Münster 2002 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

HK: Physik der Hadronen und Kerne

HK 13: Poster Session: Heavy Ions

HK 13.8: Poster

Dienstag, 12. März 2002, 10:30–12:45, Foyer Chemie

Calibration and charged particle distributions of the Forward-TPCs in the STAR Experiment — •Jörn Putschke, Volker Eckardt, Andreas Gärtner, Gaspare Lo Curto, Markus Oldenburg, Patrizia Krok, Maria Mora, Andreas Schüttauf, Norbert Schmitz, Janet Seyboth, Peter Seyboth, Frank Simon, and Michael Vidal — Max-Planck-Institut für Physik, Föhringer Ring 6, 80805 München

The two Forward-TPCs, designed and constructed at the Max-Planck-Institut für Physik in Munich, expand the overall acceptance of the STAR detector at the Relativistic Heavy Ion Collider (RHIC) to the pseudorapidity region 2.5<|η|<4. Due to the high multiplicity of approximatly 500 charged particle in each Forward-TPC in a central Au+Au collisions at √s_NN = 200 GeV, a radial drift configuration perpendicular to the magnetic field was choosen to improve the two-track separation.

To calibrate the drift velocity and the E^→ × B^→ corrections in the non-uniform radial drift field a laser calibration system was used. In contrast to a standard configuration TPC a good measurement of the drift velocity is essential to accurately determine the spatial positions of the hit clusters and to precisely determine the momenta of the charged particles.

Preliminary results will be discussed on the charged particle distributions and the baryon number flow as difference in the distributions of positively and negatively charged particle as a function of η.