Understanding energetic particle transport due to magnetohydrodynamic instabilities excited by energetic particles is essential to apprehend alpha particle confinement in a fusion burning plasma. In the large helical device (LHD), beam ion and deuterium–deuterium fusion-born triton transport due to resistive interchange mode destabilized by helically-trapped energetic ions (EIC) are studied employing comprehensive neutron diagnostics, such as the neutron flux monitor and a newly developed scintillating fiber detector characterized by high detection efficiency. Beam ion transport due to EIC is studied in deuterium plasmas with full deuterium or hydrogen/deuterium beam injections. The total neutron emission rate (S _n) measurement indicates that EIC induces about a 6% loss of passing transit beam ions and a 60% loss of helically-trapped ions. The loss rate of helically-trapped ions, which drive EIC, is larger than the loss rate of passing transit beam ions. Furthermore, the drop of S _n increasing linearly with the EIC amplitude shows that barely confined beam ions existing near the confinement-loss boundary are lost due to EIC. In full deuterium conditions, a study of deuterium–deuterium fusion-born triton transport due to EIC is performed by time-resolved measurement of total secondary deuterium–tritium neutron emission rate (S _{n_DT}). Drop of S _{n_DT} increases substantially with EIC amplitude to the third power and reaches up to 30%. The relation shows that not only tritons confined in confined-loss boundary, but also tritons confined in the inner region of a plasma, are substantially transported.

了解由高能粒子激发的磁流体动力学不稳定性引起的高能粒子传输对于理解聚变燃烧等离子体中的 α 粒子限制至关重要。在大型螺旋装置 (LHD) 中，使用综合中子诊断技术，如中子通量监测器和新开发的闪烁光纤探测器，具有探测效率高的特点。在具有全氘或氢/氘束注入的氘等离子体中研究了由 EIC 引起的束离子传输。总中子发射率 ( S _n) 测量表明，EIC 导致通过的传输束离子损失约 6%，螺旋俘获离子损失 60%。驱动 EIC 的螺旋俘获离子的损失率大于通过的传输束离子的损失率。此外，随着 EIC 振幅线性增加的S _n下降表明，由于 EIC，存在于限制损失边界附近的几乎不受限制的束离子丢失。在全氘条件下，通过对总二次氘-氚中子发射率 ( S _{n_DT} )的时间分辨测量，对由于 EIC 引起的氘-氘聚变产生的氚传输进行了研究。掉落的小号 _{n_DT}随着 EIC 振幅的三次方大幅增加，最高可达 30%。该关系式表明，不仅限制在受限损失边界内的氚核，而且限制在等离子体内部区域的氚核都被大量传输。