CSCStrip Class Reference

This class represents the ADC samples for a single channel. More...

#include <CSCStrip.h>

List of all members.

Public Member Functions
	CSCStrip (unsigned int channel=0, int numSamples=0)
	Constructor of an empty strip object.
	~CSCStrip ()
	Destructor.
int	GetID ()
int	GetChannel ()
int	GetLayer ()
int	IsTransverse ()
int	GetPhi ()
int	IsLargeChamber ()
void	PutSample (int sample, int value)
	This function is used only by CSCCluster() during reading of the raw data.
short int	GetSample (int sample)
	Provides access to the ADC samples.
double	GetPeakingTime ()
double	GetAmplitude ()
short int	GetMinimum ()
short int	GetMaximum ()
short int	GetMinMax ()
double	GetPedestal ()
void	SetPedestal (double pedestal)
	Sets the pedestal value for this channel.
double	GetNoise ()
void	SetNoise (double n)
	Sets the noise value for this channel.
void	CorrectEstimates ()
	correct the result of the parabolic interpolation
int	FitBipolar (double width=6.5)
	Invokes Kostas bipolar fit The reulting amplitude is stored int the amp member and returned by each subsequent call to GetAmplitude().
double	GetFitChi2 ()
double	GetFitTime ()
void	Read (unsigned int *buf)
	This method is only used by the CSCCluster() class to read in raw data.
void	Print ()
	Prints the ADC values to stdout.

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Detailed Description

This class represents the ADC samples for a single channel.

It consists of a ATLAS channel ID that contains the channel number, the layer and the chamber, and of an array with the ADC samples.

Pedestal and noise are stored in the class and automatically subtracted. The constructor initializes the pedestal to 0, so no subtraction takes place until SetPedestal() is called. This is typically done with the CalServer class.

Status:

95% complete and well tested.

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Member Function Documentation

void CSCStrip::CorrectEstimates (   )

correct the result of the parabolic interpolation This method corrects the estimate of the peaking time and the amplitude by applying corrections derived from fitting the waveform to the shaper response function. The corrections are a function of the uncorrected peaking time and are calculated as a polynominal of 3rd order over pieces of the peaking time range. The corrected result replaces the old estimate. Repeated calls have no further effect. Note: This does not work yet for peaking times and not well for amplitudes.

int CSCStrip::FitBipolar (  double  width = 6.5  )

Invokes Kostas bipolar fit The reulting amplitude is stored int the amp member and returned by each subsequent call to GetAmplitude(). Parameters: width  the time constant of the waveform (6.1 - 6.7) Returns: the return code of the fitter.

double CSCStrip::GetAmplitude (   )  [inline]

Returns: the peaking amplitude of this strip. This is based on parabolic interpolation and the pedestal (if set) is subtracted. The unit is ADC counts. See also: SetPedestal(), CorrectEstimates().

int CSCStrip::GetChannel (   )  [inline]

Returns: the 0-based channel number

double CSCStrip::GetFitChi2 (   )  [inline]

Returns: the fit chi2 from the bipolar fit

double CSCStrip::GetFitTime (   )  [inline]

Returns: the peaking time from the bipolar fit

int CSCStrip::GetID (   )  [inline]

Returns: the 17 bit channel ID. See http://positron.ps.uci.edu/~schernau/ROD/2rt/CSCDataFormat.html Use GetChannel(), GetLayer(), IsTransverse(), and GetPhi() for easier access to the ID information.

int CSCStrip::GetLayer (   )  [inline]

Returns: the 0-based layer number

short int CSCStrip::GetMaximum (   )  [inline]

Returns: the largest ADC sample of this strip. There is no pedestal subtraction.

short int CSCStrip::GetMinimum (   )  [inline]

Returns: the smallest ADC sample of this strip. There is no pedestal subtraction.

short int CSCStrip::GetMinMax (   )  [inline]

Returns: the diference of the largest and the smallest ADC sample of this strip. There is no pedestal subtraction, since this is a peak-to-peak amplitude.

double CSCStrip::GetNoise (   )  [inline]

Returns: the noise value in ADC counts.

double CSCStrip::GetPeakingTime (   )  [inline]

Returns: the peaking time of this strip. This is based on parabolic interpolation and can range from 0 to the number of samples. The unit is sampling intervals, either 25ns or 50 ns. This time should be corrected with the sampling phase of the CSCChamber. To get the corrected time for 20 MHz sampling, use 50ns * peakingTime - 25ns * samplingPhase See also: CSCChamber->GetPhase(), CorrectEstimates().

double CSCStrip::GetPedestal (   )  [inline]

Returns: the pedestal in ADC counts. See also: SetPedestal().

int CSCStrip::GetPhi (   )  [inline]

Returns: the 0-based phi number

short int CSCStrip::GetSample (  int  sample  )  [inline]

Provides access to the ADC samples. Parameters: sample  the 0-based sample number. Returns: the ADC value of that sample witout pedestal subtaction. Caution: There is no range check on the sample parameter.

int CSCStrip::IsLargeChamber (   )  [inline]

Returns: 0 if this is a small CSC chamber, or 1 if it is a large one.

int CSCStrip::IsTransverse (   )  [inline]

Returns: 0 if it is a X channel, or 1 if it is a Y channel.

void CSCStrip::Print (   )

Prints the ADC values to stdout. Used for debugging.

void CSCStrip::PutSample (  int  sample, int  value )  [inline]

This function is used only by CSCCluster() during reading of the raw data. Parameters: sample  is the 0-based sample number. value  is the ADC value for that sample.

void CSCStrip::SetNoise (  double  n  )  [inline]

Sets the noise value for this channel. Parameters: n  the noise value in ADC counts. This method is used by the CalServer() class.

void CSCStrip::SetPedestal (  double  pedestal  )  [inline]

Sets the pedestal value for this channel. Parameters: pedestal  the pedestal value in ADC counts. This value is used in the GetAmplitude() method. This method is used by the CalServer() class.

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

• CSCStrip.h
• CSCStrip.cpp

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