3–10 Aug 2016
Chicago IL USA
US/Central timezone
There is a live webcast for this event.

Improvement of Spatial Resolution by Selfconsistent Full Muon Track Reconstruction in Gaseous Detectors (12' + 3')

6 Aug 2016, 12:15
15m
Chicago 8

Chicago 8

Oral Presentation Detector: R&D and Performance Detector: R&D and Performance

Speaker

Bernhard Matthias Flierl (Ludwig-Maximilians-Univ. Muenchen (DE))

Description

Full track reconstruction for charged particles in thin gaseous detectors can be achieved using a Time-Projection-Chamber like (TPC) readout and analysis method. This method has proven to be very successfull for thermal neutron detection in gaseous electron multiplier (GEM) detectors, based on the full track reconstruction of the charged Helium and Lithium ions produced in a thin $^{10}$B conversion layer building the cathode of the triple GEM detector. An improvement from FWHM 3.4 mm to 0.25 mm of the spatial resolution of the interaction point of the neutron in the $^{10}$B layer has been observed using an Ar-CO$_2$ gas mixture as detector gas. For the achievable track resolution the driftvelocity and thus the composition of the drift gas is of big importance. A self-consistent algorithm allows for optimized results without the development of gas-parameters, as otherwise usual, in prior test experiments with well known angle of incidence of the ions. Simulations predict, that by application of this method the spatial resolution for minimal ionizing particles can be improved as well. For verification a compact cosmic muon telescope has been commissioned, which consists of three triple GEM detectors with two-dimensional strip readout of 0.4 mm pitch in x and y and one detector with a single strip readout layer of 0.25 mm pitch. All strips are read out by APV25 frontend boards. Muon tracks are reconstructed using the TPC-like method in one of the detectors and are then compared to the predicted track from the other three detectors defined by the center of charge position in every detector. A strong dependence of the composition of the detector gas is expected. We report on our study of Argon and Helium based noble gas mixtures with carbon-dioxide as quencher.

Primary author

Bernhard Matthias Flierl (Ludwig-Maximilians-Univ. Muenchen (DE))

Presentation materials