15.75 in quick check of fields in a test structure – design will be improved A Ross Engineering Toroid water jetted plate ground plane shaped button cable connection electrode 20 kV bias ~5.6 cm

read C/cm as kV/cm

Tipped toroid connection top of 3/8 in plate ¾ in below toroid center plate to floor 5.3 cm

tipped toroid connection

can raise toroid to equalize field on disk with plate corner

6 in radius sphere section 3/8 inch high 1/8 inch hole fillet radius.02 inch

Hot spot is on disk edge for this case with top 7/8 inch below toroid center

Ross Engineering T201 toroid 21 inch outside diameter 3 inch diameter ring

The T201 is rated for 200 kV This is a check of this design to see what field they are running with a 200 kV rating. Calculate the field with toroid far from ground boundaries with a 200 kV bias The potential is shown here.

The field strength is shown here. The maximum field on the surface of the toroid is 20 kV/cm with a 200 kV bias. This is 2/3 of the breakdown field in air. Ross Engineering T201 toroid biased to 200 kV