Spiral silicon drift detectors

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6613801

Rehak, P; Gatti, E; Longoni, A; Sampietro, M; Holl, P; Lutz, G; Kemmer, J; Prechtel, U; Ziemann, T

An advanced large area silicon photodiode (and x-ray detector), called Spiral Drift Detector, was designed, produced and tested. The Spiral Detector belongs to the family of silicon drift detectors and is an improvement of the well known Cylindrical Drift Detector. In both detectors, signal electrons created in silicon by fast charged particles or photons are drifting toward a practically point-like collection anode. The capacitance of the anode is therefore kept at the minimum (0.1pF). The concentric rings of the cylindrical detector are replaced by a continuous spiral in the new detector. The spiral geometry detector design leads to a decrease of the detector leakage current. In the spiral detector all electrons generated at the silicon-silicon oxide interface are collected on a guard sink rather than contributing to the detector leakage current. The decrease of the leakage current reduces the parallel noise of the detector. This decrease of the leakage current and the very small capacities of the detector anode with a capacitively matched preamplifier may improve the energy resolution of Spiral Drift Detectors operating at room temperature down to about 50 electrons rms. This resolution is in the range attainable at present only by cooled semiconductor detectors. 5 refs., 10 figs.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6613801
• Report Number(s): BNL-42147; CONF-881103-29; ON: DE89005770
• Country of Publication: United States
• Language: English

Related Subjects

440104* -- Radiation Instrumentation-- High Energy Physics Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BOUNDARY CONDITIONS
DESIGN
ENERGY RESOLUTION
MEASURING INSTRUMENTS
RADIATION DETECTORS
RESOLUTION
SEMICONDUCTOR DETECTORS
SI SEMICONDUCTOR DETECTORS
SPECTRA
WAVE FORMS
X-RAY SPECTRA