Heidelberg 2015 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 21: Instrumentation 7
HK 21.7: Talk
Tuesday, March 24, 2015, 16:15–16:30, M/HS1
A tracking system for a secondary pion beam at the HADES spectrometer — •Joana Wirth1,2, Laura Fabbietti1,2, Rafal Lalik1,2, and Ludwig Maier1 for the HADES collaboration — 1Physik Deparment of the TUM ( E12), Garching — 2Exellence Cluster "Universe", Garching
For the secondary pion beam campaign with the HADES spectrometer at GSI, Darmstadt, a beam tracking system has been developed, in order to achieve the momentum measurement of each individual pion with a momentum resolution below 0.5%. A primary Nitrogen beam impacting on a Beryllium production target produces a secondary pion beam strongly defocused in position and momentum, which is transported along the chicane to the experimental area. The overall spread in momentum is only limited by the beamline acceptance, leading to momentum offsets up to 8% of the central beam momentum.
The system is based on two tracking stations consisting each of a double-sided silicon strip detector read out by the self-triggered n-XYTER ASCI chip, completed by the TRB3 board on which the trigger logic is implemented.
In this talk we are showing the performance of our beam detectors during the proton test beam of 1.9 GeV in the terms of the momentum reconstruction of known momentum, set by the accelerator, as well as the recent result accomplished throughout the pion beam campaign.
* supported by BMBF 05P12WOGHH and Excellence Cluster "Universe"