In:
Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 0, No. 0 ( 2023), p. 0-
Abstract:
In magnetic confinement fusion plasmas, radio-frequency wave heating in the Ion Cyclotron Range of Frequencies (ICRF) and Neutral Beam Injection (NBI) are two main heating methods. Their synergetic heating has long been a key topic in fusion research. In this paper, we clarified the basic principles of ICRF high harmonic heating and the synergetic heating between ICRF and NBI. Then, we performed a series of experiments on EAST tokamak and carried out the corresponding TRANSP simulations. The results indicate that the ICRF-NBI synergetic heating not only significantly increases the plasma parameters (including poloidal beta, plasma stored energy, ion temperature and neutron yield), but also generates large number of energetic particles and develops an energetic particle tail in its distribution function. For instance, ICRF third harmonic heating with a power of 1MW can increase the energy of NBI fast ions from 60keV to 600keV. By changing the Hydrogen minority concentration, improving the ICRF and NBI heating power, using the on-axis ICRF heating or optimizing the NBI injection angle, the ICRF-NBI synergetic heating effect can be further enhanced, accompanying with an increase of fast ion energy. Moreover, by using the fast ion distributions as inputs in the orbit tracing codes, the transport and loss of energetic particles were calculated. The results show that the initial positions of the lost energetic particles are on the low field side, and their orbits are mainly trapped orbits. The energetic particles are mostly lost on the upper and midplane of the main limiter, ICRF and LH antenna limiters. The lost of these energetic particles are considered as one of the main reasons that leading to hot spots on the limiters.
Type of Medium:
Online Resource
ISSN:
1000-3290
,
1000-3290
DOI:
10.7498/aps.72.20230482
Language:
Unknown
Publisher:
Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
Publication Date:
2023
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