Large-Angle Xenon Ion Scattering in Xe-Propelled Electrostatic Thrusters: Differential Cross Sections; Journal article

摘要

Elastic scattering between xenon ions and xenon atoms can produce ion currents at large angles with respect to the axis of electro- static thrusters. Differential scattering cross sections are needed to properly predict off-axis currents that can cause significant material erosion due to sputtering. Guided-ion beam differential cross section measurements are presented for Xe(exp +) + Xe and Xe(exp 2+) + Xe elastic scattering at labora tory ion energies between 5 and 40 eV per ion charge. For the singly charged system, the experimental absolute differential cross sections are in excellent agreement with classical elastic scattering calculations based on the most recent ab inttio ion-atom interaction potentials. The measure- ments for the doubly charged system are used to derive an approximate effective Xe(exp 2+) - Xe interaction potential. The potentials are used to calcu late absolute differential cross sections for both ion charge states at a typical Hall thruster ion of 270 eV per unit charge. The differential cross sections for the doubly charged ions are approximately a factor of 3 smaller than those of the singly charged system at large scattering angles. The importance of doubly charged ions with respect to material erosion is discussed on the basis of known sputtering yields as a function of ion energy for molybdenum and boron nitride. It is concluded that at typical charge-state ratios, doubly charged ions only have an impact at scattering angles where the scattered ion energy in the laboratory (thruster) frame of reference is low and the sputtering yields depend very strongly on ion energy.