Triple Probe Measurements in Transient Plasma of Pulsed Capacitive Discharge
Tóm tắt
Triple Langmuir probe (TLP) technique is used to measure local and time-resolved plasma parameters in pulsed capacitive discharge. This technique allows the instantaneous measurement of plasma parameters in transient discharges and obviates the need of any voltage or frequency sweep. In TLP configuration, two probes are differentially biased to acquire ion-saturation current whereas third probe is kept floating into plasma to measure floating potential. Thus TLP technique enables to measure electron temperature T
e
, electron number density n
e
, floating potential V
f
, and their fluctuations as a function of time in rapidly time-varying plasmas. The results presented here demonstrate the progression of capacitive discharge for different fill pressures. This technique would be useful in measuring the temporal behavior of rapidly-time varying plasmas, such as the turbulence in the edge region of magnetically confined fusion plasma of GLAST Spherical Tokamak.
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