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In the triple Langmuir probe (T-LP) method, the electron temperature (Te )a nddensity (ne) can be simulta- neously derived from potential measurements of electrode of T-LP and the ion saturation current (Iis )w here no current flows in the electrodes for potential measurements. In the case of aiming at measuring high-frequency fluctuations, however, the smaller load resistance of e lectrode is required for high frequency response. Then the finite current can flow in the measurement circuits of the floating potential ( V f )a nd the plus-biased potential (Vp). When the current becomes comparable to Iis ,t heTe derived from measured V f and Vp without the cur- rent considerably deviates from an actual value. This would be significant for fairly low density plasma of the ne <∼ 5 × 10 17 m −3 ,a nd the correction of the finite current is necessary. A new relationship between Te and potential signals (V f and Vp )w here the fi nite current in the electrodes for V f and Vp measurements is taken into account was derived, and experimentally confirmed the validity in the experiments of the Compact Helical System. c

Measurement of Electron Density and Temperature and Their Fluctuations Using Modified Triple Langmuir Probe Grounded through Finite Resistance