The influence of impurities on limiter tokamak plasmas and relevant mechanisms

M. Z. Tokar; T. Baelmans; V. Philipps; D. Reiter; U. Samm; B. Unterberg; H. A. Classen; H. Gerhauser; J. D. Hey; A. Huber; P. Mertens; Y. T. Lie; J. Ongena; A. Pospieszczyk; T. Putz; J. Rapp; D. Rusbuld; R. P. Schorn; B. Schweer

doi:10.1088/0741-3335/37/11A/016

The influence of impurities on limiter tokamak plasmas and relevant mechanisms

M. Z. Tokar, T. Baelmans, V. Philipps, D. Reiter, U. Samm, B. Unterberg, H. A. Classen, H. Gerhauser, J. D. Hey, A. Huber, P. Mertens, Y. T. Lie, J. Ongena, A. Pospieszczyk, T. Putz, J. Rapp, D. Rusbuld, R. P. Schorn, B. Schweer

Fusion Energy Division

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Abstract

The paper gives a survey on recent experimental and theoretical investigations on the tokamak TEXTOR concerning the influence of impurities on the plasma behaviour. A broad spectrum of diagnostics allows the measurements of the spatial distributions of densities, temperatures and radiation of impurity and background particles. The plasma density critical for development of the radiative instability observed in the core of ohmically heated plasmas in discharges with high-Z limiters is estimated on the basis of a simple analytical model. The results of modelling by the code RITM of plasmas polluted by low-Z impurities are presented. An interpretation of different stability of OH and additionally heated plasmas to detachment, of improvement of energy confinement with neon seeding is proposed. The importance of impurities in the plasma dynamics in the vicinity of strong sources of impurities through their influence on the electric field is discussed.

Original language	English
Article number	016
Pages (from-to)	A241-A253
Journal	Plasma Physics and Controlled Fusion
Volume	37
Issue number	11A
DOIs	https://doi.org/10.1088/0741-3335/37/11A/016
State	Published - 1995

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Tokar, M. Z., Baelmans, T., Philipps, V., Reiter, D., Samm, U., Unterberg, B., Classen, H. A., Gerhauser, H., Hey, J. D., Huber, A., Mertens, P., Lie, Y. T., Ongena, J., Pospieszczyk, A., Putz, T., Rapp, J., Rusbuld, D., Schorn, R. P., & Schweer, B. (1995). The influence of impurities on limiter tokamak plasmas and relevant mechanisms. Plasma Physics and Controlled Fusion, 37(11A), A241-A253. Article 016. https://doi.org/10.1088/0741-3335/37/11A/016

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title = "The influence of impurities on limiter tokamak plasmas and relevant mechanisms",

abstract = "The paper gives a survey on recent experimental and theoretical investigations on the tokamak TEXTOR concerning the influence of impurities on the plasma behaviour. A broad spectrum of diagnostics allows the measurements of the spatial distributions of densities, temperatures and radiation of impurity and background particles. The plasma density critical for development of the radiative instability observed in the core of ohmically heated plasmas in discharges with high-Z limiters is estimated on the basis of a simple analytical model. The results of modelling by the code RITM of plasmas polluted by low-Z impurities are presented. An interpretation of different stability of OH and additionally heated plasmas to detachment, of improvement of energy confinement with neon seeding is proposed. The importance of impurities in the plasma dynamics in the vicinity of strong sources of impurities through their influence on the electric field is discussed.",

author = "Tokar, {M. Z.} and T. Baelmans and V. Philipps and D. Reiter and U. Samm and B. Unterberg and Classen, {H. A.} and H. Gerhauser and Hey, {J. D.} and A. Huber and P. Mertens and Lie, {Y. T.} and J. Ongena and A. Pospieszczyk and T. Putz and J. Rapp and D. Rusbuld and Schorn, {R. P.} and B. Schweer",

year = "1995",

doi = "10.1088/0741-3335/37/11A/016",

language = "English",

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pages = "A241--A253",

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Tokar, MZ, Baelmans, T, Philipps, V, Reiter, D, Samm, U, Unterberg, B, Classen, HA, Gerhauser, H, Hey, JD, Huber, A, Mertens, P, Lie, YT, Ongena, J, Pospieszczyk, A, Putz, T, Rapp, J, Rusbuld, D, Schorn, RP & Schweer, B 1995, 'The influence of impurities on limiter tokamak plasmas and relevant mechanisms', Plasma Physics and Controlled Fusion, vol. 37, no. 11A, 016, pp. A241-A253. https://doi.org/10.1088/0741-3335/37/11A/016

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T1 - The influence of impurities on limiter tokamak plasmas and relevant mechanisms

AU - Tokar, M. Z.

AU - Baelmans, T.

AU - Philipps, V.

AU - Reiter, D.

AU - Samm, U.

AU - Unterberg, B.

AU - Classen, H. A.

AU - Gerhauser, H.

AU - Hey, J. D.

AU - Huber, A.

AU - Mertens, P.

AU - Lie, Y. T.

AU - Ongena, J.

AU - Pospieszczyk, A.

AU - Putz, T.

AU - Rapp, J.

AU - Rusbuld, D.

AU - Schorn, R. P.

AU - Schweer, B.

PY - 1995

Y1 - 1995

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AB - The paper gives a survey on recent experimental and theoretical investigations on the tokamak TEXTOR concerning the influence of impurities on the plasma behaviour. A broad spectrum of diagnostics allows the measurements of the spatial distributions of densities, temperatures and radiation of impurity and background particles. The plasma density critical for development of the radiative instability observed in the core of ohmically heated plasmas in discharges with high-Z limiters is estimated on the basis of a simple analytical model. The results of modelling by the code RITM of plasmas polluted by low-Z impurities are presented. An interpretation of different stability of OH and additionally heated plasmas to detachment, of improvement of energy confinement with neon seeding is proposed. The importance of impurities in the plasma dynamics in the vicinity of strong sources of impurities through their influence on the electric field is discussed.

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The influence of impurities on limiter tokamak plasmas and relevant mechanisms

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