论文标题
电磁电子漂移波湍流在Tokamak基座区域的固有电流驱动
Intrinsic current drive by electromagnetic electron drift wave turbulence in tokamak pedestal region
论文作者
论文摘要
通过分析研究了由电子漂移波（DW）湍流驱动的局部固有平行电流密度，包括电磁（EM）效应。由残留湍流驱动的固有电流密度的比例和湍流源驱动到具有电子密度和温度的引导电流密度为$ t_e^{3/4} t_i/n_e/n_e $和$ t_ET_I/n_e $。基于DIII-D基座区域的典型参数，由残留湍流和湍流源驱动的局部固有电流密度可以忽略不计。然而，尽管湍流源驱动电流可忽略不计，但由于EM DW湍流而导致的残留湍流驱动的局部固有电流密度可以达到ITER基座参数的Bootstrap电流密度的66％，因为ITER的碰撞率低于DIIII-D。此外，分析了等离子体对电磁波动响应的绝热零件，非覆盖的ES零件和非绝热的部分的贡献。发现在iTer基座案例中，非吸光ES响应与非绝热的EM响应之间存在强烈的取消，因此，平行电子压力的合并ES响应构成了内在电流驱动器的能力应力。这与ES电子DW情况不同。因此，在将来的反应器中应仔细考虑EM对湍流驱动的固有电流密度的影响，电子压力与磁压力和陡峭的压力曲线相比高。
The local intrinsic parallel current density driven by electron drift wave (DW) turbulence including electromagnetic (EM) effects is analytically studied. The scalings of the ratios of intrinsic current density driven by residual turbulent flux and by turbulent source to the bootstrap current density with electron density and temperature are predicted to be $T_e^{3/4}T_i/n_e$ and $T_eT_i/n_e$, respectively. Based on the typical parameters in DIII-D pedestal region, the local intrinsic current density driven by both the residual turbulent flux and the turbulent source is negligible. However, despite the negligible turbulent source driven current, the residual turbulent flux driven local intrinsic current density by EM DW turbulence can reach about 66% of the bootstrap current density for ITER pedestal parameters due to much lower collisionality in ITER than in DIII-D. Moreover, the contributions from adiabatic ES parts, non-adiabatic ES parts and non-adiabatic EM parts of the plasma response to electromagnetic fluctuations are analyzed. It is found that there exists strong cancelation between non-adiabatic ES response and the non-adiabatic EM response for the ITER pedestal case, and thus the kinetic stress contributed by the adiabatic ES response of parallel electron pressure dominates the intrinsic current drive. This is different from the ES electron DW case. Therefore, the EM effects on turbulence driven intrinsic current density should be carefully considered in the future reactor with high ratio of electron pressure to the magnetic pressure and steep pressure profile.
