A novel silicon detector for neutral particle analysis in JET fusion research

Juha Kalliopuska (Corresponding Author), Francisco García, Marko Santala, Simo Eränen, Tuula Virolainen, Seppo Karttunen, Tomi Kovero, Tapani Vehmas, Risto Orava

    Research output: Contribution to journalArticleScientificpeer-review

    7 Citations (Scopus)

    Abstract

    A novel detector for the neutral particle analyzers (NPA) of the Joint European Torus (JET) is introduced for studying plasma characteristics during the fusion experiments. The proposed ion detector for the NPA would replace the presently used very thin scintillator–photomultiplier tube combination. The scintillator detectors exhibit poor energy resolution, their non-linearity precludes ion identification and their sensitivity to background makes signal-to-background separation difficult under the severe radiation background present during JET plasma pulses. 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 particles. The light ions of interest to the NPA have ranges that vary from less than 1 to 25 μm. 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 a little energy in the thin detector allowing effective background discrimination through the pulse-height analysis. Thin silicon strip detectors have been fabricated by using the silicon-on-insulator (SOI) technology. Fabricated detectors have 6 or 26 μm 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 paper comprises an introduction of the fabricated detector structures, results of the preliminary electrical characterization and the first spectroscopic measurements.

    Original languageEnglish
    Pages (from-to)92 - 97
    Number of pages6
    JournalNuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
    Volume591
    Issue number1
    DOIs
    Publication statusPublished - 2008
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Joint European Torus
    Silicon detectors
    neutral particles
    Fusion reactions
    fusion
    Detectors
    detectors
    silicon
    analyzers
    Silicon
    Ions
    Silicon on insulator technology
    energy
    Plasmas
    ions
    light ions
    background radiation
    pulse amplitude
    Phosphors
    scintillation counters

    Keywords

    • neutral particle analyzer
    • silicon-on-insulator
    • silicon detectors
    • ion spectroscopy
    • electrical characterization

    Cite this

    Kalliopuska, Juha ; García, Francisco ; Santala, Marko ; Eränen, Simo ; Virolainen, Tuula ; Karttunen, Seppo ; Kovero, Tomi ; Vehmas, Tapani ; Orava, Risto. / A novel silicon detector for neutral particle analysis in JET fusion research. In: Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2008 ; Vol. 591, No. 1. pp. 92 - 97.
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    abstract = "A novel detector for the neutral particle analyzers (NPA) of the Joint European Torus (JET) is introduced for studying plasma characteristics during the fusion experiments. The proposed ion detector for the NPA would replace the presently used very thin scintillator–photomultiplier tube combination. The scintillator detectors exhibit poor energy resolution, their non-linearity precludes ion identification and their sensitivity to background makes signal-to-background separation difficult under the severe radiation background present during JET plasma pulses. 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 particles. The light ions of interest to the NPA have ranges that vary from less than 1 to 25 μm. 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 a little energy in the thin detector allowing effective background discrimination through the pulse-height analysis. Thin silicon strip detectors have been fabricated by using the silicon-on-insulator (SOI) technology. Fabricated detectors have 6 or 26 μm 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 paper comprises an introduction of the fabricated detector structures, results of the preliminary electrical characterization and the first spectroscopic measurements.",
    keywords = "neutral particle analyzer, silicon-on-insulator, silicon detectors, ion spectroscopy, electrical characterization",
    author = "Juha Kalliopuska and Francisco Garc{\'i}a and Marko Santala and Simo Er{\"a}nen and Tuula Virolainen and Seppo Karttunen and Tomi Kovero and Tapani Vehmas and Risto Orava",
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    A novel silicon detector for neutral particle analysis in JET fusion research. / Kalliopuska, Juha (Corresponding Author); García, Francisco; Santala, Marko; Eränen, Simo; Virolainen, Tuula; Karttunen, Seppo; Kovero, Tomi; Vehmas, Tapani; Orava, Risto.

    In: Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 591, No. 1, 2008, p. 92 - 97.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - A novel silicon detector for neutral particle analysis in JET fusion research

    AU - Kalliopuska, Juha

    AU - García, Francisco

    AU - Santala, Marko

    AU - Eränen, Simo

    AU - Virolainen, Tuula

    AU - Karttunen, Seppo

    AU - Kovero, Tomi

    AU - Vehmas, Tapani

    AU - Orava, Risto

    N1 - Project code: 12679

    PY - 2008

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    N2 - A novel detector for the neutral particle analyzers (NPA) of the Joint European Torus (JET) is introduced for studying plasma characteristics during the fusion experiments. The proposed ion detector for the NPA would replace the presently used very thin scintillator–photomultiplier tube combination. The scintillator detectors exhibit poor energy resolution, their non-linearity precludes ion identification and their sensitivity to background makes signal-to-background separation difficult under the severe radiation background present during JET plasma pulses. 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 particles. The light ions of interest to the NPA have ranges that vary from less than 1 to 25 μm. 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 a little energy in the thin detector allowing effective background discrimination through the pulse-height analysis. Thin silicon strip detectors have been fabricated by using the silicon-on-insulator (SOI) technology. Fabricated detectors have 6 or 26 μm 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 paper comprises an introduction of the fabricated detector structures, results of the preliminary electrical characterization and the first spectroscopic measurements.

    AB - A novel detector for the neutral particle analyzers (NPA) of the Joint European Torus (JET) is introduced for studying plasma characteristics during the fusion experiments. The proposed ion detector for the NPA would replace the presently used very thin scintillator–photomultiplier tube combination. The scintillator detectors exhibit poor energy resolution, their non-linearity precludes ion identification and their sensitivity to background makes signal-to-background separation difficult under the severe radiation background present during JET plasma pulses. 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 particles. The light ions of interest to the NPA have ranges that vary from less than 1 to 25 μm. 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 a little energy in the thin detector allowing effective background discrimination through the pulse-height analysis. Thin silicon strip detectors have been fabricated by using the silicon-on-insulator (SOI) technology. Fabricated detectors have 6 or 26 μm 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 paper comprises an introduction of the fabricated detector structures, results of the preliminary electrical characterization and the first spectroscopic measurements.

    KW - neutral particle analyzer

    KW - silicon-on-insulator

    KW - silicon detectors

    KW - ion spectroscopy

    KW - electrical characterization

    U2 - 10.1016/j.nima.2008.03.030

    DO - 10.1016/j.nima.2008.03.030

    M3 - Article

    VL - 591

    SP - 92

    EP - 97

    JO - Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

    JF - Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

    SN - 0168-9002

    IS - 1

    ER -