Feb 20 – 22, 2017
FBK, Trento
Europe/Zurich timezone

Gain and time resolution of 50 um thin LGAD before and after irradiation

Feb 21, 2017, 3:25 PM
Aula Grande (FBK, Trento)

Aula Grande

FBK, Trento

Via Santa Croce, 77 38122 Trento ITALY


Joern Lange (IFAE Barcelona)


Silicon Low-Gain Avalanche Detectors (LGAD) are a promising technology for high energy physics experiments where high precision segmented timing sensors are required. This can be used for example in the ATLAS High Granularity Timing Detector (HGTD) or forward experiments like the ATLAS Forward Proton (AFP) and CMS-TOTEM Precision Proton Spectrometer (CT-PPS) for pileup removal. LGAD from a recent CNM production on a 50 um thin substrate were tested before and after neutron irradiation at Ljbuljana to 3e14 and 1e15 neq/cm2. The gain was measured with Sr90 beta particles, showing the expected gain degradation after irradiation, supposedly due to acceptor removal. The time resolution was studied at AFP beam tests in July and September 2016 at CERN SPS. A time resolution of <30 ps was achieved before irradiation, as well as after a fluence of 3e14 neq/cm2. At 1e15 neq/cm2, a time resolution of ~55 ps was measured at the maximum applied voltage of 620 V. It is found that the time resolution before and after irradiation follow a similar behaviour as a function of the gain achieved.


Primary author

Joern Lange (IFAE Barcelona)

Presentation materials