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Single-hit resolution measurement with MEG II drift chamber prototypes

Baldini, AM; Baracchini, E; Cavoto, G; Cascella, M; Cei, F; Chiappini, M; Chiarello, G; ... Voena, C; + view all (2016) Single-hit resolution measurement with MEG II drift chamber prototypes. Journal of Instrumentation , 11 , Article P07011. 10.1088/1748-0221/11/07/P07011. Green open access

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Abstract

Drift chambers operated with helium-based gas mixtures represent a common solution for tracking charged particles keeping the material budget in the sensitive volume to a minimum. The drawback of this solution is the worsening of the spatial resolution due to primary ionisation fluctuations, which is a limiting factor for high granularity drift chambers like the MEG II tracker. We report on the measurements performed on three different prototypes of the MEG II drift chamber aimed at determining the achievable single-hit resolution. The prototypes were operated with helium/isobutane gas mixtures and exposed to cosmic rays, electron beams and radioactive sources. Direct measurements of the single hit resolution performed with an external tracker returned a value of 110 μm, consistent with the values obtained with indirect measurements performed with the other prototypes.

Type: Article
Title: Single-hit resolution measurement with MEG II drift chamber prototypes
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/1748-0221/11/07/P07011
Publisher version: http://dx.doi.org/10.1088/1748-0221/11/07/P07011
Language: English
Additional information: Copyright © 2016 IOP Publishing Ltd and Sissa Medialab srl.
Keywords: Performance of High Energy Physics Detectors, Wire chambers (MWPC, Thin-gap chambers, drift chambers, drift tubes, proportional chambers etc), Gaseous detectors, Particle tracking detectors (Gaseous detectors)
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1515247
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