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458 Appendix A Vc voltage drop in hollow cathode, coupling voltage from neutralizer common potential to beam potential Vcg cathode to ground potential Vd discharge voltage Vf floating potential VG coupling voltage relative to ground in ion thrusters Vk voltage of electrons (primaries) from the cathode Vm magnet volume, minimum potential in grids Vnk potential of neutralizer cathode keeper Vp voltage drop in plasma, plasma generator potential Vs screen power supply voltage VT total voltage across accelerator gap = Vs + Va w width x distance, characteristic length of beam column y insert thickness Y sputtering yield Yad adatom production yield on cathode surface Yps sputtered particle yield from cathode surface Z atomic number A.5 Symbols thrust correction factor for doubly charged ions, work function correction constant, e-folding distance for plasma density decrease, constant in Bessel’s function argument m mass utilization correction factor due to the multiply charge ions adjustable coefficient to Bohm collision frequency total thrust correction factor = Ft, secondary electron yield o secondary electron yield at the space-charge limit flux of particlesPDF Image | Fundamentals of Electric Propulsion: Ion and Hall Thrusters
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