Synthetic helium beam diagnostic and underlying atomic data

Supersonic helium beam diagnostic for fluctuation measurements of electron temperature and density at the Tokamak TEXTOR.

A supersonic helium beam diagnostic, based on the line-ratio technique for high resolution electron density and temperature measurements in the plasma edge (r/a > 0.9) was designed, built, and optimised at TEXTOR (Torus Experiment for Technology Oriented Research). The supersonic injection system, based on the Campargue skimmer-nozzle concept, was developed and optimised in order to provide bot...

Atomic masses of tritium and helium-3.

By measuring the cyclotron frequency ratios of (3)He(+) to HD(+) and T(+) to HD(+), and using HD(+) as a mass reference, we obtain new atomic masses for (3)He and T. Our results are M[(3)He]=3.016 029 322 43(19)  u and M[T]=3.016 049 281 78(19)  u, where the uncertainty includes an uncertainty of 0.12 nu in the mass reference. Allowing for cancellation of common systematic errors, we find the Q...

LIF measurements on an atomic helium beam in the edge of a fusion plasma

M Krychowiak1), Ph Mertens2), R König1), B Schweer2), S Brezinsek2), O Schmitz2), M Brix3), U Samm2), T Klinger1) Max-Planck-Institut für Plasmaphysik, EURATOM-Association, Greifswald, Germany Institut für Energieforschung (Plasmaphysik), FZ Jülich, EURATOM-Association, TEC, Jülich, Germany and UKEA, JETExperimental Department, EURATOM-Association, Culham Science Centre, ABINGDON, Oxfordshire, ...

Validation of collisional radiative modelling of emission line ratios for helium beam plasma diagnostic

Helium beam shadowing for high spatial resolution patterning of antibodies on microstructured diagnostic surfaces

We have developed a technique for the high-resolution, self-aligning, and high-throughput patterning of antibody binding functionality on surfaces by selectively changing the reactivity of protein-coated surfaces in specific regions of a workpiece with a beam of energetic helium particles. The exposed areas are passivated with bovine serum albumin (BSA) and no longer bind the antigen. We demons...