High density operation at JET by pellet refuelling
High density operation at JET by pellet refuelling
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DOI：
10.1088/0741-3335/44/9/310
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发表时间：
2002-09
影响因子：
2.2
通讯作者：
P. Lang;B. Alper;L. Baylor;M. Beurskens;J. Cordey;R. Dux;R. Felton;L. Garzotti;G. Haas;L. Horton;S. Jachmich;T. Jones;A. Lorenz;P. Lomas;M. Maraschek;H. W. Müller;J. Ongena;J. Rapp;K. Renk;M. Reich;R. Sartori;G. Schmidt;M. Stamp;W. Suttrop;E. Villedieu;D. Wilson
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文献类型：
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作者：
P. Lang;B. Alper;L. Baylor;M. Beurskens;J. Cordey;R. Dux;R. Felton;L. Garzotti;G. Haas;L. Horton;S. Jachmich;T. Jones;A. Lorenz;P. Lomas;M. Maraschek;H. W. Müller;J. Ongena;J. Rapp;K. Renk;M. Reich;R. Sartori;G. Schmidt;M. Stamp;W. Suttrop;E. Villedieu;D. Wilson
在射流中使用了几种方法，以实现高密度和良好的能量限制。其中之一是注入固体燃料颗粒，通过在等离子体柱内部沉积来实现高效的颗粒加油。研究了能够从环面磁场高场侧发射的新型弹丸发射系统在常规Elmy H型放电中实现这一任务的能力。对于IP=2.5 MA，BT=2.4T，平均三角度�δ�≈为0.34，主要以中性束加热约17 mW的等离子体配置，开发了优化的小球方案。球团工具扩大了可使用的操作范围，可用于喷气加油。例如，H模条件可以维持在超过格林沃尔德水平的密度。观察到等离子体能量约束在高密度下变得与密度无关。当在适当的脉冲计划中避免由于小球触发的MHD活动或寄生的小球生成气体而导致的约束恶化时，在保持等离子体的同时实现了具有更多峰值密度分布的增强的粒子库存
Several approaches are used at JET to achieve operation at high density with good energy confinement. One of them is the injection of solid fuel pellets to realize efficient particle refuelling by deposition deep inside the plasma column. The new pellet launch system capable of launching from the torus magnetic high field side was investigated for its capability to fulfil this task in conventional ELMy H-mode discharges. Optimized pellet scenarios were developed for plasma configurations with IP = 2.5 MA, Bt = 2.4 T, averaged triangularity � δ �≈ 0.34 and mainly neutral beam heating at a level of approximately 17 MW. The accessible operational range was extended by the pellet tool with respect to gas puff refuelling. For example, H-mode conditions could be maintained at densities beyond the Greenwald level. Plasma energy confinement was observed to become density independent at high densities. When avoiding confinement deterioration due to pellet triggered MHD activity or parasitic pellet born gas in appropriate pulse schedules, enhanced particle inventory with more peaked density profiles was achieved while maintaining the plasma