Development of a double metal, AC-coupled silicon pad detector

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 389; no. 3; pp. 415 - 420
• Main Authors: Lin, Willis T., Chang, Yuan-Hann, Chen, Augustine E., Hou, Suen R., Lin, Chih-Hsun, Kulinich, Piotr, Ryan, John, Steinberg, Peter, Wadsworth, Bernard, Wyslouch, Bolek
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 21.04.1997
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/S0168-9002(97)00346-X

A large area radial silicon pad detector has been produced, tested, and installed for the WA98 experiment at CERN. This paper describes the structure and the first test results of the silicon sensors used in this detector. Double metal technology has been used to lead the signals from the inner pads to the edge of the sensitive region. The capacitance for each pad has been measured and is shown to vary according to the pad size. Signals from 90Sr radiation have been analysed, and a signal-to-noise ratio of over 30 has been achieved. The RMS noise varies with the capacitance of each pad, and the variation agrees with the specification of the preamplifier. No evidence of cross talk due to the capacitance coupling between two metal layers has been observed.