A comparative analysis of the sensitivity of CsI (Tl), ZnO(Ga), and YAG(Ce) scintillators to the plasma background radiation under operating conditions of the ITER tokamak reactor

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

doi:10.1134/s0020441212020169

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…CsI(Tl) is thus the scintillator of choice for the ITER neutral particle analyzer. 12 The CsI(Tl) radiation resistance is also high, with a threshold for damage by 1.3 MeV γ s measured at ∼5 × 10 5 Gy. 13 For comparison the γ dose in a 100 μm thick CsI scintillator used in an ex-vessel camera would be several hundred Gy for the ITER lifetime.…”

Section: Application To the Burning Plasmamentioning

confidence: 99%

Multi-energy x-ray imaging and sensing for diagnostic and control of the burning plasma

Stutman

Tritz

Finkenthal

2012

Review of Scientific Instruments

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New diagnostic and sensor designs are needed for future burning plasma (BP) fusion experiments, having good space and time resolution and capable of prolonged operation in the harsh BP environment. We evaluate the potential of multi-energy x-ray imaging with filtered detector arrays for BP diagnostic and control. Experimental studies show that this simple and robust technique enables measuring with good accuracy, speed, and spatial resolution the T(e) profile, impurity content, and MHD activity in a tokamak. Applied to the BP this diagnostic could also serve for non-magnetic sensing of the plasma position, centroid, ELM, and RWM instability. BP compatible x-ray sensors are proposed using "optical array" or "bi-cell" detectors.

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Section: Application To the Burning Plasmamentioning

confidence: 99%

Multi-energy x-ray imaging and sensing for diagnostic and control of the burning plasma

Stutman

Tritz

Finkenthal

2012

Review of Scientific Instruments

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“…Calculations of the neutron fluxes in the location of the detectors of HENPA and LENPA were performed with use of the Monte Carlo N-Particle code. To convert these fluxes into the corresponding neutron noise induced in the NPA channels, the laboratory measurements of NPA detector sensitivity to the neutron radiation were used [21]. More details on the origin of the neutron noise in NPA detectors can be found in [22].…”

Section: Description Of Neutral Flux Numerical Modelmentioning

confidence: 99%

Assessment of neutral particle analysis abilities to measure the plasma hydrogen isotope composition in ITER burning scenarios

Afanasyev¹,

Mironov²,

Несеневич³

et al. 2013

Plasma Phys. Control. Fusion

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The main object of the neutral particle analysis (NPA) on ITER is to measure the hydrogen isotope composition of the plasma using measurements of the neutralized fluxes of the corresponding hydrogen ions. In burning scenarios the reliable on-line measurements of the tritium/deuterium (T/D) density ratio stands out as the most important application of the diagnostics. This paper presents the results of the error analysis of the NPA signals for 'official' ITER burning scenarios-inductive and steady state. The goal of the study is to find the range of values of T/D density ratio, where NPA measurements meet the ITER requirements specified for this parameter, i.e. 10% of accuracy and time resolution equal to 0.1 s. This analysis takes into account both the statistics of the particle counts detected by NPA and of the noise counts induced in NPA detectors by neutrons and gammas. The calibration errors and errors of the external plasma parameters, used in the interpretation of NPA data, are also accounted. The results of the study for low (20-200 keV) and high (200 keV-2 MeV) energy ranges of the D and T neutral fluxes are discussed. It was shown that in the inductive scenario NPA can provide the required accuracy of the T/D density ratio measurement if the plasma composition varies within 0.2-10 (edge measurements) and 0.15-10 (core measurements). In the steady-state scenario these ranges are 0.01-10 (edge measurements) and 0.07-7 (core measurements).

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“…From this point of view, ZnO film structures, with their increased transparency for NBEL, have an advantage over arrays of nano/microcrystals. The ability to reproducibly produce ZnO films of different thicknesses within a few micrometers contributes to the achievement of high spatial resolution and minimal sensitivity to background emission when detecting certain types of ionizing radiation, e.g., α-particles [39].…”

Section: Introductionmentioning

confidence: 99%

Effect of Plasma Treatment on the Luminescent and Scintillation Properties of Thick ZnO Films Fabricated by Sputtering of a Hot Ceramic Target

Tarasov,

Ismailov,

Gadzhiev

et al. 2023

Photonics

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The paper presents the results of a comprehensive study of the structural-phase composition, morphology, optical, luminescent, and scintillation characteristics of thick ZnO films fabricated by magnetron sputtering. By using a hot ceramic target, extremely rapid growth (~50 µm/h) of ZnO microfilms more than 100 µm thick was performed, which is an advantage for the industrial production of scintillation detectors. The effects of post-growth treatment of the fabricated films in low-temperature plasma were studied and a significant improvement in their crystalline and optical quality was shown. As a result, the films exhibit intense near-band-edge luminescence in the near-UV region with a decay time of <1 ns. Plasma treatment also allowed to significantly weaken the visible defect luminescence excited in the near-surface regions of the films. A study of the luminescence mechanisms in the synthesized films revealed that their near-band-edge emission at room temperature is formed by phonon replicas of free exciton recombination emission. Particularly, the first phonon replica plays the main role in the case of optical excitation, while upon X-ray excitation, the second phonon replica dominates. It was also shown that the green band peaking at ~510 nm (2.43 eV) is due to surface emission centers, while longer wavelength (>550 nm) green-yellow emission originates mainly from bulk parts of the films.

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A comparative analysis of the sensitivity of CsI (Tl), ZnO(Ga), and YAG(Ce) scintillators to the plasma background radiation under operating conditions of the ITER tokamak reactor

Cited by 6 publications

References 5 publications

Multi-energy x-ray imaging and sensing for diagnostic and control of the burning plasma

Multi-energy x-ray imaging and sensing for diagnostic and control of the burning plasma

Assessment of neutral particle analysis abilities to measure the plasma hydrogen isotope composition in ITER burning scenarios

Effect of Plasma Treatment on the Luminescent and Scintillation Properties of Thick ZnO Films Fabricated by Sputtering of a Hot Ceramic Target

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