Figure 1From: A retarding field thermal probe for combined plasma diagnostics(a) Or: orifice; G0: grounded grid; G1: screen grid; G2: scan grid; G3: secondary electron (SE) repeller; coll: collector plate; (b) The static voltages V1, V3 and V4 applied to the respective grids and the voltage ramp barrier V2, as usually used by an RFEABack to article page