Exploration of ion temperature profile measurements at JET using the upgraded neutron profile monitor

Journal Article · Mon Oct 15 00:00:00 EDT 2012 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4734040· OSTI ID:22093810

Marocco, D.; Esposito, B.; Riva, M. ^[1]

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1. Associazione EURATOM-ENEA sulla Fusione, C.R. Frascati, C.P. 65, Frascati I-00044, Roma (Italy)

The neutron profile monitor (NPM), routinely used at the Joint European Torus for neutron emissivity profile measurements, consists of two fan-shaped arrays of collimators and each line of sight (LOS) is equipped with a NE213 liquid organic scintillator for simultaneous measurements of the 2.5 MeV and 14 MeV neutrons. A digital system developed in ENEA has replaced the analog acquisition electronics and now enables the NPM to perform spatially resolved neutron spectrometry by providing neutron pulse height spectra (PHS) for each LOS. However, the NPM was not originally designed as a spectrometer and, therefore, lacks several key features, such as detailed measurements of the detector response functions and the presence of detector stability monitors. We present a proof of principle of ion temperature profile measurements derived from the NPM PHS in high plasma current discharges using simulated detector response functions.

• OSTI ID: 22093810
• Journal Information: Review of Scientific Instruments, Vol. 83, Issue 10; Other Information: (c) 2012 Euratom; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
COLLIMATORS
DIGITAL SYSTEMS
ELECTRIC DISCHARGES
ELECTRON TEMPERATURE
EMISSIVITY
EXPLORATION
ION TEMPERATURE
JET TOKAMAK
LIQUID SCINTILLATION DETECTORS
MEV RANGE
NEUTRON DETECTION
NEUTRON SPECTROMETERS
NEUTRON SPECTROSCOPY
PLASMA DIAGNOSTICS
PULSES
RESPONSE FUNCTIONS
SIMULATION
SPECTRA
STABILITY