10th International symposium on Negative Ions, Beams and Sources - NIBS'26

Session

S1: Chairperson -- Lenaic Couedel, U. Marseille

Sep 21, 2026, 9:00 AM

Conference Room (Prestige Lakeside Resort Nelson)

25. Shedding Light on the Cesium Sputter Ion Source

Martin Martschini (University of Vienna, Faculty of Physics – Isotope Physics, VERA Laboratory, Vienna, Austria)

9/21/26, 9:00 AM

Invited

Accelerator mass spectrometry (AMS) aims at highly efficient and fast detection of minute amounts of radioisotopes and thus crucially depends among others on the attainable negative ion output from a cesium sputter ion source. However, part of the physics behind these work horses remains elusive, prohibiting accurate simulations or even sound predictions of ion source behavior. Generations of...

60. Diagnostic Measurements and Performance of the Cesiated H- Source at LANL

David Kleinjan (Los Alamos National Laboratory)

9/21/26, 9:25 AM

Invited

The LANSCE H- Ion Source has recently been studied with laser absorption and optical emission spectroscopy diagnostics capable of measuring the in-situ cesium density and temperature, the neutral hydrogen temperature and the $H_{\alpha,\beta,\gamma}$ emission lines. These diagnostics have been installed on the LANSCE production sources for the 2026 run, which presents the first opportunity...

36. The role of surfaces in high-current negative hydrogen ion sources

Olli Tarvainen (STFC)

9/21/26, 9:50 AM

Invited

The production of negative hydrogen ions (H$^-$/D$^-$) in high-current ion sources occurs through two complementary mechanisms; dissociative electron attachment involving ro-vibrationally excited molecules and low energy electrons, and resonant tunneling of electrons from low work function caesiated metal surfaces to the affinity level of hydrogen atoms. We briefly describe the physics...

70. Application of TALIF for the Characterization of Negative Hydrogen Ion Production in Ion Sources for NBI

Julian Hörsch (Max-Planck-Institut für Plasmaphysik (IPP))

9/21/26, 10:15 AM

Contributed Oral

The understanding of the surface conversion process of hydrogen/deuterium atoms or positive ions to negative H⁻/D⁻ ions at a low work-function surface is of special interest for the physics of negative ion sources. The negative ion yield from surface conversion is determined by the work function of the converter surface, the flux of the precursor particles (H/D or Hₓ⁺/Dₓ⁺) on the surface and...