A Radial Time Projection Chamber for $\alpha$ detection in CLAS at JLab

Abstract

A new Radial Time Projection Chamber (RTPC) was developed at the Jefferson Laboratory to track low-energy nuclear recoils for the purpose of measuring exclusive nuclear reactions, such as coherent Deeply Virtual Compton Scattering and coherent meson production off ${}^4$He. In such processes, the ${}^4$He nucleus remains intact in the final state, however the CEBAF Large Acceptance Spectrometer (CLAS) cannot track the low energy $\alpha$ particles. In 2009, we carried out measurements using the CLAS spectrometer supplemented by the RTPC positioned directly around a gaseous ${}^4$He target, allowing a detection threshold as low as 12$\sim$MeV for ${}^4$He. This article discusses the design, principle of operation, calibration methods and the performances of this RTPC.

Cited by in corpus (4)

• Electron-Ion Collider in China
• Gaseous and dual-phase time projection chambers for imaging rare processes
• Measurement of deeply virtual Compton scattering off Helium-4 with CLAS at Jefferson Lab
• Design, Construction, and Performance of the GEM based Radial Time Projection Chamber for the BONuS12 Experiment with CLAS12