Control and monitoring system for fusion neutron spectroscopy on the Joint European Torus

Journal Article · Fri Oct 01 04:00:00 EDT 2004 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.1787934· OSTI ID:20636678

Tardocchi, M; Gorini, G; Palma, D; Sozzi, C; Kaellne, J; Conroy, S; Ericsson, G; Giacomelli, L; Glasser, W; Henriksson, H; Hjalmarsson, A; Ronchi, E; Sjoestrand, H; Weiszflog, M; Popovichev, S ^[1]

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1. INFM, Milano-Bicocca University, and Plasma Physics Institute, EURATOM-ENEA-CNR Association, Milan (Italy)

A new control and monitoring (C and M) system is being developed for the TOFOR and MPRu fusion neutron spectrometers within the Joint European Torus enhancement program. The system, which is an evolution of the existing C and M system of the MPR spectrometer, consists of a controlled pulsed light source distributed by an optical fiber network to all photomultiplier tubes used in the plastic scintillator based spectrometers. The light source is a green Nd:LSB solid-state laser complemented by blue light emitting diode sources. Pulse height distributions for each detection channel are recorded to set the spectrometers to prescribed working points and monitor deviations. Absolute reference is obtained complementing the controlled light source with radioactive sources. In this article we report on the C and M prototype design and component tests for the MPRu spectrometer. The results show that the laser and the associated optics provide a controlled light pulse of intensity covering a dynamic range of more than four orders of magnitude. The choice of optical fiber diameters is critical for achieving the desired stability and uniformity of the light intensity collected by each MPRu detector.

• OSTI ID: 20636678
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 75; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
LIGHT EMITTING DIODES
LIGHT SOURCES
NEUTRON SPECTROMETERS
NEUTRON SPECTROSCOPY
OPTICAL FIBERS
OPTICS
PHOTOMULTIPLIERS
PLASMA CONFINEMENT
PLASMA DIAGNOSTICS
SCINTILLATIONS
SOLID STATE LASERS
TOKAMAK DEVICES