Neutron irradiation tests on diagnostic components at JAERI

Nishitani, T.; Shikama, Tatsuo; Fukao, M.; Reichle, R.; Sugie, Toshiharu; Kakuta, T.; Kasai, S.; Snider, R. T.; Yamamoto, Shuji

doi:10.1016/s0920-3796(01)00375-1

Cited by 19 publications

(15 citation statements)

References 8 publications

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“…In recent years there has been an increasing research focus on service performance of sapphire crystal for aerospace optical application [3][4][5][6][7], so it is indispensable for knowledge of its service performance under various space-radiation environments [8,9], being known its radiation resistance. Extensive studies were carried out in the last years in the field of highenergy fast neutron radiation of sapphire crystal for selecting a good candidate material of diagnostic window in fusion reactor systems [10,11].…”

Section: Introductionmentioning

confidence: 99%

Radiation resistance of synthetic sapphire crystal irradiated by low‐energy neutron flux

Wang¹,

Han²,

Zhang³

et al. 2009

Cryst. Res. Technol.

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In this paper, high‐quality sapphire crystal grown by an improved Kyropoulos‐like method, was irradiated by low‐energy neutron (i.e. high proportion of thermal neutron) with various flux (low: 7.5×1015 n/cm2, medium: 7.0×1016 n/cm2 and high: 3.8×1017 n/cm2). The characteristic features of neutron fluence dependence of radiation‐defect formation process, mainly including its change of the structural and optical properties prior to and after irradiation, were investigated by optical absorption (OA), photoluminescence (PL), electron paramagnetic resonance (EPR) and positron annihilation spectroscopy (PAS). It is found that sapphire crystal exhibits high radiation resistance to low‐energy neutron with low fluence. But with the increase of irradiation fluence, it is still sensitive to neutron irradiation mostly in the UV‐visible spectral range, as irradiation‐induced color centers appear, including F‐type and their aggregate centers. Finally, the formation mechanism of the irradiation defects is also discussed. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Introductionmentioning

confidence: 99%

Radiation resistance of synthetic sapphire crystal irradiated by low‐energy neutron flux

Wang¹,

Han²,

Zhang³

et al. 2009

Cryst. Res. Technol.

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“…Magnetic coils wound with mineral insulated (MI) cable are proposed as the most reliable magnetic sensors in ITER [1]. However, radiation-induced EMF (RIEMF) of order 1V was observed between the center conductor and the outer sheath under fission reactor irradiation tests [2][3][4][5]. Should more than a small fraction (10 À6 ) of this RIEMF appear across the center conductor (as the signal voltage does), significant errors will be induced into the plasma position measurements.…”

Section: Introductionmentioning

confidence: 99%

Radiation-induced thermoelectric sensitivity in the mineral-insulated cable of magnetic diagnostic coils for ITER

Nishitani

Vayakis²,

Yamauchi

et al. 2004

Journal of Nuclear Materials

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“…As a result, materials perish and swell, and window transmission is degrading. In addition radiation induced luminescence occurs permitting the use of silica based optical components near to the plasma completely [11,57,172,173]. While stainless steel can withstand more than 1 dpa and 10 9 Gy, insulators are far more affected becoming useless at orders of magnitude lower doses [10].…”

Section: Radiation Effects In Burning Plasma Experimentsmentioning

confidence: 99%

“…The main difference to the former is that the induced degradation builds up and is conserved depending on the total fluence applied. The degradation of the insulating properties occurs for dose rates of about 10 Radiation induced electromagnetic forces is the generation of spurious currents, which can lead to error signals in the measurement [57,[285][286][287][288][289]. The currents can create voltages between the core and the sheath of a coax cable depending on the insulation resistance of the cable and its external load.…”

Section: Cablesmentioning

confidence: 99%

Diagnostics for steady state plasmas

Hartfuß¹,

König²,

Werner³

2006

Plasma Phys. Control. Fusion

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Problems related to the development of diagnostics for steady state fusion plasma experiments are being discussed. The paper concentrates on those necessities already appearing in nowadays non-burning plasma fusion experiments when extending pulse lengths beyond 10 s, i.e. thermal load, erosion, deposition, and long-time signal integration in magnetic diagnostics. Problems arising from high power ECRH under conditions of incomplete absorption are outlined. Individual standard diagnostic systems are discussed to identify their specific problems as well as the opportunities connected with long pulse operation. Burning plasma experiments characterized by intense n-and g-radiation are briefly reviewed for reasons of completeness, dealing with radiation induced processes in windows, fibres, cables, and mirrors. Methods of data handling, real time monitoring, and plasma control are outlined. Index

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Neutron irradiation tests on diagnostic components at JAERI

Cited by 19 publications

References 8 publications

Radiation resistance of synthetic sapphire crystal irradiated by low‐energy neutron flux

Radiation resistance of synthetic sapphire crystal irradiated by low‐energy neutron flux

Radiation-induced thermoelectric sensitivity in the mineral-insulated cable of magnetic diagnostic coils for ITER

Diagnostics for steady state plasmas

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