Commit 450e7860 authored by Morag Jean Williams's avatar Morag Jean Williams
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Removing double explanation from README file.

parent 90dd5936
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Module to establish an association between clusters on a DUT plane and a reference track.
The association allows for cuts in position and time.
For the spatial cut, two options are implemented which can be chosen using `use_cluster_centre`.
By default, the distance of the cluster centre to the track intercept is compared to the `spatial_cut` in local coordinates. If larger than the cut, the cluster is not associated to the track.
The other option is to compare the distance of the closest pixel of a cluster to the track intercept (also in local coordinates).
By default, the distance of the closest pixel of a clusters to the track intercept is compared to the `spatial_cut` in local coordinates.
If larger than the cut, the cluster is not associated to the track.
This option can be chosen, e.g. for an efficiency analysis, when the cluster centre might be pulled away from the track intercept by a delta electron in the silicon.
The other option is to compare the distance of the cluster centre to the track intercept (also in local coordinates).
### Parameters
* `spatial_cut`: Maximum spatial distance in local coordinates in x- and y-direction allowed between cluster and track for association with the DUT. Expects two values for the two coordinates, defaults to twice the pixel pitch.
* `timing_cut`: Maximum time difference allowed between cluster and track for association for the DUT. Default value is `200ns`.
* `use_cluster_centre`: If set true, the cluster centre will be compared to the track position for the spatial cut. If false, the nearest pixel in the cluster will be used. Defaults to `false`. When secondary particles are created in your detector, such as delta rays, the cluster centre position can be far away from the initial particle incidence point with the DUT. This impacts some measurements, for example measuring detector efficiencies as then DUT clusters from delta rays will not be associated to telescope tracks due to being outside the spatial cut, and the % efficiency measurement will decrease. A way to recover these delta rays and therefore the lost % efficiency is by comparing the closest pixel in the DUT cluster, rather than the cluster centre, to the track incidence position to determine association.
* `use_cluster_centre`: If set true, the cluster centre will be compared to the track position for the spatial cut. If false, the nearest pixel in the cluster will be used. Defaults to `false`.
### Plots produced
* distance in x of cluster centre to track minus closest pixel to track
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