Formation conditions for electron internal transport barriers in JT-60U plasmas

T. Fujita, T. Fukuda, Y. Sakamoto, S. Ide, T. Suzuki, H. Takenaga, K. Ida, H. Idei, T. Shimozuma, A. Fujisawa, S. Ohdachi, K. Toi

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Abstract

The formation of electron internal transport barriers (ITBs) was studied using electron cyclotron (EC) heating in JT-60U positive shear (PS) and reversed shear (RS) plasmas with scan of neutral beam (NB) power. With no or low values of NB power and with a small radial electric field (Er) gradient, a strong, box-type electron ITB was formed in RS plasmas while a peaked profile with no strong electron ITBs was observed in PS plasmas within the available EC power. When the NB power and the Er gradient were increased, the electron transport in strong electron ITBs with EC heating in RS plasmas was not affected, while electron thermal diffusivity was reduced in conjunction with the reduction of ion thermal diffusivity, and strong electron and ion ITBs were formed in PS plasmas.

Original languageEnglish
Pages (from-to)A35-A43
JournalPlasma Physics and Controlled Fusion
Volume46
Issue number5 SUPPL. A
DOIs
Publication statusPublished - May 2004

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

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    Fujita, T., Fukuda, T., Sakamoto, Y., Ide, S., Suzuki, T., Takenaga, H., Ida, K., Idei, H., Shimozuma, T., Fujisawa, A., Ohdachi, S., & Toi, K. (2004). Formation conditions for electron internal transport barriers in JT-60U plasmas. Plasma Physics and Controlled Fusion, 46(5 SUPPL. A), A35-A43. https://doi.org/10.1088/0741-3335/46/5A/003