Improvement of the quantum efficiency of the New Super-HARP target

Abstract

The quantum efficiency of the New Super-HARP target has been improved to obtain an even better picture. To increase the quantum efficiency for green incident-light, two improvements have been made to the target. The first is doping the target with a suitable amount of tellurium on its incident-light side. The second is reducing the lithium-fluoride-doped layer to about 60% of the thickness of the conventional target. The improved version of the New Super-HARP target has higher quantum efficiency. Its quantum efficiency for green incident-light was evaluated to be double that of the conventional target. It was confirmed that the S/N is improved by three dB. that is, shot noise is reduced by three dB.