Frankfurt 2014 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 64: Instrumentierung

HK 64.6: Vortrag

Freitag, 21. März 2014, 15:15–15:30, HZ 9

Performance Test and Commissioning of Recoil Detectors of HESR Day-One Experiment — •qiang hu1,2, huagen xu2, and james ritman21Institute of Modern Physics, CAS, 730000 Lanzhou, China — 2Forschungszentrum Juelich, 52425 Juelich, Germany

The proposed Day-One experiment at HESR is to measure antiproton-proton elastic scattering in a large range of four momentum transfer squared t (0.0008 - 0.1 GeV2). One goal of the experiment is to determine the elastic differential parameters, i.e. σT, ρ and b. The elastic scattered antiproton and recoil proton will be measured by tracking detectors in the forward angle region and by recoil detectors near θ=90, respectively. The recoil detectors consist of two silicon detectors and two germanium detectors which cover a polar angle from 71 to 91.5. All detectors are single-sided structure with 1.2 mm pitch on the front side. The two silicon detectors have the same dimensions, 76.8 mm × 50.0 mm × 1.0 mm. The two germanium detectors have the same sensitive area but different thickness, 80.4 mm × 50.0 mm × 5.0 (11.0) mm.

After assembling and system tests in the laboratory with radioactive source 244Cm, the detector system has been installed into COSY ring. The commissioning experiments by using proton beam has been performed in 2013. Data of proton-proton elastic scattering has been taken at several momenta. Preliminary data analysis indicate that the recoil detectors are working as good as expected. The latest results will be presented.

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