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For the high luminosity upgrade of the LHC at CERN, ATLAS is considering theaddition of a High Granularity Timing Detector (HGTD) in front of the end capand forward calorimeters at |z| = 3.5 m and covering the region 2.4 < |{\eta}|< 4 to help reducing the effect of pile-up. The chosen sensors are arrays of 50{\mu}m thin Low Gain Avalanche Detectors (LGAD). This paper presents results onsingle LGAD sensors with a surface area of 1.3x1.3 mm2 and arrays with 2x2 padswith a surface area of 2x2 mm^2 or 3x3 mm^2 each and different implant doses ofthe p+ multiplication layer. They are obtained from data collected during abeam test campaign in Autumn 2016 with a pion beam of 120 GeV energy at theCERN SPS. In addition to several quantities measured inclusively for each pad,the gain, efficiency and time resolution have been estimated as a function ofthe position of the incident particle inside the pad by using a beam telescopewith a position resolution of few {\mu}m. Different methods to measure the timeresolution are compared, yielding consistent results. The sensors with asurface area of 1.3x1.3 mm^2 have a time resolution of about 40 ps for a gainof 20 and of about 27 ps for a gain of 50 and fulfill the HGTD requirements.Larger sensors have, as expected, a degraded time resolution. All sensors showvery good efficiency and time resolution uniformity.

Beam test measurements of Low Gain Avalanche Detector single pads and arrays for the ATLAS High Granularity Timing Detector