Henriques R B, Malaquias A, Nedzelskiy I S, Silva C, Coelho R, Figueiredo H, Fernandes H
Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal.
Rev Sci Instrum. 2014 Nov;85(11):11D848. doi: 10.1063/1.4891045.
The Heavy Ion Beam Diagnostic (HIBD) on the tokamak ISTTOK (Instituto Superior Técnico TOKamak) has been modified, in terms of signal conditioning, to measure the local fluctuations of the neσ1,2(Te) product (plasma density times the effective ionization cross-section) along the tokamak minor diameter, in 12 sample volumes in the range of -0.7a < r < 0.7a, with a maximum delay time of 1 μs. The corresponding signals show high correlation with the magnetic Mirnov coils in the characteristic MHD frequency range of ISTTOK plasmas and enable the identification of tearing modes. This paper describes the HIBD signal conditioning system and presents a preliminary analysis of the radial profile measurements of local neσ1,2(Te) fluctuations.
托卡马克ISTTOK（高等技术学院托卡马克）上的重离子束诊断仪（HIBD）在信号调节方面进行了改进，以测量沿托卡马克小直径方向的neσ1,2(Te)乘积（等离子体密度乘以有效电离截面）的局部波动，测量范围为-0.7a < r < 0.7a的12个采样体积，最大延迟时间为1 μs。相应信号在ISTTOK等离子体的特征磁流体动力学频率范围内与磁米尔诺夫线圈显示出高度相关性，并能够识别撕裂模。本文描述了HIBD信号调节系统，并对局部neσ1,2(Te)波动的径向剖面测量进行了初步分析。
