Measurement of profiles of the space potential in JIPP T-IIU tokamak plasmas by slow poloidal and fast toroidal sweeps of a heavy ion beam

Y. Hamada, A. Nishizawa, Y. Kawasumi, K. Narihara, K. Sato, T. Seki, K. Toi, H. Iguchi, akihide fujisawa, K. Adachi, A. Ejiri, S. Hidekuma, S. Hirokura, K. Ida, J. Koong, K. Kawahata, M. Kojima, R. Kumazawa, H. Huramoto, R. LiangH. Sakakita, M. Sasao, K. N. Sato, T. Tsuzuki, J. Xu, I. Yamada, T. Watari, I. Negi

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

By the use of simultaneous fast toroidal and slow poloidal sweeps of a heavy ion beam, plasma potential profiles in the JIPP T-IIU tokamak are measured at the rate of 120 spatial profiles per second. A new method to eliminate the error due to the change of out-of-plane entrance angle caused by large plasma current is successfully applied. One of the key factors is the very homogeneous characteristics of the energy analyser along the wide slit length. A shaped electrode system, instead of guard rings with a resistor chain, successfully increases the homogeneity of the analyser. Error due to the significant change of in-plane entrance angle during a poloidal sweep is carefully minimized and calibrated by a secondary beam ionized by neutral gas introduced in the vacuum vessel. The depth of the measured potential at the plasma centre reaches more than 1.5 keV in ohmic plasmas with an ion temperature of 600 eV. In some cases, a rather wide region of positive potential and a sharp decrease of the potential in the centre of the plasma are observed.

Original languageEnglish
Article number004
Pages (from-to)1743-1761
Number of pages19
JournalPlasma Physics and Controlled Fusion
Volume36
Issue number11
DOIs
Publication statusPublished - Dec 1 1994

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Heavy ions
Ion beams
heavy ions
ion beams
Plasmas
entrances
profiles
plasma potentials
plasma currents
neutral gases
ion temperature
resistors
homogeneity
vessels
slits
vacuum
electrodes
Resistors
rings
Vacuum

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Measurement of profiles of the space potential in JIPP T-IIU tokamak plasmas by slow poloidal and fast toroidal sweeps of a heavy ion beam. / Hamada, Y.; Nishizawa, A.; Kawasumi, Y.; Narihara, K.; Sato, K.; Seki, T.; Toi, K.; Iguchi, H.; fujisawa, akihide; Adachi, K.; Ejiri, A.; Hidekuma, S.; Hirokura, S.; Ida, K.; Koong, J.; Kawahata, K.; Kojima, M.; Kumazawa, R.; Huramoto, H.; Liang, R.; Sakakita, H.; Sasao, M.; Sato, K. N.; Tsuzuki, T.; Xu, J.; Yamada, I.; Watari, T.; Negi, I.

In: Plasma Physics and Controlled Fusion, Vol. 36, No. 11, 004, 01.12.1994, p. 1743-1761.

Research output: Contribution to journalArticle

Hamada, Y, Nishizawa, A, Kawasumi, Y, Narihara, K, Sato, K, Seki, T, Toi, K, Iguchi, H, fujisawa, A, Adachi, K, Ejiri, A, Hidekuma, S, Hirokura, S, Ida, K, Koong, J, Kawahata, K, Kojima, M, Kumazawa, R, Huramoto, H, Liang, R, Sakakita, H, Sasao, M, Sato, KN, Tsuzuki, T, Xu, J, Yamada, I, Watari, T & Negi, I 1994, 'Measurement of profiles of the space potential in JIPP T-IIU tokamak plasmas by slow poloidal and fast toroidal sweeps of a heavy ion beam', Plasma Physics and Controlled Fusion, vol. 36, no. 11, 004, pp. 1743-1761. https://doi.org/10.1088/0741-3335/36/11/004
Hamada, Y. ; Nishizawa, A. ; Kawasumi, Y. ; Narihara, K. ; Sato, K. ; Seki, T. ; Toi, K. ; Iguchi, H. ; fujisawa, akihide ; Adachi, K. ; Ejiri, A. ; Hidekuma, S. ; Hirokura, S. ; Ida, K. ; Koong, J. ; Kawahata, K. ; Kojima, M. ; Kumazawa, R. ; Huramoto, H. ; Liang, R. ; Sakakita, H. ; Sasao, M. ; Sato, K. N. ; Tsuzuki, T. ; Xu, J. ; Yamada, I. ; Watari, T. ; Negi, I. / Measurement of profiles of the space potential in JIPP T-IIU tokamak plasmas by slow poloidal and fast toroidal sweeps of a heavy ion beam. In: Plasma Physics and Controlled Fusion. 1994 ; Vol. 36, No. 11. pp. 1743-1761.
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AU - Nishizawa, A.

AU - Kawasumi, Y.

AU - Narihara, K.

AU - Sato, K.

AU - Seki, T.

AU - Toi, K.

AU - Iguchi, H.

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AU - Adachi, K.

AU - Ejiri, A.

AU - Hidekuma, S.

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AU - Ida, K.

AU - Koong, J.

AU - Kawahata, K.

AU - Kojima, M.

AU - Kumazawa, R.

AU - Huramoto, H.

AU - Liang, R.

AU - Sakakita, H.

AU - Sasao, M.

AU - Sato, K. N.

AU - Tsuzuki, T.

AU - Xu, J.

AU - Yamada, I.

AU - Watari, T.

AU - Negi, I.

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