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ATLAS Offline Software
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ATLAS Offline Software
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The main purpose of this package is to provide an algorithm to build CSC (cathode strip chamber) clusters. The latter serve as input for the construction of CSC segments or may be directly in track finding and fitting. The currently supported algorithm is called CscThresholdClusterBuilder and it uses a simple strategy of clustering adjacent hit strips whose total charge is above a threshold specified in the job options.
The package also provide some supporting tools that may also be used in other contexts. Strip fitters (interface ICscStripFitter) are used to assign the total charge and time using the time samples associated with a strip. Cluster fitters (interface ICscClusterFitter) calculate the position and error for a cluster.
One strip fitter is provided. CalibCscStripFitter calls the CSC calib tool and uses its charge and time if the call is succssful. If not, it returns the peak charge and its time. Fixed errors (values defined as job options) are returned in either case.
Two cluster fitters are provided. SimpleCscClusterFitter assigns the position at the center of the cluster and uses the effective with (cluster minus inherent) to assign an error. QratCscClusterFitter use the method of adjacent charge ratios with a lookup table to convert strip position to geometric position.
The tools and algorithm are configured in python. Use the following to access the default instances:
from CscClusterization.CalibCscStripFitter import theCalibCscStripFitter from CscClusterization.SimpleCscClusterFitter import theSimpleCscClusterFitter from CscClusterization.QratCscClusterFitter import theQratCscClusterFitter from CscClusterization.CscThresholdClusterBuilder import theCscThresholdClusterBuilder
The orginal clusterization algorithm CscClusterBuilder is deprecated and has been removed. Some of its supporting components, CscAverage, CscFit and CscParabola, have been retained for possible future use.
1.8.18