First results on the ATLAS HL-LHC H35DEMO prototype

This article presents the first measured results from the H35DEMO pixel demonstrator. The H35DEMO is a prototype ASIC in the 0.35 m High Voltage-CMOS (HV-CMOS) process from ams aimed at proving that HV-CMOS sensor technologies are suitable as tracking detectors for the ATLAS High Luminosity-LHC (HL-LHC) upgrade. The prototype was fabricated in an engineering run, in which wafers with four different substrate resistivities, ranging from the standard value of 20  cm to a high value of 1 k  cm, were used to increase the depletion region of the sensor. The prototype includes four large area matrices and a few test structures. New experimental set-ups have been developed to measure the ASIC with radioactive sources and laser beams. The experimental set-ups and the measured results obtained will be discussed in this article.