Characterization of energy confinement in net-current free plasmas using the extended International Stellarator Database
Characterization of energy confinement in net-current free plasmas using the extended International Stellarator Database
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DOI：
10.1088/0029-5515/45/12/024
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发表时间：
2005-12-01
期刊：
影响因子：
3.3
通讯作者：
Suzuki, Y
中科院分区：
文献类型：
--
作者：
Yamada, H;Harris, JH;Suzuki, Y
关于仿星器约束数据库开发的国际合作取得了进展。从九个主要仿星器实验中收集了3000多个数据点。已经证实了能量约束时间对密度和加热功率的鲁棒依赖性。已使用机器间分析评估了对其他操作参数（即长半径和短半径、磁场和旋转变换（t））的依赖性。为了表达在一个统一的标度律的能量约束，在每个子组的系统差异进行量化。采用ISS 95上的约束增强因子作为重正化构型相关参数的后验方法，得到了新的标度表达式ISS 04：tau（E）（ISS 04）= 0.134 a（2.28）R-0.64 P-e（-0.61）B（0.84）tau（2/3）（0.41）。Gyro-Bohm特性类似于ISS 95已被确认为扩展数据库具有更广泛的等离子体参数和磁配置比在ISS 95的研究。它也被发现，有一个系统的磁配置之间的能量约束的偏移，其措施与外部仿星器场的有效螺旋涟漪。有关国际仿星器约束数据库的完整文档，请访问http://iscdb.nifs.ac.jp/和http://www.ipp.mpg.de/ISS。
International collaboration on development of a stellarator confinement database has progressed. More than 3000 data points from nine major stellarator experiments have been compiled. Robust dependences of the energy confinement time on the density and the heating power have been confirmed. Dependences on other operational parameters, i.e. the major and minor radii, magnetic field and the rotational transform (t), have been evaluated using inter-machine analyses. In order to express the energy confinement in a unified scaling law, systematic differences in each subgroup are quantified. An a posteriori approach using a confinement enhancement factor on ISS95 as a renormalizing configuration-dependent parameter yields a new scaling expression ISS04; tau(E)(ISS04) = 0.134a(2.28) R-0.64 P-e(-0.61) B(0.84)tau(2/3)(0.41). Gyro-Bohm characteristic similar to ISS95 has been confirmed for the extended database with a wider range of plasma parameters and magnetic configurations than in the study of ISS95. It has also been discovered that there is a systematic offset of energy confinement between magnetic configurations, and its measure correlates with the effective helical ripple of the external stellarator field. Full documentation of the International Stellarator Confinement Database is available at http://iscdb.nifs.ac.jp/ and http://www.ipp.mpg.de/ISS.