Single-hit resolution measurement with MEG II drift chamber prototypes

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 $\mu$m, consistent with the values obtained with indirect measurements performed with the other prototypes.

arXiv comment18 pages, 18 figures

References in corpus (3)

• The BABAR Detector
• MEG Upgrade Proposal
• The MEG detector for $\mu +\to e+\gamma$ decay search

Cited by in corpus (9)

• The design of the MEG II experiment
• The Search for ${\mu }^{+}\to e^{+}\gamma$ with 10${}^{-14}$ Sensitivity: the Upgrade of the MEG Experiment
• The Quest for $\mu \to e\gamma$ and its Experimental Limiting Factors at Future High Intensity Muon Beams
• Gas Distribution and Monitoring for the Drift Chamber of the MEG-II Experiment
• Detailed analysis of chemical corrosion of ultra-thin wires used in drift chamber detectors
• Commissioning of the MEG II tracker system
• The new drift chamber of the MEG II experiment
• The Drift Chamber of the MEG II experiment
• The measuring systems of the wire tension for the MEG II Drift Chamber by means of the resonant frequency technique