[en] TOREX-4 is a torsatron Proof of Principle experiment designed to simultaneously achieve ntau approx. = to 5 x 10¹³, n approx. = to 5 x 10¹⁴/cm³, and T greater than or equal to 1 keV. TOREX-4 is capable of operating without externally driven currents; sufficient neutral beam power to reach betas of 2 to 5% is provided. The unique 4(+2) constant pitch angle winding configuration allows the reliable design of large systems with far greater experimental flexibility than can be achieved in conventional stellarators of comparable size. This will allow investigation of the basic physics questions of the torsatron configuration over a wide range of plasma properties and field configurations without sacrifice of the Proof of Principle goals