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Dernière mise à jour : mardi 18 février 2020, par Jérome Baudot

Development of double sided ladders for tracking in high-energy physics

Started October 2013, defense on 13 February 2017.
Research work pursued at DESY, Hambourg.

- Directors : Ingrid Maria GREGOR (DESY) & Jerome BAUDOT

The PLUME project develops ultra-light pixelated layers with specifications driven by the design of a vertex detector at the future e+e- International Linear Collider (ILC). The ILC will give access to final states like Hνν, as this work demonstrates for centre-of-mass energy 350 GeV and a luminosity of 250 fb-1. PLUME devices exploit the concept of double-sided ladders paved with thinned CMOS pixel sensors in order to reach a material budget of 0.35 % of radiation length. The present study validated that simultaneous operation of the 12 CMOS sensors integrated on such light ladders do not impact their electrical behaviour. Surface deformations were observed but a specific algorithm during the offline analysis was proposed and successfully tested to preserve the native sensor spatial resolution.
Finally, a measurement of the material budget of a less advanced ladder prototype has been performed at DESY test beam and yield 0.47±0.02 % of radiation length, matching the expected value.

Keywords : ILC, ILD, CMOS sensor, silicon sensor, vertex detector, PLUME ladder, material budget, radiation length, spatial resolution, mechanical deformation.