A Radial Time Projection Chamber for α 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 4He. In such processes, the 4He nucleus remains intact in the final state, however the CEBAF Large Acceptance Spectrometer (CLAS) cannot track the low energy α particles. In 2009, we carried out measurements using the CLAS spectrometer supplemented by the RTPC positioned directly around a gaseous 4He target, allowing a detection threshold as low as 12 for 4He. This article discusses the design, principle of operation, calibration methods and the performances of this RTPC.
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