Round-robin irradiation test of radiation resistant optical fibers for ITER diagnostic application

Kakuta, T.; Shikama, Tatsuo; Nishitani, T.; Brichard, B.; Krassilinikov, A.; Томашук, А.Л.; Yamamoto, Shuji; Kasai, S.

doi:10.1016/s0022-3115(02)01277-1

Cited by 51 publications

(27 citation statements)

References 6 publications

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“…The alpha particle losses onto the first wall surface create neutrons and ␥-rays due to the 9 Be͑␣ , n␥͒ 12 C reaction, because the ITER first wall is made of beryllium metal. The ␥-ray detection may allow us to measure the alpha particle losses onto the first walls.…”

Section: Lost Alpha "Ion… Induced Gamma Ray Spectroscopymentioning

confidence: 99%

“…The ␥-ray detection may allow us to measure the alpha particle losses onto the first walls. The 4.44 MeV ␥-rays from the 9 Be͑␣ , n␥͒ 12 C reaction must be discriminated from the background ␥-rays and neutrons originating from DT plasmas, vacuum vessel, and first walls. Even in the deuterium deuterium ͑DD͒ discharge, the 3.1 MeV ␥-rays from the reaction 12 C͑d , p␥͒ 13 C is possible.…”

Section: Lost Alpha "Ion… Induced Gamma Ray Spectroscopymentioning

confidence: 99%

“…The Am-Be source produces 4.4 MeV ␥-rays as well as neutrons from the 9 Be͑␣ , n␥͒ 12 C reaction, and it emits the neutrons of 2.3ϫ 10 4 n / s and ␥-rays of 1.4ϫ 10 4 ␥ / s. The spectrum of high-energy ␥-rays is obtained by a pulse height analysis. The 0.1 mol % Ce:LSO scintillator ͑10ϫ 10 ϫ 20 mm͒ is selected because of the inclusion of the heavy element.…”

Section: Labotatory Test Of Lost Alpha "Ion…-induced ␥-Ray Specmentioning

confidence: 99%

“…A second new system is based on the 9 Be͑␣ , n␥͒ 12 C reaction at first wall, which is applied to the alpha particle induced ␥-ray detection. 4,5 The energy resolution of Ce doped Lu 2 SiO 5 ͑Ce:LSO͒ ͑Ref.…”

Section: Introductionmentioning

confidence: 99%

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Development and irradiation test of lost alpha detection system for ITER

Nishiura

Nagasaka

Fujioka

et al. 2010

Review of Scientific Instruments

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We developed a lost alpha detection system to use in burning plasma experiments. The scintillators of Ag:ZnS and polycrystalline Ce:YAG were designed for a high-temperature environment, and the optical transmission line was designed to transmit from the scintillator to the port plug. The required optical components of lenses and mirrors were irradiated using the fission reactor with the initial result that there was no clear change after the irradiation with a neutron flux of 9.6 ϫ 10 17 nm −2 s −1 for 48 h. We propose a diagnostic of alpha particle loss, so-called alpha particle induced gamma ray spectroscopy. The initial laboratory test has been carried out by the use of the Ce doped Lu 2 SiO 5 scintillator detector and an Am-Be source to detect the 4.44 MeV high energy gamma ray due to the 9 Be͑␣ , n␥͒ 12 C reaction.

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Section: Lost Alpha "Ion… Induced Gamma Ray Spectroscopymentioning

confidence: 99%

Section: Lost Alpha "Ion… Induced Gamma Ray Spectroscopymentioning

confidence: 99%

Section: Labotatory Test Of Lost Alpha "Ion…-induced ␥-Ray Specmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development and irradiation test of lost alpha detection system for ITER

Nishiura

Nagasaka

Fujioka

et al. 2010

Review of Scientific Instruments

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“…Transmissivity losses with chromatic dependence in optical components such as lenses, mirrors and fibers, caused by intense radiation (γ-ray and neutron) from fusion plasmas, are serious concerns [1,2]. Another problem for light measurement is caused by thin films on vacuum windows that can be seen after many plasma discharges and also have chromatic dependence in their transmissivity [3].…”

mentioning

confidence: 99%

An in-situ Relative Calibration Method for Thomson Scattering Diagnostics Using a Double-Pass Scattering System

Tojo

Hatae

Itami

2011

Plasma and Fusion Research

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A new method of in-situ relative calibration for Thomson scattering diagnostics using a double-pass scattering system is proposed. The ratio of scattered light signals between the first and second pass depends on electron temperature (T e ), making it possible to evaluate T e without considering relative transmissivities. The relative transmissivities of each spectral channel can be determined at the same time. The feasibility of the method based on parameters in a JT-60SA Thomson scattering diagnostic is also examined.

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Influence of Self‐Trapped Holes on the Responses of Fluorine‐Doped Multimode Optical Fibers Exposed to Low Fluences of Protons

Girard

Paillet

Trinzcek

et al. 2018

Physica Status Solidi (a)

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The radiation vulnerability of various classes of multimode silica‐based optical fibers is investigated for space applications operating from the ultraviolet up to near‐infrared spectral domains. For this, radiation‐induced attenuation (RIA) levels and kinetics in the 300 ÷ 1100 nm wavelength range are monitored during and after steady state 105 MeV proton exposure at room temperature (RT, equivalent dose of ∼250 Gy(SiO2)). The responses of three types of “radiation hardened” optical fibers with either a pure‐silica core (PSC) or fluorine‐doped cores are compared to the one of a Telecom‐grade germanosilicate optical fiber. RIA growth during irradiation and decay after irradiation (recovery phase) reveal that the highly fluorine (2 wt.%)‐doped optical fiber, manufactured by axial vapor deposition process, presents higher RIA levels above 600 nm than other tested optical fibers. Indeed, if the high F‐doping level reduces the UV‐RIA related to SiE’, NBOHC or chlorine‐related centers this composition appears as associated with a strong RIA increase in the visible‐near‐IR through the more efficient generation of RT unstable strain‐assisted or inherent self‐trapped holes.

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Round-robin irradiation test of radiation resistant optical fibers for ITER diagnostic application

Cited by 51 publications

References 6 publications

Development and irradiation test of lost alpha detection system for ITER

Development and irradiation test of lost alpha detection system for ITER

An in-situ Relative Calibration Method for Thomson Scattering Diagnostics Using a Double-Pass Scattering System

Influence of Self‐Trapped Holes on the Responses of Fluorine‐Doped Multimode Optical Fibers Exposed to Low Fluences of Protons

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