Investigations on the interaction between the low energy heavy ion beams and hydrogen plasma

The investigations on the interaction between ion beam and matter is one of the most important topics in atomic physics and nuclear physics. It is indeed a requirement for a deeper understanding of the interaction processes. Especially the energy deposition by an intense heavy ion beam with the low energy impinging into a degenerate matter, which is related to the topics of warm dense matter, fast ignition process and helium ions selfheating in the fusion process..

Ion production by lasers using high-power densities in a near infrared region

Results are presented of experiments on ion production from Ta targets using a short pulse (350-600 ps in focus) illumination with focal power densities exceeding 1014 Wcm-2 at the wavelength of an iodine photodissociation laser (1.315 μm) and its harmonics. Strong evidence of the existence of tantalum ions with the charge state +45 near the target surface was obtained by X-ray spectroscopy methods. The particle diagnostics point to the existence of frozen high charge states (4 MeV) for the highest observed charge states. A tentative theoretical explanation of the observed anomalous charge state freezing phenomenon in the expanding plasma produced by a subnanosecond laser pulse is give

Energy Deposition and Excitation of Wakefield in Case of 100keV/u Ion Beam Passing through a Plasma Target

Recently our team investigated the energy deposition and excitation of wakefield in case of hundreds keV proton/helium ion beams passing a gas-discharged plasma target..

CERN PS laser ion source development

CERN, together with ITEP and TRINITI (Russia), is developing a CO2 laser ion source. The key design parameters are: 1.4 1010 ions of Pb25+ in a pulse of 5.5 ms, with a 4-rms emittance of 0.2 10-6 rad m, working at a repetition rate of 1 Hz. This device is considered as one candidate source for LHC heavy ion operation. The status of the laser development, the experimental set-up of the source consisting of the target area and its illumination, the plasma expansion area and extraction, beam transport and ion pre-acceleration by an RFQ, will be given

Transverse beam profile measurements for high power proton beams

High power proton accelerators (HPPA) projects are being proposed in fundamental and applied physics research: radioactive beam production, neutron sources, neutrino factories and transmutation. Among the parameters needed to be measured, the transverse beam profiles are the most difficult to obtain. A very attractive phenomenon is the production of visible light by the proton beam-background or additional gas interaction. Transverse beam profiles of the "SILHI" ECR source (95 keV, 100 mA) have been measured. The Doppler effect has been brought into operation to determine the energy and the spatial extension of the different components of the beam (H/sup +/, H/sub 2//sup +/, H/sub 3//sup +/). Wire scanners are also usable under low duty factor pulsed beam operation. Experiments have been conducted on tungsten, tantalum, titanium and carbon wires intercepting a 5 MeV proton beam delivered by the TANDEM accelerator of the Institut de Physique Nucleaire d'Orsay. Transverse beam profiles have been deduced from: back-scattered protons, X and gamma emission; and electric current collected in the wires