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Title:
Confined ion energy >200 keV and increased fusion yield in a DPF with monolithic tungsten electrodes and pre-ionization
Authors:
Lerner, Eric J.; Hassan, Syed M.; Karamitsos, Ivana; Von Roessel, Fred
Affiliation:
AA(LPP Fusion, Inc., Middlesex, New Jersey 08846, USA 0000-0001-9804-7357), AB(LPP Fusion, Inc., Middlesex, New Jersey 08846, USA), AC(LPP Fusion, Inc., Middlesex, New Jersey 08846, USA), AD(LPP Fusion, Inc., Middlesex, New Jersey 08846, USA)
Publication:
Physics of Plasmas, Volume 24, Issue 10, id.102708 (PhPl Homepage)
Publication Date:
10/2017
Origin:
AIP
Abstract Copyright:
:
DOI:
10.1063/1.4989859
Bibliographic Code:
2017PhPl...24j2708L

Abstract

To reduce impurities in the dense plasma focus FF-1 device, we used monolithic tungsten electrodes with pre-ionization. With this new set-up, we demonstrated a three-fold reduction of impurities by mass and a ten-fold reduction by ion number. FF-1 produced a 50% increase in fusion yield over our previous copper electrodes, both for a single shot and for a mean of ten consecutive shots with the same conditions. These results represent a doubling of fusion yield as compared with any other plasma focus device with the same 60 kJ energy input. In addition, FF-1 produced a new single-shot record of 240 ± 20 keV for mean ion energy, a record for any confined fusion plasma, using any device, and a 50% improvement in ten-shot mean ion energy. With a deuterium-nitrogen mix and corona-discharge pre-ionization, we were also able to reduce the standard deviation in the fusion yield to about 15%, a four-fold reduction over the copper-electrode results. We intend to further reduce impurities with new experiments using microwave treatment of tungsten electrodes, followed by the use of beryllium electrodes.
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