2004/11/13 by Angel Jose Chacon Velasco, Ángel José Chacón Velasco, Velasco, Angel Jose Chacon +3
Engineering · Physics and Astronomy · #FOS: Physical sciences #Muon and positron interactions and applications #Particle accelerators and beam dynamics #Plasma Diagnostics and Applications #Plasma Physics (physics.plasm-ph) #physics.plasm-ph
paper · pdf · doi:10.48550/arxiv.physics/0411128
12th International Congress on Plasma Physics, 25-29 October 2004, Nice (France)
arxiv created 2004/11/13 · openalex publication_date 2004/11/13 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this report, we describe characteristics of a ring-structure hydrogen plasma heated in electron cyclotron resonance conditions and confined in a mirror magnetic trap and discuss the relative efficiency of secondary electrons and thermoelectrons in negative hydrogen and deuterium ion production. The obtained data and calculations of the balance equations for possible reactions demonstrate that the negative ion production is realized in two stages. First, the hydrogen and deuterium molecules are excited in collisions with the plasma electrons to high-laying Rydberg or vibrational levels in the plasma volume. The second stage leads to the negative ion production through the process of dissociative attachment of low energy electrons. The low energy electrons are originated due to a bombardment of the plasma electrode by ions of one of the driven rings and thermoemission from heated tungsten filaments. Experiments seem to indicate that the negative ion generation occurs predominantly in the limited volume filled with thermoelectrons. Estimation of the negative ion generation rate shows that the main channel of and ion production involves the process of high Rydberg state excitation.