A novel double hohlraum target to create a moderately coupled plasma for ion stopping experiments

作者：Ortner A^*; Faik S; Schumacher D; Basko M M; Blazevic A; Busold S; Bedacht S; Cayzac W; Frank A; Kraus D; Rienecker T; Schaumann G; Tauschwitz An; Wagner F; Roth M

来源：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms , 2015, 343: 123-131.

DOI：10.1016/j.nimb.2014.11.047

• Ion stopping in plasma
• Coupled plasma
• Non-ideal plasma
• 2D hydrodynamics
• Hohlraum radiation

We present a new double hohlraum target for the creation of a moderately coupled (0.1 < Gamma < 1) carbon plasma for energy loss and charge state measurements of projectile ions interacting with this plasma. A spherical cavity of 600 mu m in diameter is heated with a 150-J laser pulse (lambda(L) = 527 nm) within 1.2 ns to produce a quasi-Planckian X-ray source with a radiation temperature of T-r approximate to 100 eV. These X-rays are then used to heat volumetrically two thin carbon foils in a secondary cylindrical hohlraum to a dense plasma state. An axi-symmetric plasma column with a free-electron density of up to 8 x 10(21) cm(-3), a temperature of T approximate to 10 eV, and an average ionization degree of Z approximate to 3 is generated. This plasma stays in a dense and an almost uniform state for about 5 ns. Ultimately, such targets are supposed to be used in experiments where a heavy ion beam is launched through the sample plasma, and the ion energy losses as well as the charge distributions are to be measured. The present paper is in a certain sense a symbiotic one, where the theoretical analysis and the experimental results are combined to investigate the basic properties and the prospects of this type of plasma targets.

• 出版日期2015-1-15