AxialTrackCreatorHitLegendre Class Reference

Generates axial tracks from hit using special leaf postprocessing. More...

#include <AxialTrackCreatorHitLegendre.h>

Inheritance diagram for AxialTrackCreatorHitLegendre:

Collaboration diagram for AxialTrackCreatorHitLegendre:

Public Types
enum class	EPass {   NonCurlers ,   NonCurlersWithIncreasingThreshold ,   FullRange ,   Straight }
	Pass keys for the different sets of predefined parameters for a pass if legendre search Note: Naming copied from original location. More...
using	IOTypes = std::tuple< AIOTypes... >
	Types that should be served to apply on invokation.
using	IOVectors = std::tuple< std::vector< AIOTypes >... >
	Vector types that should be served to apply on invokation.

Public Member Functions
	AxialTrackCreatorHitLegendre ()
	Constructor.
	AxialTrackCreatorHitLegendre (EPass pass)
	Constructor from a pass key.
std::string	getDescription () final
	Short description of the findlet.
void	exposeParameters (ModuleParamList *moduleParamList, const std::string &prefix) final
	Expose the parameters to a module.
void	initialize () final
	Initialisation before the event processing starts.
void	apply (const std::vector< const CDCWireHit * > &axialWireHits, std::vector< CDCTrack > &tracks) final
	Execute one pass over a quad tree.
virtual void	apply (ToVector< AIOTypes > &... ioVectors)=0
	Main function executing the algorithm.
void	beginRun () override
	Receive and dispatch signal for the beginning of a new run.
void	beginEvent () override
	Receive and dispatch signal for the start of a new event.
void	endRun () override
	Receive and dispatch signal for the end of the run.
void	terminate () override
	Receive and dispatch Signal for termination of the event processing.

Protected Types
using	ToVector = typename ToVectorImpl< T >::Type
	Short hand for ToRangeImpl.

Protected Member Functions
void	addProcessingSignalListener (ProcessingSignalListener *psl)
	Register a processing signal listener to be notified.
int	getNProcessingSignalListener ()
	Get the number of currently registered listeners.

Private Types
using	Super = Findlet< const CDCWireHit *const, CDCTrack >
	Type of the base class.
using	CandidateReceiver = AxialHitQuadTreeProcessor::CandidateReceiver
	lambda function used for postprocessing

Private Member Functions
std::unique_ptr< AxialHitQuadTreeProcessor >	constructQTProcessor (EPass pass)
	Method to create QTProcessor that performs the search.
void	executeRelaxation (const CandidateReceiver &candidateReceiver, AxialHitQuadTreeProcessor &qtProcessor)
	Performs quadtree search. More...

Private Attributes
EPass	m_pass = EPass::NonCurlers
	The pass key for lookup of the parameters for this pass.
const double	m_param_stepScale = 0.75
	Parameter to define multiplier for hits threshold for the next quadtree iteration.
int	m_param_minNHits = 10
	Parameter to define minimal threshold of hit.
double	m_param_precision = 0.00000001
	Parameter to define precision of quadtree search in case of straight pass.
std::vector< ProcessingSignalListener * >	m_subordinaryProcessingSignalListeners
	References to subordinary signal processing listener contained in this findlet.
bool	m_initialized = false
	Flag to keep track whether initialization happend before.
bool	m_terminated = false
	Flag to keep track whether termination happend before.
std::string	m_initializedAs
	Name of the type during initialisation.

Detailed Description

Generates axial tracks from hit using special leaf postprocessing.

Implements Legendre transformation of the drift time circles. This is a module, performing tracking in the CDC. It is based on the paper "Implementation of the Legendre Transform for track segment reconstruction in drift tube chambers" by T. Alexopoulus, et al. NIM A592 456-462 (2008).

Definition at line 32 of file AxialTrackCreatorHitLegendre.h.

Member Enumeration Documentation

EPass

enum EPass

strong

Pass keys for the different sets of predefined parameters for a pass if legendre search Note: Naming copied from original location.

Does not actually match with the associated parameters.

Enumerator
NonCurlers	Pass corresponds to High-pt track finding and more deeper quadtree.
NonCurlersWithIncreasingThreshold	Pass corresponds to High-pt track finding and more rough quadtree.
FullRange	Pass corresponds to full pt range and even more rough quadtree (non-ip tracks, tracks with energy losses etc)
Straight	Pass corresponds to very High-pt track and very rough quadtree (monopole tracks, including those with low hit count)

Definition at line 44 of file AxialTrackCreatorHitLegendre.h.

                       {
        NonCurlers,
        NonCurlersWithIncreasingThreshold,
        FullRange,
        Straight
      };

Member Function Documentation

executeRelaxation()

void executeRelaxation ( const CandidateReceiver &  candidateReceiver, AxialHitQuadTreeProcessor &  qtProcessor  )

private

Performs quadtree search.

Parameters

candidateReceiver	lambda interface process found leaves in the legendre search
qtProcessor	reference to the AxialHitQuadTreeProcessor instance

Definition at line 131 of file AxialTrackCreatorHitLegendre.cc.

{
  // radius of the CDC
  const double rCDC = 113.;
 
  // Curvature for high pt particles that leave the CDC
  const double curlCurv = 2. / rCDC;
 
  // find leavers
  qtProcessor.fill(candidateReceiver, 50, curlCurv);
 
  // find curlers with diameter higher than half of radius of CDC
  qtProcessor.fill(candidateReceiver, 70, 2 * curlCurv);
 
  // Start relaxation loop
  int minNHits = m_pass == EPass::FullRange ? 30 : 50;
  double maxCurv = m_pass == EPass::FullRange ? 0.15 : 0.07;
  do {
    qtProcessor.fill(candidateReceiver, minNHits, maxCurv);
 
    minNHits = minNHits * m_param_stepScale;
 
    if (m_pass != EPass::NonCurlers) {
      maxCurv *= 2.;
      if (maxCurv > 0.15) maxCurv = 0.15;
    }
 
  } while (minNHits >= m_param_minNHits);
}

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

• tracking/trackFindingCDC/findlets/minimal/include/AxialTrackCreatorHitLegendre.h
• tracking/trackFindingCDC/findlets/minimal/src/AxialTrackCreatorHitLegendre.cc