Divertor impurity monitor for the International Thermonuclear Experimental Reactor

Sugie, Toshiharu; Ogawa, Hideyuki; Nishitani, T.; Kasai, S.; Katsunuma, Jun; Maruo, Mitsumasa; Ebisawa, K.; Ando, T.; Kita, Yoshio

doi:10.1063/1.1149340

Cited by 16 publications

(9 citation statements)

References 11 publications

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“…Line intensities were calculated for a range of T e and n e , and divertor particle flux rates expected in ITER. 29 The conclusion for NIR line intensities is similar to the UV-VIS situation: 29 difficulties may be encountered at very high electron densities, where bremstrahlung and free-bound emission become appreciable, and at low recycling and impurity influx levels, where line intensities become low.…”

Section: Emission Intensity Estimatesmentioning

confidence: 70%

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Near-infrared spectroscopy for burning plasma diagnostic applications

Soukhanovskii

2008

Review of Scientific Instruments

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Ultraviolet and visible (UV-VIS, 200-750 nm) atomic spectroscopy of neutral and ionized fuel species (H, D, T, and Li) and impurities (e.g., He, Be, C, and W) is a key element of plasma control and diagnosis on International Thermonuclear Experimental Reactor and future magnetically confined burning plasma experiments (BPXs). Spectroscopic diagnostic implementation and performance issues that arise in the BPX harsh nuclear environment in the UV-VIS range, e.g., degradation of first mirror reflectivity under charge-exchange atom bombardment (erosion) and impurity deposition, permanent and dynamic loss of window, and optical fiber transmission under intense neutron and gamma-ray fluxes, are either absent or not as severe in the near-infrared (NIR, 750-2000 nm) range. An initial survey of NIR diagnostic applications has been undertaken on the National Spherical Torus Experiment. It is demonstrated that NIR spectroscopy can be used for machine protection and plasma control applications, as well as contribute to plasma performance evaluation and physics studies. Emission intensity estimates demonstrate that NIR measurements are possible in the BPX plasma operating parameter range. Complications in the NIR range due to the parasitic background emissions are expected to occur at very high plasma densities, low impurity densities, and at high plasma-facing component temperatures.

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Section: Emission Intensity Estimatesmentioning

confidence: 70%

“…These calculations follow the methodology of Ref. 29 where a design for the ITER divertor impurity monitor was evaluated. Line intensities were calculated for a range of T e and n e , and divertor particle flux rates expected in ITER.…”

Section: Emission Intensity Estimatesmentioning

confidence: 99%

Near-infrared spectroscopy for burning plasma diagnostic applications

Soukhanovskii

2008

Review of Scientific Instruments

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“…358 In the region of 200-500 nm, the reflectivity of Mo is better than that of Cu and W and the sputtering yield for deuterium is relatively low. 359,360 Thus, Mo appears to be a good choice for a first mirror in the ITER divertor cassette. Neutral particle bombardment of the first mirror can also degrade the performance.…”

Section: Mirrors and Lensesmentioning

confidence: 99%

Passive Spectroscopic Diagnostics for Magnetically-confined Fusion Plasmas

Stratton¹,

Bitter²,

Hill³

et al. 2007

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Spectroscopy of radiation emitted by impurities and hydrogen isotopes plays an important role in the study of magnetically-confined fusion plasmas, both in determining the effects of impurities on plasma behavior and in measurements of plasma parameters such as electron and ion temperatures and densities, particle transport, and particle influx rates. This paper reviews spectroscopic diagnostics of plasma radiation that are excited by collisional processes in the plasma, which are termed 'passive' spectroscopic diagnostics to distinguish them from 'active' spectroscopic diagnostics involving injected particle and laser beams. A brief overview of the ionization balance in hot plasmas and the relevant line and continuum radiation excitation mechanisms is given. Instrumentation in the soft X-ray, vacuum ultraviolet, ultraviolet, visible, and near-infrared regions of the spectrum is described and examples of measurements are given.Paths for further development of these measurements and issues for their implementation in a burning plasma environment are discussed.

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“…The harsh conditions (high temperature, high magnetic field, high vacuum condition and high radiation field) require that special provisions be taken to ensure the accuracy and full functionality of diagnostic components. Beginning in the CDA phase the ITER international team and the Japan Home Team (Japan Participant Team) collaborated in the design of the Impurity Influx Monitor (divertor) [3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%