate between micromegas in the fully equiped sector

Definition at line 58 of file TpcSpaceChargeReconstructionHelper.cc.

View newest version in sPHENIX GitHub at line 58 of file TpcSpaceChargeReconstructionHelper.cc

References acts::error, physmon_track_finding_ttbar::r, square(), and physmon_track_finding_ttbar::z.

Referenced by TpcSpaceChargeMatrixInversion::calculate_distortions().

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static std::tuple<double, double> TpcSpaceChargeReconstructionHelper::get_zref_range ( double  r)
static

get reference z range used for phi extrapolation normalization at a given radius

std::tuple< TH3 *, TH3 * > TpcSpaceChargeReconstructionHelper::split ( TH3 *  hin)
static

separate positive and negative z histograms

split histograms in two, the first with negative z values only, the second with positive z values this must be done before adding guarding bins around each axis, in order to prevent artifacts during calls to Interpolate at the central membrane (z = 0)

Definition at line 237 of file TpcSpaceChargeReconstructionHelper.cc.

View newest version in sPHENIX GitHub at line 237 of file TpcSpaceChargeReconstructionHelper.cc

References acts::error, h, configureMap::ibin, and std::tr1::make_tuple().

Referenced by TpcSpaceChargeMatrixInversion::calculate_distortions().

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The documentation for this class was generated from the following files: