Mazurenko A, Porkolab M, Mossessian D, Snipes J A, Xu X Q, Nevins W M
Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge 02139, USA.
Phys Rev Lett. 2002 Nov 25;89(22):225004. doi: 10.1103/PhysRevLett.89.225004. Epub 2002 Nov 12.
A comparison of experimental measurements and theoretical studies of the quasicoherent (QC) mode, observed at high densities during enhanced D(alpha) (EDA) H mode in the Alcator C-Mod tokamak, are reported. The QC mode is a high frequency ( approximately 100 kHz) nearly sinusoidal fluctuation in density and magnetic field, localized in the steep density gradient ("pedestal") at the plasma edge, with typical wave numbers k(R) approximately 3-6 cm(-1), k(theta) approximately 1.3 cm(-1) (midplane). It is proposed here that the QC mode is a form of resistive ballooning mode known as the resistive X-point mode, in reasonable agreement with predictions by the BOUT (boundary-plasma turbulence) code.
报告了在Alcator C-Mod托卡马克装置的增强D（α）（EDA）H模高密度条件下观测到的准相干（QC）模的实验测量结果与理论研究的比较。QC模是一种高频（约100kHz）、密度和磁场中近似正弦的波动，局域于等离子体边缘陡峭的密度梯度（“台基”）处，典型波数k（R）约为3 - 6cm⁻¹，k（θ）约为1.3cm⁻¹（中平面）。本文提出，QC模是一种电阻气球模形式，即电阻X点模，这与BOUT（边界等离子体湍流）程序的预测相当吻合。
