A 57-Pin Langmuir Probe Array for Two-Dimensional Diagnosis in the Toroidal KT-5D Steady-State Plasma

HE Yinghua (何迎花); YU Yi (余羿); XU Xiaoyuan (徐小圆); WEN Yizhi (闻一之); et al.

doi:10.1088/1009-0630/15/8/04

Plasma Science and Technology > 2013 > 15(8): 738-744. > DOI: 10.1088/1009-0630/15/8/04

HE Yinghua (何迎花), YU Yi (余羿), XU Xiaoyuan (徐小圆), WEN Yizhi (闻一之), et al.. A 57-Pin Langmuir Probe Array for Two-Dimensional Diagnosis in the Toroidal KT-5D Steady-State Plasma[J]. Plasma Science and Technology, 2013, 15(8): 738-744. DOI: 10.1088/1009-0630/15/8/04

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A 57-Pin Langmuir Probe Array for Two-Dimensional Diagnosis in the Toroidal KT-5D Steady-State Plasma

University of Science and Technology of China, Hefei 230026, China

Funds: supported by National Natural Science Foundation of China (No.11105144) and the Fundamental Research Funds for the Central Universities of China (No.WK2030040022)

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Received Date: March 19, 2012

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Abstract

Abstract

In this article, the design idea of a 57-pin Langmuir probe array is presented, together with some experimental results. The manufacture technique of the probe array is discussed. Two- dimensional distributions of the plasma density, the floating potential and their fluctuations in the poloidal cross section are obtained. The blobs, which move radially and poloidally, cause great particle and energy transport. The charge neutralization by the poloidal movement of particles greatly decreases the vertical electric field in the helimak plasma. This leads to a confinement time which is two orders of magnitude larger than the theoretical prediction.
- simple magnetic torus,
- helimak,
- Langmuir probe array,
- blob

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