Recovery of LHCb Detector Muon Chambers for Malter Effect Elimination


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Abstract

A method is presented for restoring the performance of gas discharge detectors wherein a spontaneous self-sustaining current, i.e., Malter effect, occurs. A successful practical implementation of the method is demonstrated by the example of recovery of operability for multiwire proportional chambers used in the muon detector of the LHCb experiment carried out at the Large Hadron Collider. Four proportional chambers wherein Malter currents regularly occur during the experiment were subjected to high-voltage discharge training in the working gas mixture of 40% Ar + 55% CO2 + 5% CF4 with 2% of oxygen added. It is shown that, with addition of oxygen, the recovery of the proportional chambers occurs tens of times faster in compare to the training in the working gas mixture. The reconstructed chambers were installed in the LHCb muon detector and have been working in a collider beam experiment for more than two years already.

About the authors

G. E. Gavrilov

Petersburg Nuclear Physics Institute

Author for correspondence.
Email: gavrilov_ge@pnpi.nrcki.ru
Russian Federation, Gatchina, Leningrad oblast, 188300

O. E. Maev

Petersburg Nuclear Physics Institute

Email: gavrilov_ge@pnpi.nrcki.ru
Russian Federation, Gatchina, Leningrad oblast, 188300

D. A. Maisuzenko

Petersburg Nuclear Physics Institute

Email: gavrilov_ge@pnpi.nrcki.ru
Russian Federation, Gatchina, Leningrad oblast, 188300

S. A. Nasybulin

Petersburg Nuclear Physics Institute

Email: gavrilov_ge@pnpi.nrcki.ru
Russian Federation, Gatchina, Leningrad oblast, 188300

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