| Issue |
EPJ Web Conf.
Volume 346, 2026
25th Topical Conference on Radio-Frequency Power in Plasmas (RFPPC2025)
|
|
|---|---|---|
| Article Number | 01024 | |
| Number of page(s) | 6 | |
| Section | Theory and Modeling of Radio-Frequency Waves in Plasmas | |
| DOI | https://doi.org/10.1051/epjconf/202634601024 | |
| Published online | 07 January 2026 | |
https://doi.org/10.1051/epjconf/202634601024
Studies of various lower hybrid wave launch scenarios for non-inductive start-up on TST-2
The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
* Corresponding author: tsujii@k.u-tokyo.ac.jp
Published online: 7 January 2026
Efficient non-inductive start-up of a spherical tokamak may be achieved by using lower hybrid waves that have high current drive efficiency. On the TST-2 spherical tokamak, three lower hybrid launchers are installed at the outer-midplane, top and outer-off-midplane to explore efficient start-up scenarios. The previously installed outer-midplane and top launchers were both found to drive current far off-axis where confinement of fast electrons were expected to be low. The outer-off-midplane launcher was newly developed to increase current drive by improving absorption closer to the magnetic axis. The outer-off-midplane launcher driven plasma was confirmed to have higher core electron temperature than those of the previous two launchers, and reduced fast electron losses compared to the top launcher.
© The Authors, published by EDP Sciences, 2026
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