“…Beamplasma interaction experiments have revealed the enhancement of the stopping power due to plasma effects~Young et al, 1982;Hoffmann et al, 1990;Couillaud et al, 1994;Jacoby et al, 1995!. Most of the experiments used discharge plasma targets because they were superior in uniformity, line density, and lifetime to the other plasma targets such as laser-produced plasmas. However, the strong magnetic field induced by large discharge current often prevented the beams from penetrating the target effectively, which resulted in unwanted beam signal attenuation~plasma-lens effect!.…”