C Niemann et al 2003 J. Phys. D: Appl. Phys. 36 2102 doi:10.1088/0022-3727/36/17/313
C Niemann1,4, F B Rosmej1, A Tauschwitz1, S Neff1, D Penache1, R Birkner1, C Constantin1,4, R Knobloch1, R Presura1,5, D H H Hoffmann1, S S Yu2 and R W Lee3
Show affiliationsHigh-current discharge channels are ideally suited for the focusing and transport of intense charged particle beams. The azimuthal magnetic field provides a strong focusing force, which acts symmetrically towards the discharge axis. A sufficiently dense and hot plasma can also neutralize the beam current and space charge of very intense ion beams, relevant to a number of future applications. In this paper we present experiments on high-current discharge channels designed for the transport of heavy ion beams. A spectroscopic method is introduced, which allows us to determine both the plasma temperature and density in hydrogen–nitrogen plasmas, from comparisons of the measurements with computer calculations. The temperature is derived from a comparison of experimentally obtained relative nitrogen-line intensities with a collisional radiative rate modelling of the nitrogen plasma. The electron density is determined by a detailed line shape analysis of the Stark-broadened hydrogen Balmer lines.
52.25.Kn Thermodynamics of plasmas
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
Issue 17 (7 September 2003)
Received 25 March 2003
Published 20 August 2003
C Niemann et al 2003 J. Phys. D: Appl. Phys. 36 2102