Abstract
In this paper, we present the R & D activity on a new GEM-based Time Projection Chamber (GEM-TPC) detector for the inner region of the AMADEUS experiment, which is aiming to perform measurements of low-energy negative kaon interactions in nuclei at the DAΦNE e+ e- collider at LNF-INFN. A novel idea of using a GEM-TPC as a low mass target and detector at the same time comes motivated by the need of studying the low energy interactions of K- with nuclei in a complete way, tracking and identifying all of the produced particles. Even more, what makes the experimental proposal revolutionary is the possibility of using different gaseous targets without any other substantial intervention on the experimental setup, making it a flexible multipurpose device. This new detection technique applied to the nuclear physics requires the use of low-radiation length materials and very pure light gases such as Hydrogen, Deuterium, Helium-3, Helium-4, etc. In order to evaluate the GEM-TPC performances, a 10 × 10 cm2 prototype with a drift gap of 15 cm has been realized. The detector was tested at the πM1 beam facility of the Paul Scherrer Institut (PSI) with low momentum pions and protons. Detection efficiency and spatial resolution, as a function of gas mixture, gas gain and ionazing particle, are reported and discussed.
Highlights
IntroductionAn important, yet unsolved problem, in hadron physics is how the hadron masses and interactions change in the
An important, yet unsolved problem, in hadron physics is how the hadron masses and interactions change in theHow to cite this paper: Poli Lener, M., Corradi, G., Curceanu, C., Tagnani, D., Vidal, A.R. and Zmeskal, J. (2015) Performances of an Active Target GEM-Based TPC for the AMADEUS Experiment
The dedicated AMADEUS setup will be implemented inside the KLOE [3] Drift Chamber (DC), in the free space between the beam pipe and the DC entrance wall
Summary
An important, yet unsolved problem, in hadron physics is how the hadron masses and interactions change in the. (2015) Performances of an Active Target GEM-Based TPC for the AMADEUS Experiment. This topic could be investigated by means of “in-medium hadron-mass spectroscopy”, producing bound states of a hadron by which to extract the hadron-nucleus potential and the in-medium hadron masses. The dedicated AMADEUS setup will be implemented inside the KLOE [3] Drift Chamber (DC), in the free space between the beam pipe and the DC entrance wall. The main component of the experimental setup to be developed is an active target GEM-based [4] Time Projection Chamber [5] (GEM-TPC), which will act as low mass target and particles tracking detector at the same time.
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