Speaker
Tanja Haas
(Phys. Institut Heidelberg)
Description
The LHCb experiment is a single arm spectrometer, designed to study CP
violation in B-decays at the Large Hadron Collider (LHC). It is crucial to
accurately and efficiently detect the charged decay particles, in the high-
density particle environment of the LHC. For this, the Outer Tracker (OT) is
being constructed, consisting of ∼55,000 straw tubes, covering in total an
area of 360 m 2 of double layers. The detector is foreseen to operate under
large particle rates, up to 100 kHz/cm per straw in the region closest to the
beam. Despite extensive ageing tests conducted earlier on with the aid of
test-modules, a degradation of the gas gain has been found in the mass-
production modules under a rather modest level of radiation. This paper
presents the observed phenomenon, together with ongoing investigations to
both prevent the effect, as well as to repair the gain loss.
Author
Tanja Haas
(Phys. Institut Heidelberg)
Co-author
Niels Tuning
(NIKHEF Amsterdam)
