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Abstract : All available charge state measurements for heavy ions in dilute gases and carbon foils at equilibrium or near-equilibrium conditions have been analyzed to improve semi-empirical formulas for the distribution parameters. Each experimental distribution was fit to an asymmetric function F q = Fm : exp {— 0.5 t2-1 + εt }, where t = q — q0-ρ and q0 is the maximum intensity charge value. Subsequent fits of the resultant distribution parameters q0, p, and ε to empirical functions of projectile charge and velocity yielded rms deviations of about 0.5 for q 0, 4 % for q0-Z, 5-7 % for p, and 0.03 for ε-ρ. The asymmetric distribution gives substantial improvement over previous expressions for prediction of small Fq values for heavy ions in dilute gases.

Keywords : carbon charge exchange ion beams ion sources particle accelerator accessories dilute gases distribution parameters asymmetric function maximum intensity charge value projectile charge velocity yielded RMS deviations semiempirical formulas heavy ion stripping data C foils

Autor: R.O. Sayer



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