Novel ion detector for fusion plasma diagnostics

Juha Kalliopuska, Francisco García, Marko Santala, Simo Eränen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

2 Citations (Scopus)


A novel thin silicon detector for the neutral particle analyzers (NPA) of the Joint European Torus (JET) is introduced for studying plasma characteristics during the fusion experiments. The new ion detector would replace the presently used very thin scintillator - photomultiplier tube combination. The proposed new NPA detector is based on direct conversion of charge in silicon and approximate matching of the detector thickness with the ranges of the observed ions. A thin silicon detector is only weakly sensitive to photon and neutron backgrounds but detects highly ionizing ions efficiently. Even high energy gammas deposit only little energy in the thin detector allowing effective background discrimination through pulse-height-analysis. Thin silicon strip detectors have been fabricated by using the silicon-on-insulator (SOI) technology. Fabricated detectors have 6 or 26 ìm thick high resistive silicon bonded on a conductive silicon support. The thinner detectors are designed to be used for the low energy NPA and the thicker ones for the high energy NPA. The presentation comprises a short introduction to the fabricated detector structures, TCAD simulations and results of the electrical and spectroscopic characterizations.
Original languageEnglish
Title of host publicationProceedings
Subtitle of host publicationIEEE Nuclear Science Symposium and Medical Imagine Conference, NSS-MIC 2007
Place of PublicationPiscataway, NJ, USA
PublisherIEEE Institute of Electrical and Electronic Engineers
ISBN (Print)978-1-4244-0922-8, 978-1-4244-0923-5
Publication statusPublished - 2007
MoE publication typeA4 Article in a conference publication
EventIEEE Nuclear Science Symposium and Medical Imagine Conference, NSS-MIC 2007 - Honolulu, HI, United States
Duration: 26 Oct 20073 Nov 2007


ConferenceIEEE Nuclear Science Symposium and Medical Imagine Conference, NSS-MIC 2007
Abbreviated titleNSS-MIC 2007
Country/TerritoryUnited States
CityHonolulu, HI


  • Neutral particle analyzer
  • silicon-on-insulator
  • silicon detectors
  • ion spectroscopy
  • electrical characterization
  • pulse-height-analysis


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