DOAJ Open Access 2024

Importance of the Rotational Transform for L–H Transitions in the TJ-II Stellarator

Boudewijn Philip van Milligen Teresa Estrada Benjamin Carreras Luis García the TJ-II Team

Abstrak

We study the effect of the rotational transform profile on the L–H confinement transitions in the neutral beam-heated plasmas in the TJ-II stellarator. The rotational transform profile in the vacuum is determined by the external coil currents but is modified by the plasma current, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>I</mi><mi>p</mi></msub></semantics></math></inline-formula>. We find that L–H confinement transitions systematically occur when the configuration and plasma current are such that a low-order rational is placed in the plasma edge region, with a distribution centered around <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>ρ</mi><mo>=</mo><mn>0.8</mn><mo>±</mo><mn>0.05</mn></mrow></semantics></math></inline-formula>. It is suggested that magnetohydrodynamic turbulence plays an important role in triggering the L–H transitions at TJ-II.

Topik & Kata Kunci

Physics Plasma physics. Ionized gases

Penulis (5)

Boudewijn Philip van Milligen

Teresa Estrada

Benjamin Carreras

Luis García

the TJ-II Team

Format Sitasi

APA MLA BibTeX

Milligen, B.P.v., Estrada, T., Carreras, B., García, L., Team, t.T. (2024). Importance of the Rotational Transform for L–H Transitions in the TJ-II Stellarator. https://doi.org/10.3390/plasma7020024

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Informasi Jurnal

Tahun Terbit: 2024
Sumber Database: DOAJ
DOI: 10.3390/plasma7020024
Akses: Open Access ✓