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Author: Kollasch S Jeffrey
Requested Type: Poster
Submitted: 2016-02-15 11:31:44

Co-authors: C.R. Sovinec, O. Schmitz

Contact Info:
University of Wisconsin -- Madison
1500 Engineering Dr
Madison, WI   53711

Abstract Text:
Helicon discharges provide a versatile and efficient means of achieving high-density plasmas. While great progress has been made modeling helicons in the past twenty years, making accurate predictions of device performance is still a challenge. One particular issue is the neutral gas depletion effect in which core neutral density is very low due to neutrals being rapidly ionized, transported to the chamber ends as ions where they recombine, and then are pumped out of the device. This depleted neutral profile may limit the maximum plasma density achievable in a device, and is one motivation for this research. A simulation framework is being developed to model laboratory devices in three-dimensions by coupling a finite-volume RF antenna code to a kinetic model for ions and a fluid model for electrons. In addition the self-consistent scheme will incorporate a Monte Carlo neutral code so that the details of the neutral gas depletion effect can be explored and understood. Simulations will be compared to results from the MARIA experiment at UW-Madison. Preliminary results presented in this poster focus mainly on the RF aspect of the code.