Just a demonstration how you can achieve tesla function with vortex form.
MOSFET used: FDL100N50F
Primary: 26 x 24 AWG silver plated enamel coated copper wire.
Secondary: 28 AWG x 16" on a 2" OD PVC tube.
Top-load: 8 ring 9 cut-out POE Vortex coil 36 strands of 22 AWG in series.
14-30 watt power consumption in video @ approx 50 Volts.