Development of a Manufacturing Technology for Detectors of the Neutral Particle Diagnostic System on the Tokamak

Mel'nik, A.D.; Afanasyev, V. I.; Kozlovsky, S. S.; Mironov, M. I.; Navolotsky, A. S.; Несеневич, В. Г.; Петров, М. П.; Petrov, S. Ya.; Чернышев, Ф. В.

doi:10.1134/s0020441220020025

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…With the collimator and the neutron shield installed, the neutron flux at the location of the HENPA detector system during plasma discharges is estimated as ∼10 7 -10 8 cm −2 s −1 . Because of the above, the NPAs are equipped with a specially designed detector system that is radiation hard and has low sensitivity to the background (10 −6 -10 −7 pulse/neutron) [5,6]. To improve the signal-to-background ratio, the energy of secondary ions entering the LENPA analyzer is increased by 100 keV, which is achieved by installing an electrostatic accelerator in front of the analyzer (see figure 1).…”

Section: Jinst 17 C07001mentioning

confidence: 99%

Development of the NPA based diagnostic complex in ITER

et al. 2022

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The NPA based diagnostic complex in ITER consists of four diagnostics: the neutral particle analyzers, the diamond neutral particle spectrometer, the gamma-ray spectrometer, and the neutron spectrometer. The diagnostics are located in equatorial port #11 and share the same vacuum channel. The present paper considers the physical basis of the diagnostic complex and its measurement capabilities in ITER. In addition, the design of the complex and the engineering solutions implemented to meet the ITER requirements are described.

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Section: Jinst 17 C07001mentioning

confidence: 99%

Development of the NPA based diagnostic complex in ITER

et al. 2022

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Bench tests of a helium ion source for the neutral particle diagnostic system of the ITER tokamak

Melnik

Afanasyev

Давыденко

et al. 2020

Review of Scientific Instruments

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Bench tests of a 15 keV helium ion source, which has been developed for the neutral particle diagnostic system of the International Thermonuclear Experimental Reactor (ITER), are described. Being part of the diagnostic system, the ion source will be used to monitor the intactness of carbon stripping foils as well as to check the detection and dispersion systems of the main diagnostic instruments—neutral particle analyzers (NPAs). The ion source produces a wide 5-cm diameter (FWHM) ion beam at a distance of about 50 cm; the ion beam uniformity at a 2-cm area corresponding to the size of the stripping foil is not worse than 10%. The beam current over the area of the stripping foil can be adjusted in the range of 0.1 pA–1 pA. After initial heating, the temporal stability of the ion beam is better than 10%. Pulse height measurements of registered signals show that 15 keV He+ ions can be reliably registered by the NPA detector system. The obtained results allow us to conclude that the developed ion source can provide a reliable check of the NPA system during the diagnostic performance on the ITER tokamak.

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Development and testing of secondary ion accelerator for ITER neutral particle diagnostic system

Afanasyev,

Chernyshev,

Kozlovsky

et al. 2023

Review of Scientific Instruments

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This paper presents the results of the development and testing of a secondary ion accelerator for the diagnostic complex of neutral particle analyzers at ITER. The accelerator is part of an analyzer designed to measure fluxes of neutral deuterium and tritium particles escaping from reactor plasma in a total range of 10–200 keV. The aim of the accelerator is to improve the signal/background ratio of the analyzer. It is especially important for the region with a relatively low energy of 10–50 keV. The accelerator has the function of converting atoms into secondary ions and accelerating them in an electrostatic field with a voltage of up to +100 kV. The accelerator is based on two high-voltage accelerating tubes. A special unit is built into the central electrode of the accelerator, which provides the replacement of stripping foils used for the conversion of the flux of neutral particles into a flux of secondary ions. The high-voltage tube assembly is encompassed by a sealed steel housing, in which electrical insulation is provided by a gas gap (nitrogen at 6 bar). The results of tests of the accelerator under ITER relevant conditions, namely, under high-intensity gamma irradiation and seismic loads, have shown its high reliability for use in the diagnostic complex of the fusion reactor.

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Development of a Manufacturing Technology for Detectors of the Neutral Particle Diagnostic System on the Tokamak

Cited by 3 publications

References 6 publications

Development of the NPA based diagnostic complex in ITER

Development of the NPA based diagnostic complex in ITER

Bench tests of a helium ion source for the neutral particle diagnostic system of the ITER tokamak

Development and testing of secondary ion accelerator for ITER neutral particle diagnostic system

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