receiving a microwave from a co-axial cable, with a first impedance, into an electron cyclotron resonance source, said electron cyclotron resonance source comprising: a housing containing a first transform material and a transmission section;

passing the microwave through said first transform material with a second impedance;

coupling the microwave into said transmission section of said electron cyclotron resonance source, said transmission section comprising a third impedance, said transmission section comprising a first dielectric gap positioned between an inner conductor and an outer conductor;

generating a magnetic field with a set of magnets; and

accelerating cyclotron resonant electrons circulating about said magnet field with the microwave.