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Title: Avalanche photodiode based time-of-flight mass spectrometry

This study reports on the performance of Avalanche Photodiodes (APDs) as a timing detector for ion Time-of-Flight (TOF) mass spectroscopy. We found that the fast signal carrier speed in a reach-through type APD enables an extremely short timescale response with a mass or energy independent <2 ns rise time for <200 keV ions (1−40 AMU) under proper bias voltage operations. When combined with a microchannel plate to detect start electron signals from an ultra-thin carbon foil, the APD comprises a novel TOF system that successfully operates with a <0.8 ns intrinsic timing resolution even using commercial off-the-shelf constant-fraction discriminators. By replacing conventional total-energy detectors in the TOF-Energy system, APDs offer significant power and mass savings or an anti-coincidence background rejection capability in future space instrumentation.
Authors:
; ; ; ; ;  [1]
  1. Southwest Research Institute, 6220 Culebra Road, San Antonio, Texas 78238 (United States)
Publication Date:
OSTI Identifier:
22482728
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 86; Journal Issue: 8; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CARBON; DISCRIMINATORS; ELECTRIC POTENTIAL; IONS; KEV RANGE 100-1000; MASS SPECTROSCOPY; MICROCHANNEL ELECTRON MULTIPLIERS; PERFORMANCE; PHOTODIODES; PULSE RISE TIME; RESOLUTION; SIGNALS; TIME-OF-FLIGHT METHOD; VELOCITY