Stopping power of dense helium plasma for fast heavy ions

Abstract

The interaction process between fast heavy ions and dense plasma was experimentally investigated. We injected 4.3-MeV0u or 6.0-MeV0u iron ions into a z-pinch-discharge helium plasma and measured the energy loss of the ions by the time of flight method. The energy loss of 4.3-MeV0u ions fairly agreed with theoretical prediction when the electron density of the target was on the order of 10 18 cm Ϫ3 . With increasing electron density beyond 10 19 cm Ϫ3 , the difference between the experiment and the theory became remarkable; the experimental energy loss was 15% larger than the theoretical value at the peak density. For 6.0-MeV0u ions, the deviation from the theory appeared even at densities below 10 19 cm Ϫ3 . These discrepancies indicated that density effects such as ladderlike ionization caused the enhancement of the projectile mean charge in the target.

High energy heavy ion jets emerging from laser plasma generated by long pulse laser beams from the NHELIX laser system at GSI

“…From earlier experiments with fully ionized hydrogen discharge and pinch plasmas it is well known, that ionized matter has an increased stopping power for heavy ions~Hoffmann et al, 1990;Jacoby et al, 1995;Roth et al, 2000;Hasegawa et al, 2003!, and that the charge state of heavy ion beams passing through plasma is considerably altered~Dietrich et al, 1992!. In order to achieve plasma parameters which extend far beyond those of discharge and pinch plasmas a laser Nd: glass laser system with total laser beam pulse energy well above 100 J was installed.…”

Beam–plasma interaction experiments using electromagnetically driven shock waves

“…The initial pressure of hydrogen gas in the shock tube was varied from 0.13 to 6.7 kPa. Then we calculated the energy loss of 10-20 keV/u Pb ions in the hydrogen plasmas by using an ion stopping calculation code including charge exchange processes of projectiles [7]. The initial projectile charge was varied from 2 to 10.…”

“…This so-called ''plasma effect'' has been examined experimentally by many research groups for the last two decades [1][2][3][4][5][6][7]. In these studies high-current discharges or high-power lasers produced ''classical'' plasma targets.…”

Kα radiation from low charge chlorine heated by an ion beam for cold dense plasma diagnostics

“…In the related experiments, time-of-flight (TOF) is one of the most powerful diagnostics for the purpose in the framework of particle diagnostics Oguri et al, 2000;Hasegawa et al, 2003). In the category of X-ray diagnostics, which is also one of the promising tools for the above purpose, Goel et al (1998) demonstrated some numerical calculations of Kα spectra from low-Z target material heated by a proton beam.…”