Design improvements in Tesla coil performance

Certain aspects of Tesla coil design are considered, which enable greater spark-lengths to be generated for a given input power than has previously been achieved. By this definition, efficiency is improved. These techniques can be applied to any high repetition-rate resonant transformer without the need for lengthy redesign. This research has been collaboratively pursued by a number of people using an internet mailing list group. In this paper, recent work is described and contributions are made to the discussion of the relative validity of lumped circuit versus transmission line modelling