Chen, XinSánchez Arriaga, Gonzalo2019-06-182019-06-182017-09Journal of Physics: Conference Series, 958(1).1742-6588https://hdl.handle.net/10016/2850612th International Workshop on Electric Probes in Magnetized Plasmas (IWEP 2017)To model the sheath structure around an emissive probe with cylindrical geometry, the Orbital-Motion theory takes advantage of three conserved quantities (distribution function, transverse energy, and angular momentum) to transform the stationary Vlasov-Poisson system into a single integro-differential equation. For a stationary collisionless unmagnetized plasma, this equation describes self-consistently the probe characteristics. By solving such an equation numerically, parametric analyses for the current-voltage (IV) and floating-potential (FP) characteristics can be performed, which show that: (a) for strong emission, the space-charge effects increase with probe radius; (b) the probe can float at a positive potential relative to the plasma; (c) a smaller probe radius is preferred for the FP method to determine the plasma potential; (d) the work function of the emitting material and the plasma-ion properties do not influence the reliability of the floating-potential method. Analytical analysis demonstrates that the inflection point of an IV curve for non-emitting probes occurs at the plasma potential. The flat potential is not a self-consistent solution for emissive probes.11eng© 2018 IOP Publishing Ltd.Atribución 3.0 Españaconference paperAeronáuticaopen access111112th International Workshop on Electric Probes in Magnetized Plasmas 2017 (IWEP 2017)958 (012001)CC/0000027663