Planned since 1952, construction began in 1961 at what is today the Princeton Plasma Physics Laboratory (PPPL).
Model C ultimately failed to reach this goal, producing electron temperatures of 400 eV when about 100,000 were needed.
The total circumference of the magnetic axis was 12 m.[2] The plasma could have a 5-7.5 cm minor radius.
In the other it could inject 4 MW of 25 MHz ion cyclotron resonance heating (ICRH).
Construction funding/approval was announced in April 1957 with the design based on Katherine Weimer's efforts in fundamental research.