J.-C. Gauthier, et al.
J. Phys. IV France 133 (2006) 757-759
Electron loss cross sections of fluorine negative-ion projectile for modeling of inertial confinement fusionM.M. Sant'Anna, F. Zappa, A.C.F. Santos, A.L.F. de Barros, W. Wolf, L.F.S. Coelho and N.V. de Castro Faria
Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, Rio de Janeiro, RJ 21941-972, Brazil
Negative ion beams have been proposed as drivers for inertial confinement fusion (ICF), as high-velocity neutral projectiles produced by photodetachment may efficiently impact and heat up a hydrogen pellet target. Charge-changing cross sections are henceforth needed to estimate the beam attenuation in the residual gases. In this work we analyse cross section measurements for the several electron-loss collision channels of fluorine anions impinging on argon (10-50 keV/u energy range) and producing charge states from Ar+ to Ar4+. Cross sections for projectile destruction associated to target ionization rise steeply with velocity, displaying a clear energy threshold. This threshold is characteristic of a collision process involving direct interaction between a projectile electron and a target electron.
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