Plasma boundary and SOL studies of ECH-plasmas in TJ-II stellarator with diagnosed mobile poloidal limiters

被引：6

作者：

de la Cal, E ^{[1
]}

Brañas, B ^{[1
]}

Tabarés, FL ^{[1
]}

Tafalla, D ^{[1
]}

Fraguas, AL ^{[1
]}

Pedrosa, MA ^{[1
]}

Tribaldos, V ^{[1
]}

Ascasibar, E ^{[1
]}

Herranz, J ^{[1
]}

Pastor, I ^{[1
]}

机构：

[1] Asociac Euratm Ciemat, E-28040 Madrid, Spain

来源：

JOURNAL OF NUCLEAR MATERIALS | 2001年 / 290卷

关键词：

TJ-II; limiter; SOL;

D O I：

10.1016/S0022-3115(00)00525-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

TJ-LI is a medium size (major radius R = 1.5 m, average minor plasma radius a < 0.2 m, on axis magnetic field B = 1 T) helical axis stellarator operating in its first phase with up to 600 kW of ECH power. Two mobile poloidal limiters can control the last closed magnetic surface (LCMS) and diagnose the plasma boundary with a set of Langmuir probes and with CCD-cameras equipped with interference filters. In the described experiments, plasmas with different minor radii interact either with the toroidal limiter or with the mobile poloidal limiters. The electron density and temperature profiles are characterised in the plasma centre, boundary and scape-off layer (SOL) for the different configurations. The global energy for the different configurations is compared and the ratio of the energy confinement time to that obtained by the LHD-scaling-law, seem to be improved when inserting the poloidal limiters. Finally, it is discussed whether the large connection lengths obtained in certain poloidal limiter SOL regions effectively reduce the plasma size, making the definition of the plasma minor radius ambiguous. <(c)> 2001 Elsevier Science B.V. All rights reserved.

引用

页码：579 / 583

页数：5

共 7 条

[1] The diagnosed mobile limiters of the TJ-II stellarator for plasma boundary studies [J].