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.
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June 2020
Research Article|
June 01 2020
Measurements of 2D poloidal plasma profiles and fluctuations in ECRH plasmas using the heavy ion beam probe system in the TJ-II stellarator
R. Sharma
;
R. Sharma
a)
1
IPFN, Instituto Superior Técnico, Universidade de Lisboa
, 1049-001 Lisboa, Portugal
a)Author to whom correspondence should be addressed: [email protected]
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P. O. Khabanov;
P. O. Khabanov
2
National Research Centre “Kurchatov Institute
,” 123182 Moscow, Russia
3
Moscow Institute of Physics and Technology
, 141700 Dolgoprudny, Russia
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A. V. Melnikov;
A. V. Melnikov
2
National Research Centre “Kurchatov Institute
,” 123182 Moscow, Russia
3
Moscow Institute of Physics and Technology
, 141700 Dolgoprudny, Russia
4
National Research Nuclear University MEPhI
, 115409 Moscow, Russia
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C. Hidalgo;
C. Hidalgo
5
Fusion National Laboratory, CIEMAT
, 28040 Madrid, Spain
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A. Cappa
;
A. Cappa
5
Fusion National Laboratory, CIEMAT
, 28040 Madrid, Spain
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A. Chmyga;
A. Chmyga
6
Institute of Plasma Physics, NSC KIPT
, 61108 Kharkov, Ukraine
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L. G. Eliseev;
L. G. Eliseev
2
National Research Centre “Kurchatov Institute
,” 123182 Moscow, Russia
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T. Estrada
;
T. Estrada
5
Fusion National Laboratory, CIEMAT
, 28040 Madrid, Spain
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N. K. Kharchev
;
N. K. Kharchev
2
National Research Centre “Kurchatov Institute
,” 123182 Moscow, Russia
7
Prokhorov General Physics Institute of the Russian Academy of Sciences
, 117942 Moscow, Russia
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A. S. Kozachek;
A. S. Kozachek
6
Institute of Plasma Physics, NSC KIPT
, 61108 Kharkov, Ukraine
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L. I. Krupnik;
L. I. Krupnik
6
Institute of Plasma Physics, NSC KIPT
, 61108 Kharkov, Ukraine
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A. Malaquias
;
A. Malaquias
1
IPFN, Instituto Superior Técnico, Universidade de Lisboa
, 1049-001 Lisboa, Portugal
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B. van Milligen
;
B. van Milligen
5
Fusion National Laboratory, CIEMAT
, 28040 Madrid, Spain
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A. Molinero;
A. Molinero
5
Fusion National Laboratory, CIEMAT
, 28040 Madrid, Spain
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J. L. de Pablos;
J. L. de Pablos
5
Fusion National Laboratory, CIEMAT
, 28040 Madrid, Spain
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I. Pastor;
I. Pastor
5
Fusion National Laboratory, CIEMAT
, 28040 Madrid, Spain
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V. N. Zenin
V. N. Zenin
2
National Research Centre “Kurchatov Institute
,” 123182 Moscow, Russia
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a)Author to whom correspondence should be addressed: [email protected]
Phys. Plasmas 27, 062502 (2020)
Article history
Received:
December 19 2019
Accepted:
April 30 2020
Citation
R. Sharma, P. O. Khabanov, A. V. Melnikov, C. Hidalgo, A. Cappa, A. Chmyga, L. G. Eliseev, T. Estrada, N. K. Kharchev, A. S. Kozachek, L. I. Krupnik, A. Malaquias, B. van Milligen, A. Molinero, J. L. de Pablos, I. Pastor, V. N. Zenin; Measurements of 2D poloidal plasma profiles and fluctuations in ECRH plasmas using the heavy ion beam probe system in the TJ-II stellarator. Phys. Plasmas 1 June 2020; 27 (6): 062502. https://doi.org/10.1063/1.5142996
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