München 2019 – wissenschaftliches Programm
HK 54.51: Poster
Donnerstag, 21. März 2019, 16:30–19:00, Foyer Theresanium
Implementation of an automated position and tension determination of wires in MWPCs — •Murat Esen for the CBM collaboration — Institut für Kernphysik, Uni Frankfurt
The Compressed Baryonic Matter (CBM) experiment at the Facility for Antiproton and Ion Research (FAIR) will be dedicated to the exploration of the QCD phase-diagram in the region of high netbaryon densities. As part of the experimental setup a Transition Radiation Detector (TRD) will deliver tracking and particle identification information. Each layer of the TRD is composed of several Multi-Wire Proportional Chambers (MWPC). In order to guarantee the desired performance a constant gas gain and thus a constant electromagnetic field is required. Therefore it must be ensured that the values for tension and position of all wires fulfill a certain accuracy. Otherwise, an inhomogeneous electric field would develop in the chambers and the gas gain and thus the measured data would deteriorate. Since more than 200 chambers have to be built and each is equipped with up to 400 wires, a manual check of the tension and position of each wire could hardly be carried out. For this reason the so-called Wire-Test-Device (WTD), which was originally developed for the construction of the ALICE-TRD, was adapted and further improved. The purpose of this device is to carry out the tension and position measurement automatically. Its working principle, especially the newly written program code of its software, will be presented in this poster.