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Description
Low-Gain Avalanche Diodes (LGADs) exhibit excellent timing performance, in the orders of a few tens of ps, thanks to a combination of high signal-to-noise ratio and short rise time. This technology has attracted interest for applications in a wide variety of fields such as in timing detectors for High-Energy Physics experiments or for the detection of neutrons with precise timing, among others.
We present the response of two different types of LGAD sensors, designed and fabricated at the Brookhaven National Laboratory, to 14.1 MeV fast neutrons generated by Deuterium-Tritium source.
However, LGAD devices aiming for timing performance suffer from poor spatial resolution. To overcome this limitation, the AC-coupled LGAD (AC-LGAD) approach was introduced. We detail the fabrication and the first functional tests of such new device, which solves this drawback while retaining timing performance comparable to that of a regular LGAD.
AC-LGADs have been fabricated at the BNL silicon processing facility, and their response characterized with radioactive sources and transient current technique. Results show large gains and fast signal, while the noise is comparable to that of a standard LGADs.