We present a uniquely fast (10 μs) ion temperature measurements in the tokamak edge plasma. Our approach is based on the sweeping of a ball-pen probe, where the ion temperature is obtained by fitting the electron branch of the corresponding I–V characteristic. We have performed measurements on the COMPASS tokamak during L-mode discharge. The temperature histograms reveal a non-Gaussian shape with a high-temperature tail peaking at low values. The fitted values of fast I–V measurements can be used to reconstruct (emulate) the slow swept I–V characteristic of a retarding field analyzer. The resulting ion temperature profile is nearly flat and provides a ratio of ion to electron temperature close to 1–2 in the vicinity of the last closed flux surface during L-mode discharges, as observed on other tokamaks.

我们在托卡马克边缘等离子体中提供了独特的快速（10μs）离子温度测量。我们的方法是基于圆珠笔探针的扫掠，其中离子温度是通过拟合相应的I – V特性的电子支路而获得的。在L模式放电期间，我们已经在COMPASS托卡马克上进行了测量。温度直方图显示非高斯形状，且高温尾部峰值较低。快速I – V测量的拟合值可用于重建（模拟）缓慢扫描的I – V延迟场分析仪的特性。如其他托卡马克所观察到的那样，在L型放电期间，最后一个封闭通量表面附近的离子温度与电子温度之比接近1-2，由此得到的离子温度分布几乎是平坦的。