Scalings for tokamak energy confinement
Scalings for tokamak energy confinement
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DOI：
10.1088/0029-5515/30/10/001
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发表时间：
1990-10
期刊：
影响因子：
3.3
通讯作者：
P. Yushmanov;T. Takizuka;K. Riedel;O. Kardaun;J. Cordey;S. Kaye;D. Post
中科院分区：
文献类型：
--
作者：
P. Yushmanov;T. Takizuka;K. Riedel;O. Kardaun;J. Cordey;S. Kaye;D. Post
在分析ITER L模能量约束数据库的基础上，提出了两种新的托卡马克L模能量约束标度表达式，即幂函数标度和偏移线性标度。分析表明，目前托卡马克(Goldston，Kaye，Odajima-Shimomura，Rebut-Lallia等)中能量限制时间τE的标度表达式的多样性。这既是由于数据库中的关键参数组合fs=0.32R a−0.75k0.5∼A a0.25k0.5的变化，也是由于数据库中不同托卡马克之间τE对物理参数的依赖关系的变化。通过将f的倍数和另一个因子fq=1.56a2kB/rip=qeng/3.2结合起来，可以将提出的两个限制标度表达式转换成与大多数常见标度表达式非常接近的形式。该因子部分反映了τE对q的依赖关系，从而隐含地反映了τE对Ip和Ne的依赖关系。为了减少能量限制定标的多重性，必须通过添加具有显著变化的f的新数据来改进数据库，并且必须澄清托卡马克与托卡马克之间某些能量限制时间对托卡马克参数的依赖关系的物理原因。
On the basis of an analysis of the ITER L-mode energy confinement database, two new scaling expressions for tokamak L-mode energy confinement are proposed, namely a power law scaling and an offset-linear scaling. The analysis indicates that the present multiplicity of scaling expressions for the energy confinement time τE in tokamaks (Goldston, Kaye, Odajima-Shimomura, Rebut-Lallia, etc.) is due both to the lack of variation of a key parameter combination in the database, fs = 0.32 R a−0.75 k0.5 ∼ A a0.25k0.5, and to variations in the dependence of τE on the physical parameters among the different tokamaks in the database. By combining multiples of fs and another factor, fq = 1.56 a2 kB/RIp = qeng/3.2, which partially reflects the tokamak to tokamak variation of the dependence of τE on q and therefore implicitly the dependence of τE on Ip and ne, the two proposed confinement scaling expressions can be transformed to forms very close to most of the common scaling expressions. To reduce the multiplicity of the scalings for energy confinement, the database must be improved by adding new data with significant variations in fs, and the physical reasons for the tokamak to tokamak variation of some of the dependences of the energy confinement time on tokamak parameters must be clarified.