Design and performance of FRX-C/T: A compact toroid translation experiment

The FRX-C/T experiment is a combination of the FRX-C Θ-pinch, which forms field-reversed configuration (FRC) compact toroids, with a dc solenoid section, where the FRC (typical plasma parameters of n = 1-3 x 10/sup 15/ cm/sup -3/, T/sub e/+T/sub i/ = 0.2-0.7 keV, tau/sub E/ ≅ 100 μs) is translated and trapped in an axial dc guide field B/sub o/. The experiment combines pulsed, high-voltage technology for the Θ-pinch formation region with a dc energized magnet set for the translation section. Five stainless steel tank modules form the translation vacuum chamber. A B/sub o/ field of ≤ 8kG is generated by the thirty-nine water-cooled pancake magnets of the dc magnet set that is mounted concentric with the vacuum vessel. A dc magnetic mirror (ratio ≤ 5) is at the end of the translation region. The dc magnets are powered by a computer controlled and monitored 0.3 kV, 2.5 MW dc power supply. A computer monitored 78 channel digital thermal switch system and 128 channel analog thermistor system ensure that the coils do not overheat