Proto S-1C

Spheromak

Proto S-1C was a prototype of S-1 built at PPPL. It was a bigger version of Proto S-1A and 1/3 of the size of S-1. It was used for impurity control studies. It achieved temperatures above 40 eV and densities around 10²⁰ m^-3. The plasma in Proto S-1C had toroidal and poloidal currents of 60 kA and 120 kA respectively.