Silicon Strip Detector (SSD) calibration utilities

Introduction

The calibration procedure is described in proper ExpertRoot documentation section

Files in this directory demonstrate examples of work with ERCalibration functions. All the files are ready to use on er.jinr.ru host.

• ERCalibrationSSD.cxx - calibration classes and functions which are imported to user code.
• ssd_one_spectrum_calibration.C - thick sensor calibration example.
• non_uniform_map_building.C - thin sensor thickness map building example.
• thin_sensor_map_effective_to_real.C - recalculation of the effective thickness to real one. The non-uniform map building procedure gives effective thickness distribution. Recalculating may be required when the sensor is significantly shifted from a position where direct exposure assumption is applicable.

The folder auxiliary contains calculations of reference values including macros for dependencies fitting, comparison of ionization models.

• fit_eta.C - quadratic fit of the $$d()$$ dependence.
• fit_eloss_highE.C - energy loss fit depending on a dead layer thickness for $$$$ particle with start energy 7.6869 [MeV] used in the .
• ionization - files useful for comparing different ways of data production for the fitting dependencies.

Hydra.jinr.ru how-to

Prerequisites

Prerequisites for using calibration utilities on HybriLIT:

• Registarion on HybriLIT.
• The calibration run data need to be converted from *.lmd to *.root with TNeEvent-based library. Ask FLNR data aquisition specialists how to prepare data.

Setup environment

1. Connect to hydra.jinr.ru

ssh <username>@hydra.jinr.ru

1. Activate environment with ROOT version 18 or elder using module package.

module add FairRoot/v18.0.4

1. Enjoy calibraions!

Hints and tricks

Merge several root files

If you need to merge several root files into single file use hadd tool provided by ROOT.

cd <folder_with_root_files>
hadd <target_name>.root <list_of_files_to_merge> 

For additional information read hadd manual.

man hadd

• Example 1

Merge three *.root files into single output.root

hadd output.root file1.root file2.root file3.root

• Example 2

The <folder_with_root_files> contains files named clb_0001.root, clb_0002.root, ..., clb_0055.root. One wants to merge files with indicies from _0010 to _0029. It can be done quite elegant with regular expression:

hadd output.root $(find . -type f -regex "./clb_.*00[12].*")