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Description
A gas detector with a size of 140×140×140 mm$^3$, named the Compact Active Target Time Projection Chamber (CAT-TPC), has been developed aiming to measure resonant scattering associated with cluster structures in unstable nuclei. The CAT-TPC consists of an electronic field cage, double thick gas-electron-multiplier foils, a general purpose digital data acquisition system, and especially a newly developed two-dimensional strip-readout structure. The CAT-TPC was operated with $^4$He (96%) + CO$_2$ (4%) gas mixture at 400 mbar. The working gas also serves as an active target for tracking of charged particles. The overall performances of this CAT-TPC were evaluated by using a collimated alpha-particle source. A time resolution of less than 20 ns and a position resolution of less than 0.2 mm was observed along the electron drift direction. The three-dimensional images of incident trajectories and scattering events can be clearly reconstructed with an angular resolution of about 0.45 degree.
| Experimental nuclear physics | 1 |
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