Effect of q-profile modification by LHCD on internal transport barriers in JET*Effect of q-profile m
Effect of q-profile modification by LHCD on internal transport barriers in JET*Effect of q-profile m
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DOI：
10.1088/0741-3335/43/7/303
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发表时间：
2001-07
影响因子：
2.2
通讯作者：
C. Challis;Y. Baranov;G. Conway;C. Gormezano;C. Gowers;N. Hawkes;T. Hender;E. Joffrin;J. Maill
中科院分区：
文献类型：
--
作者：
C. Challis;Y. Baranov;G. Conway;C. Gormezano;C. Gowers;N. Hawkes;T. Hender;E. Joffrin;J. Maill
优化剪切（OS）实验在射流可以产生一个内部传输势垒（ITB）在高功率加热阶段早期的等离子体放电。一个强有力的链接通常观察到的屏障的形成和一个整数q磁表面的位置在一个低磁剪切（S = r/q（dq/dr））区域的等离子体。然而，如果通过在主加热脉冲之前施加较低混合加热和电流驱动（LHCD）来修改这种实验的q分布，以在等离子体芯中提供减小的或负的磁剪切的区域，则可以形成ITB，其位置不表现出与特定内部磁表面的任何明显关联。初步结果表明，Q-配置文件修改使用LHCD前奏也可以用来减少ITB生成所需的加热功率水平。
Optimized shear (OS) experiments in JET can generate an internal transport barrier (ITB) during a high power heating phase early in the plasma discharge. A strong link is generally observed between the formation of the barrier and the location of an integer q magnetic surface within a low magnetic shear (s = r/q(dq/dr)) region of the plasma. However, if the q-profile for such experiments is modified by applying lower hybrid heating and current drive (LHCD) before the main heating pulse, to provide a region of reduced or negative magnetic shear in the plasma core, ITBs can be formed the location of which does not exhibit any apparent association with a particular internal magnetic surface. Initial results suggest that q-profile modification using an LHCD prelude can also be used to reduce the heating power level required for ITB generation.