Translation speed measurements of hydrogen, helium, and argon field-reversed configurations in the central cell of a KMAX mirror device

Abstract

A series of experimental results of field-reversed configurations (FRCs) on a KMAX (Keda Mirror with AXisymmetricity) tandem mirror machine are reported. Single-side FRC translation processes with three different gas species were measured by avalanche photodiodes. Consistent with the theoretical prediction, the measured FRC speeds were inversely proportional to the square root of the ion mass. However, the speeds of the hydrogen FRC increased even in a uniform magnetic field region while the speeds of the helium and argon FRCs decreased. Possible mechanisms are discussed. The speed of the second pass due to the reflection of the mirror fields was found to be ∼1/3 of the first pass speed. The internal magnetic fields were measured for a colliding-merging argon FRC, and the results show that, even for very slowmoving FRCs, merging can occur.

The dynamic axial compression of FRC with high-speed translated θ-pinch plasma

“…As expected, FRC has a hollow while θ-pinch plasma has a peaked density profile. The FRC is accelerated into the central cell by magnetic gradient, and the translation speed v z of plasma can be estimated by time-of-flight method from the APD array or the B e array in KMAX [30,33]. In this experiment, the estimated v z of north FRC is about 60 km s −1 , which is near or slightly larger than the Alfvén speed.…”