Largeangle Calorimeter

Concept

The Largeangle Calorimeter (LC) provides particle ID for the large acceptance region of SIDIS Main Page experiments.

• Preshower- shower configuration
• Incidental momentum 3~7 GeV/c
• Provide a pion rejection factor of 200:1
• coverage: 13~22 degree (CDF design)
• In 1.5T field
• Radiation hard
• Better be thin, small radiation length

Calorimeter

Option: W-SciFi

Introduction

Reading:

• A tungsten/scintillating fiber electromagnetic calorimeter prototype for a high-rate muon (g−2) experiment, NIM Volume 602, Issue 2, 21 April 2009, Pages 396-402
• A high-resolution lead /scintillating fiber electromagnetic calorimeter, NIMA, Volume 294, Issue 3, 15 September 1990, Pages 446-458

Simulation tools:

• SVN source [1]
• Adopted from [Solid_Forward_Calorimeter#how_to_run_code forward|angle calorimeter simulation]
• Added support for
  • Set field from mac script: ex. mac/TestFile.mac
  • Added hadron simulation, beam of pion, kaon from mac script: ex. mac/TestFile.mac
  • Added option for preshower - shower confirguration: switch configurations at src/CaloSimDetectorConstruction.C::Construct()
  • Script tools to convert GEMC phase space to input file and load via mac scripts: high level script at script/GEMC2CaloSimScript.C

Initial Studies

3 electrons in LC with 1.5T magnetic field

E/p for LC; Left: pi-; Right: electron; BaBar flat phase space

• Shower Only Configuration
  • Simulated w/ 1.5T field; fiber is along the field direction; W plate is placed along the azimuthal direction.
  • E/p plot is shown on the right
  • Reasonable Pion electron separation

• PreShower-Shower Configuration
  • Talk on Mar 25, 2011 collaboration meeting
  • A results log with 4cm pre-shower and 15cm shower

Light Collection and Detection

Option: Silicon based PMT

Popular choice but not a good one for LC, due to high background.

DAQ

FPGA based waveform digitalizer?