Projects per year
Abstract
Diamond-based photomultipliers have the potential to provide a significant improvement
over existing devices due to diamond’s high secondary electron yield and narrow energy
distribution of secondary electrons which improves energy resolution creating extremely fast response
times. In this paper we describe an experimental apparatus designed to study secondary
electron emission from diamond membranes only 400 nm thick, observed in reflection and transmission
configurations. The setup consists of a system of calibrated P22 green phosphor screens
acting as radiation converters which are used in combination with photomultiplier tubes to acquire
secondary emission yield data from the diamond samples. The superior signal voltage sampling
of the phosphor screen setup compared with traditional Faraday Cup detection allows the variation
in the secondary electron yield across the sample to be visualised, allowing spatial distributions
to be obtained. Preliminary reflection and transmission yield data are presented as a function of
primary electron energy for selected CVD diamond films and membranes. Reflection data were
also obtained from the same sample set using a Faraday Cup detector setup. In general, the curves
for secondary electron yield versus primary energy for both measurement setups were comparable.
On average a 15–20% lower signal was recorded on our setup compared to the Faraday Cup, which
was attributed to the lower photoluminescent efficiency of the P22 phosphor screens when operated
at sub-kilovolt bias voltages.
Original language | English |
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Article number | P03004 |
Number of pages | 18 |
Journal | Journal of Instrumentation |
Volume | 10 |
Issue number | March 2015 |
DOIs | |
Publication status | Published - 3 Mar 2015 |
Keywords
- diamond
- secondary electron emission
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Projects
- 2 Finished
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HIGH SPEED IMAGING WITH DIAMOND DYNODE DETECTORS: A TECHNOLOGICAL ADVANCE WITH MAJOR COMMERCIAL APPLICATIONS
1/07/09 → 1/01/13
Project: Research
-
Profiles
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Professor Neil A Fox
- School of Chemistry - Professor of Materials for Energy
- Cabot Institute for the Environment
- The Bristol Centre for Nanoscience and Quantum Information
- Soft Matter, Colloids and Materials
- Materials for Energy
Person: Academic , Member