2019 SVT Alignment and Calibration

This page provides information on the alignment procedure of the SVT tracker for the 2019 data.

Data Samples

We start with elastically-scattered, full-energy electrons from the early calibration runs employing the Full Energy Electron (FEE) trigger.

For the field-off, straight track analysis we use run 10101.

For field-on data we use runs 10103 and 10104.

More details about the run can be found at 2019 Run Spreadsheet.

Event Reconstruction

Preliminary reconstruction was performed with a snapshot of the hps-java master using the HPS-PhysicsRun2019-v2-4pt5.

Event Selection

Since we are starting with an unaligned detector, and pattern recognition may be affected, we make rather tight selection cuts on the event as a whole to get a good quality sample of tracks. We start with a sample of events in which one and only one high energy cluster was found in the electromagnetic calorimeter, and one and only one track was found in the event.

Data Samples

We list data samples publicly available at SLAC. Samples can be made available at other locations if need be.

The samples are divided into top (290398 events) and bottom (318450 events) samples to allow calibration and alignment to be targeted.

/nfs/slac/g/hps_data2/data/physrun2019/hps_010103/skim/alignment/hps_010103.evio.00XXX_alignment_YY.slcio  XXX= 000 - 191 YY = top, bottom

/nfs/slac/g/hps_data2/data/physrun2019/hps_010104/skim/alignment/hps_010104.evio.00XXX_alignment_YY.slcio  XXX=000 - 206 YY = top, bottom

Working Directory

The primary working directory for these studies at SLAC is

/nfs/slac/g/hps_data2/data/physrun2019/feeAlignment/

Step-by-step guide

Related articles

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  2019 SVT Alignment and Calibration