Abstract
Measurements of the Doppler shift of impurity lines indicate that there is an ion flow of ∼7 km/s in the Irvine Field Reversed Configuration. A charge-exchange neutral particle analyzer shows the peak energy is below the 20 eV minimum detectable energy threshold, which is in agreement with the spectroscopic data. By evaluating the collision times between the impurities and hydrogen, the dominant plasma ion species, it is concluded that the ions rotate with an angular frequency of ∼4×104 rad/s. Estimates of the ion current in the laboratory frame indicate it is one to two orders of magnitude larger than the measured plasma current of 15 kA. Electron drifts are expected to cancel most of the ion current based on the measured magnetic fields and calculated electric fields.
Highlights
The stability of field reversed configurationsFRCshas shown promise over the years as a potential fusion reactor.1 It has been postulated2 that the stability can be attributed, in part, to large orbit ions
A theoretical equilibrium is presented and a density profile resulting from fitting the equilibrium magnetic fields to the experimental data is in Sec
Visible emission spectroscopy has been performed on various lines in IFRC
Summary
The stability of field reversed configurationsFRCshas shown promise over the years as a potential fusion reactor. It has been postulated that the stability can be attributed, in part, to large orbit ions. The stability of field reversed configurationsFRCshas shown promise over the years as a potential fusion reactor.. The stability of field reversed configurationsFRCshas shown promise over the years as a potential fusion reactor.1 It has been postulated that the stability can be attributed, in part, to large orbit ions. Past experiments have successfully measured ion impurity flow in a FRC.. Past experiments have successfully measured ion impurity flow in a FRC.4–6 The focus of these measurements, performed on the Field Reversal ExperimentFRX-Cand the FRC Injection ExperimentFIX, has primarily been to study the effect of a stabilizing quadrupole field.. The TS-3 experiment used the ion flow measurement in conjunction with electron density measurements using an electrostatic probe to arrive at the ion current density. The total current density was obtained from a two dimensional magnetic probe array
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