C. Fleurier

Ion beam-plasma interaction: A standard model approach

Abstract The interaction of energetic multicharged ion beams with separately produced target plasmas is investigated within a projectile-ion-target-electron bin

Energy loss of heavy ions in a hydrogen discharge plasma

Abstract The energy loss of heavy ions in a plasma environment was measured by a time-of-flight method (TOF). It was possible to determine the energy loss for s

Interaction of Heavy-Ion Beams with a Hydrogen Plasma: Plasma Lens Effect and Stopping Power Enhancement

By coupling a hydrogen plasma to a Tandem accelerator, transmission and energy losses of 2 MeV/u carbon and sulfur beams passing through a plasma target have been investigated. Fluctuations in beam transmission have been observed and attributed to a plasma lens effect. Moreover, energy loss measurements indicate an enhanced stopping power of the plasma relative to its cold matter equivalent.

Charge evolution of swift heavy ions in fusion plasmas

SummaryInfluence of target temperature, density and atomic number on the charge state of swift heavy ions interacting with hot and dense plasma is considered. Hydrogen targets exhibit strong temperature effects and large non-equilibrium charges, whereas interactions with heavy material are more sensitive to the density effect. Our new average correlated hydrogenic atom model (ACHAM) is presented. It enables us to cover the whole range of target densities of interest for swift heavyion-plasma interaction experiments.

Fast valve for ion beam-plasma interaction

Abstract We describe a valve used to separate a plasma operated at pressures higher than 5 mbar from a heavy ion beam line. The very fast opening of the valve prevents the ion beam from being perturbed by the neutral gas before entering or after exiting the plasma. Substantial improvements were obtained in heavy ion energy loss measurements compared to a former method using differential pumping.

Charge-state distributions of chlorine ions interacting with cold gas and with fully ionized plasma

Charge transfer of 4.3 MeV/u chlorine ions passing through a discharge plasma target is used as a probe to determine the plasma density and the ratio of impurities inside the plasma column. Charge-state distributions of 2 MeV/u chlorine ions passing through the plasma are then measured and compared to corresponding measurements in the cold gas. Stopping power measurements are also performed in both cases.

Heavy-ion beams to diagnose traces of heavy-element impurities in a hydrogen plasma discharge

SummaryCharge exchange of chlorine ions traversing a discharge plasma target is used as a probe to determine the rati of heavy impurities inside a plasma column. The rate coefficient of the recombination process is strongly related to the atomic number of the target atoms. High-Z impurities are much more efficient to modify the charge state distribution of the incoming chlorine ions. The ragne of detection could reach about 1‰ of the total number of atoms.

Stripping properties of a plasma medium for MeV/u chlorine ions

Abstract Clear experimental evidence of plasma stripping enhancement for chlorine ions in the MeV/u energy range is contrasted to its cold gas homologue at the same density. The velocity dependence of the charge distribution is modelled both in cold gas and in plasma experiments. Calculations are found to be in good agreement with the hypothesis of strongly reduced capture in the plasma case.

SPQR II: A beam-plasma interaction experiment

SPQR II is an interaction experiment designed to probe energy ‐and charge‐exchange of Cn+ ions at 2 MeV/a.m.u., flowing through a fully ionized plasma column of hydrogen with nl=1019 e‐cm−2 at T=5 eV.One expects a factor of two enhanced stopping over the cold gas case.

Ion Beam-Plasma Interaction for Particle Driven Fusion

The interaction of energetic multicharged ion beams with separately produced target plasmas is investigated within a projectile ion-target electron binary pattern. The validity conditions of the relevant standard model are asserted. A few extensions are suggested.