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首页> 外文期刊>Plasma physics and controlled fusion >Effects of low particle fuelling and electron heating on the internal transport barrier in ICRF heated reversed magnetic shear plasmas of JT-60U
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Effects of low particle fuelling and electron heating on the internal transport barrier in ICRF heated reversed magnetic shear plasmas of JT-60U

机译：低颗粒燃料和电子加热对ICT加热的JT-60U反向磁剪切等离子体中内部输运势垒的影响

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摘要

Plasmas with an internal transport barrier (ITB) were heated with a second-harmonic ion cyclotron range of frequency (ICRF) minority heating during the reversed magnetic shear (RS) experiments in JT-60U. In order to control the central particle fuelling, the input power of the neutral beam injection (NBI) heating during ICRF heating was scanned shot-by-shot. The electron temperature gradient around the ITB increased with the total input power. Steeper gradients were obtained with additional ICRF heating by avoiding collapses induced by the steep pressure gradient. The difference of the time derivative at the ICRF injection timing indicated a fast ion loss of about 40% during the RS operation. The density gradient was increased with the central fuelling by the NBI heating and the shoulder position of the slope at the ITB moved outward with the particle fuelling. The particle confinement time at the ITB increased with the central particle fuelling while the particle confinement time of the low-fuelling discharges were similar to that of the normal shear L-mode discharge. [References: 23]
机译：在JT-60U的反向磁剪切（RS）实验过程中，使用第二谐波离子回旋加速器的频率范围（ICRF）少数加热来加热具有内部传输屏障（ITB）的血浆。为了控制中央粒子的加油，对ICRF加热期间中性束注入（NBI）加热的输入功率进行了逐个扫描。 ITB周围的电子温度梯度随总输入功率而增加。通过避免因陡峭的压力梯度而导致的坍塌，可以通过额外的ICRF加热获得更陡的梯度。在ICRF注入时间，时间导数的差异表明在RS操作过程中离子快速损失约40％。通过NBI加热，密度梯度随着中央燃料的添加而增加，ITB处的斜面的肩部位置随着颗粒燃料的添加而向外移动。随着中心颗粒的加注，ITB处的颗粒限制时间增加，而低燃料放电的颗粒限制时间与常规剪切L型放电的相似。 [参考：23]

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