A new construction technique of high granularity and high transparency drift chambers for modern high energy physics experiments

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2016-07, Vol.824, p.512-514
• Main Authors: Chiarello, G., Chiri, C., Corvaglia, A., Grancagnolo, F., Miccoli, A., Panareo, M., Pepino, A., Pinto, C., Primiceri, P., Spedicato, M., Tassielli, G.F.
• Format: Article
• Language: English
• Subjects: Drift chambers; Lepton flavor violation; MEG experiment; Tracking detectors
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/j.nima.2015.12.021

Modern experiments for the search of extremely rare processes require high resolutions (order of 50–200keV/c) tracking systems for particle momenta in the range of 50–300MeV/c, dominated by multiple scattering contributions. We will present a newly developed construction technique for ultra-low mass Drift Chambers fulfilling this goal. It consists of (1) a semiautomatic wiring machine with a high degree of control over wire mechanical tensioning (better than 0.2g) and over wire positioning (of the order of 20μm) for simultaneous wiring of multi-wire layers; (2) a contact-less IR laser soldering tool designed for a feed-through-less wire anchoring system; (3) an automatic handling system for storing and transporting the multi-wire layers to be placed over the drift chamber end-plates. These techniques have been successfully implemented at INFN-Lecce and University of Salento and are currently being used for the construction of Drift Chamber of the MEG (μ→eγ) upgrade experiment.