Abstract
A new cylindrical drift chamber is currently under construction for the MEG II experiment. The chamber is meant to track low momentum positrons from μ+ decays to search for μ+→e+γ events. The detector is segmented in very small drift cells, placed in stereo configuration and operated in a helium-isobutane gas mixture. The use of thin aluminium wires and light gas mixture set the total radiation length of the chamber to only 1.6×10-3X0 per track turn allowing for a momentum resolution of ∼120 keV/c.
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Baldini, A. M., Baracchini, E., Berretta, L., Bianucci, S., Cavoto, G., Chiarello, G., … Zullo, A. (2016). A new cylindrical drift chamber for the MEG II experiment. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 824, 589–591. https://doi.org/10.1016/j.nima.2015.10.103
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