Gas Distribution and Monitoring for the Drift Chamber of the MEG-II Experiment
A. M. Baldini, E. Baracchini, G. Cavoto, F. Cei, M. Chiappini, G., Chiarello, C. Chiri, M. Francesconi, L. Galli, F. Grancagnolo, M. Grassi, M., Hildebrandt, V. Martinelli, M. Meucci, D. Nicol\`o, M. Panareo, A. Papa, A., Pepino, B. Pruneti, F. Raffaelli, F. Renga, E. Ripiccini
TL;DR
This paper discusses the gas distribution and monitoring system for the MEG-II drift chamber, ensuring stable detector performance for precise positron tracking in a rare decay search.
Contribution
It introduces a novel online gas quality monitoring system and describes its implementation for the MEG-II drift chamber.
Findings
Stable drift chamber performance achieved
Effective online gas quality monitoring implemented
Enhanced detector reliability for MEG-II experiment
Abstract
The reconstruction of the positron trajectory in the MEG-II experiment searching for the decay uses a cylindrical drift chamber operated with a helium-isobutane gas mixture. A stable performance of the detector in terms of its electron drift properties, avalanche multiplication, and with a gas mixture of controlled composition and purity has to be provided and continuously monitored. In this paper we describe the strategies adopted to meet the requirements imposed by the target sensitivity of MEG-II, including the construction and commissioning of a small chamber for an online monitoring of the gas quality.
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