Bonn 2020 – wissenschaftliches Programm
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HK 14.5: Vortrag
Dienstag, 31. März 2020, 18:15–18:30, J-HS M
In-beam tests results for the PANDA STT — •Gabriela Perez-Andrade, Peter Wintz, and James Ritman for the PANDA collaboration — Institut für Kernphysik, Forschungszentrum Jülich, Germany
At the PANDA experiment, fundamental hadron physics questions will be addressed through pp annihilations in a p momentum range from 1.5 to 15 GeV/c. The Straw Tube Tracker (STT), in the solenoidal magnetic field of the PANDA target spectrometer, has the tasks of charged particle tracking, momentum reconstruction, and particle identification (PID) based on the energy loss measurement (dE/dx) in the straw gas. The STT will provide PID information for p/K/π separation in the low momentum region up to ∼0.8 GeV/c. For a full 3D track reconstruction, the STT consists of axial and stereo straw layers. The technique of self-supporting, close-packed straw layer modules yields a minimal material budget of 1.2% (X/X0). In-beam measurements with a STT test system have been conducted at COSY (Forschungszentrum Jülich), using proton and deuteron beams in a momentum range of ∼ 0.6 - 2.5 GeV/c. Preliminary results show a 2D track resolution of ∼120 µm (σrφ), which corresponds to 2.5 mm (σz) for the stereo layers in the beam direction. Furthermore, a PID method based on time-over-threshold measurement was tested, showing that proton and deuteron separation from minimum ionising particles of 4σ at 0.8 GeV/c is obtained, rising to about 12σ for 0.6 GeV/c deuterons. In this talk, the calibration, tracking and PID methods together with the preliminary test results will be discussed.