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

Y1 - 2008

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 -