Fall 2014 Commissioning Simulations

Overview

This page is for the organization and sharing of information about simulations for the Fall 2014 Commissioning data.

General Info

• Fall 2014 Commissioning Plan

Discussion Items

• Incoherent beam in bggen - simulate by moving coherent peak, check details of rate/shape (Sean)
• Commissioning target geometry in HDDS/sim-recon (Simon)
• Confirm that the simulation of EM background in HDGeant works for this running (Sean)
  • What gate should be used?
• Decide which version of sim-recon should be used Tag new sim-recon version (Mark)
• Nuclear recoil effects for exclusive modes - later studies if needed
  • Should we include effects for recoil protons?
  • Should we include other recoiling nuclei? (Carbon?)

Conditions

• Software
  • tags/sim-recon-cs1 (provisional name)
  • tags/hdds-cs1 (provisional name)
  • JANA 0.7.2
  • CCDB 1.02
• 200M bggen events with Solenoid @ 0 A and 1200 A
• Assume unpolarized photon beam 1 MHz/GeV at the endpoint

EM Background Simulations

The goal of these simulations is to determine the lowest field at which the solenoid magnet can be run while not having the detector overwhelmed with signals from background beam photons. The FDC and FCAL are the limiting factors.

• The zero magnetic field simulations described above.
• 1M each with Solenoid @ 50 A, 100 A, 200 A, 300 A

Other questions

• What is the background rate with no target?
• What is the background rate with various targets?

Hadronic Event Simulations

Overall hadronic rate

Reference: Fall 2014 Commissioning Plan

Assume 50 nA CW electron beam

Hadronic Event Rate

	1.5 µm Al	10 µm Al	30 µm Al
10mm CH2
2mm CH2
2/7mm CH2
3.4mm graphite

Final States

These reactions can be used either as benchmarks due to their large cross section or are interesting to various subdetectors

• γp→π⁺π^-p
• γp→π⁺π^-π⁰(p), π⁰→γγ
• γp→π⁺π^-π⁺π^-(p)
• γp→ηπ⁺π^-(p), η→γγ
• γp→K⁺K^-π⁺π^-(p)
• γp→K⁺Λ, Λ→pπ^-