  We report on the investigation and implementation of a lumped-component,
radio-frequency resonator used in a cryogenic vacuum environment to drive an
ion trap. The resonator was required to achieve the voltages necessary to trap
(about 100 V), while dissipating as little power as possible (< 250 mW).
Ultimately a voltage gain of 100 was measured at 5.7 K. Single calcium ions
were confined in a trap driven by this device, providing proof of successful
resonator operation at low temperature.
