PCal Calorimeter

Overview
CLAS12 must detect neutral and charged pions with high momenta. Based on simulations, CLAS could not absorbe all the energy of electromagnetic showers created by electrons and photons having momenta higher than 5 GeV. The back of the calorimeter would produce a significant loss of energy resolution.

Purpose
The pre-shower calorimeter (PCal) is needed to reconstruct the energy of high-showering particles and to separate pions and photons. The PCal will have similar geometry to the current EC and use a scintillator, or a material that gives off light when struck by ionizing radiation. This lead-scintillator will include three stereo readout planes. Increasing the thickness of the scintillator to 15 cm, or about 5 radiation lengths will improve pion identification and the detection efficiency for neutrons.

Links
https://clasweb.jlab.org/wiki/index.php/PCAL_Commissioning

https://clasweb.jlab.org/wiki/index.php/PCAL_Cosmic_Ray_Tests

https://clasweb.jlab.org/wiki/index.php/CLAS12_Pre-shower_calorimeter

PCal Specifications: https://www.jlab.org/Hall-B/clas12-web/specs/pcal.pdf

https://clasweb.jlab.org/wiki/index.php/Procedures_for_Scintillator_strips_QC

PCal Procedures: https://clasweb.jlab.org/wiki/images/6/64/PCAL_procedures.pdf



PCal Poster: http://www.jlab.org/Hall-B/int-web/interest/OH-2012/posters/PCAL-Poster.pdf

Scintillator Preparation- jlabdaq: http://jlabdaq.pcs.cnu.edu/wiki/index.php/Scintillator_Preparation