Elliptical (EAE) and toroidal Alfvén eigenmode (TAE) instabilities have been observed in hydrogen-rich JET discharges of the D- ( 3 He) -H ion cyclotron resonance heating (ICRH) scenario, which is characterized by strong absorption of radio frequency waves at very low concentrations of the resonant 3 He-ions. In the experiments, core localized TAEs with a frequency f TAE ≈ 280 kHz with mode numbers n = 3, 4, 5 and 6 were detected. Following the phase with TAE excitation, EAE modes at higher frequencies f EAE ≈ 550–580 kHz with mode numbers n = 1, 3, 5 were seen. These high frequency modes indicate that a MeV range population of trapped energetic ions was present in the plasma. The experimental evidence of existence of the MeV-energy 3 He-ions able to excite the AEs is provided by neutron and gamma-ray diagnostics as well as fast ion loss measurements. The ICRH modelling code calculations co...

中文翻译：

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富氢JET等离子体中MeV能量范围的3个He离子对椭圆和环形Alfvén本征模的激发

在D-（3 He）-H离子回旋共振加热（IC​​RH）场景的富氢JET放电中已经观察到椭圆（EAE）和环形Alfvén本征模（TAE）不稳定性，其特征是强烈吸收射频波在非常低的共振3 He离子浓度下。在实验中，检测到了频率为t TAE≈280 kHz，模式编号为n = 3、4、5和6的核心局部TAE。在以TAE激发的阶段之后，可以看到在较高的频率f EAE≈550–580 kHz处具有模式编号n = 1、3、5的EAE模式。这些高频模式表明等离子体中存在捕获的高能离子的MeV范围种群。中子和伽马射线诊断以及快速的离子损失测量提供了能够激发AE的MeV能3 He离子的实验证据。ICRH建模代码计算可以...