3 years ago

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

K. Hafidi, S. Kuhn, A. El Alaoui, A. Celentano, R. Dupré, R. De Vita, S. Bueltmann, Y. Perrin, E. Voutier, B. Torayev, P. Musico, K. Kosheleva, M. Hattawy, N. Baltzell, H. Fenker, S. Stepanyan, S. Minutoli, M. Oliver, L. El Fassi, M. Battaglieri

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.

Publisher URL: http://arxiv.org/abs/1706.10160

DOI: arXiv:1706.10160v3

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