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Abstract: We have significantly upgraded the capability of the Variable Specific Impulse Magnetoplasma Rocket (VASIMR) experiment (VX-50) to process over 50 kW of total Radio Frequency (RF) power. The VASIMR system is comprised of three main stages, plasma production using a helicon, ion cyclotron resonant frequency (ICRF) acceleration, and exhaust into a magnetic nozzle. Power capability of up to 30 kW is demonstrated in the plasma source and over 30 kW is coupled into the ICRF stage. Efficient plasma production is achieved with ion-electron pair investment costs of 100 eV. We measure plasma flux exceeding 1021 ion/s. Significant ion acceleration is observed using deuterium, neon and argon. Ion energies in excess of 300 eV are measured, with calculated ion velocities from 30 to 150 km/s. Efficient coupling of the RF power to the plasma (90 %) is also demonstrated. Calculated momentum flux is as high as 0.5 N. We introduce a new more powerful and optimized device, VX-100. This device is designed to rapidly develop spaceflight-lik