Speakers
Mr
Davide Fiorina
(INFN & Università di Pavia)
Mr
Simone Calzaferri
(Università degli Studi di Pavia)
Description
In order to extend previous studies and test additional variables playing a role in the aging
processes, a Single Wire Proportional Chamber (SWPC) was specially designed. In this
contribution, the authors will present the result of two couples of tests performed on this SWPC.
During the first test, the SWPC was irradiated with X-rays and alpha particles sources with
the same hit rate until the same integrated charge (1.4 mC/cm) was reached. Nevertheless, the
performance loss during the X-ray irradiation was larger, traces of polymers were found on the
wire only in the case of alpha irradiation. The second test was performed irradiating the SWPC
with alphas and X-ray, but this time with the same anodic current i.e. very different hit rate. The
irradiation continued until the wire chamber lost half of the initial gas gain. As expected, in the
case of alpha irradiation the integrated charge needed for the goal was lower with respect to
the one needed during the X-ray radiation: 9.5 mC/cm and 33 mC/cm respectively. However,
the electron microscope analysis revealed, once again, a large polymer deposit on the alpha
irradiated wire while no deposit was found on the X-ray irradiated one.
Primary author
Mr
Davide Fiorina
(INFN & Università di Pavia)
