Measurements of 2D poloidal plasma profiles and fluctuations in ECRH plasmas using the heavy ion beam probe system in the TJ-II stellarator
| Autor: | J.L. de Pablos, L. I. Krupnik, N. K. Kharchev, A. Molinero, A. Malaquias, L.G. Eliseev, V. N. Zenin, C. Hidalgo, A.V. Melnikov, T. Estrada, A. Cappa, I. Pastor, P.O. Khabanov, B. van Milligen, A.S. Kozachek, R. Sharma, A.A. Chmyga |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Density gradient Ion current Plasma Condensed Matter Physics 01 natural sciences Particle transport Electron cyclotron resonance 010305 fluids & plasmas law.invention Heavy ion beam Physics::Plasma Physics law Contour line Physics::Space Physics 0103 physical sciences Atomic physics 010306 general physics Stellarator |
| Zdroj: | Physics of Plasmas |
| ISSN: | 1089-7674 1070-664X |
| DOI: | 10.1063/1.5142996 |
| Popis: | 2D poloidal contour plots of plasma potential, plasma density, and their fluctuations have been measured in low density plasmas sustained by Electron Cyclotron Resonance Heating using a heavy ion beam probe (HIBP) system in the TJ-II stellarator. A HIBP has been used in the new energy scanning mode to obtain the measurements for a 2D poloidal cross section of the stellarator. The 2D map for the absolute plasma potential shows a local maximum in the plasma core as expected in low density plasma scenarios. Fluctuations in the HIBP secondary ion current, as a proxy of plasma density fluctuations, appear both in positive and negative density gradient regions, with a normalized level of density fluctuations higher in the negative density gradient region. The TJ-II innovative experimental setup developed using a dual HIBP diagnostic paves the way for model validation on core plasma potential asymmetries and particle transport and fluctuations under positive and negative density gradient scenarios. |
| Databáze: | OpenAIRE |
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