Erlangen 2026 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 35: Instrumentation VI

HK 35.2: Vortrag

Donnerstag, 19. März 2026, 14:15–14:30, PHIL A 301

Implementation of the DOGMA DAQ for the P371 Experiment at CERN — •Huagen Xu and Michael Traxler for the P371 and the DOGMA collaboration — GSI Helmholtzzentrum für Schwerionenforschung GmbH

The P371 experiment at CERN investigates whether antiprotons are initially polarized during production in high-energy proton collisions with an unpolarized target. To test this hypothesis, a dedicated measurement was prepared at the T11 beamline in the East Area of the CERN PS. Assuming an analyzing power of approximately 4.5% in the CNI (Coulomb-Nuclear-Interference) region of antiproton-proton elastic scattering, the polarization can be detected by measuring the left-right asymmetry of elastic events at scattering angles around 10 mrad using a 3.5 GeV/c antiproton beam. The measurement concept is to use a liquid hydrogen target as an analyzer, with incident and scattered particle tracks reconstructed using tracking detectors, including straw tubes and microfibers, upstream and downstream of the target. Scattered antiprotons are identified and distinguished from background using a DIRC system for offline particle identification.

To fulfill this measurement, a new data acquisition system, DOGMA, was implemented for the first time, handling roughly 1800 readout channels. DOGMA is a modular DAQ board offering 32 input channels with an integrated amplifier (maximum gain of 30), discriminator, and TDC. The performance of the DOGMA system for the beam time will be presented.

Keywords: Antiproton-proton elastic scattering; Antiproton polarization; Dogma; DAQ; Experiment beam time