Intense Ion Beam Neutralization Using Underdense Background Plasma

Abstract

Producing a dense background plasma for neutralization purposes is experimentally difficult and requires a large amount of energy. We show that even an underdense background plasma with a small relative density can achieve high neutralization of intense ion beam pulses. Using particle-in-cell simulations, we show that if the total plasma electron charge is not comparable to the beam charge, electron emitters are necessary for effective neutralization, but are not needed if the plasma volume is large. Several plasma densities are investigated, including the case of electron emitters without plasma, which does not effectively neutralize the beam. Over 95% neutralization is achieved for even very underdense background plasma. We compare with an analytic model of neutralization and find close agreement with the particle-in-cell simulations. Further, we show experimental data from the NDCX-II group that verifies the result that underdense plasma can neutralize intense heavy ion beams effectively.

5 pages, 6 figures

References in corpus (1)

• Long-time evolution of magnetic fields in relativistic GRB shocks

Cited by in corpus (4)

• Amplification due to Two-Stream Instability of Self-Electric and Magnetic Fields of an Ion Beam Propagating in Background Plasma
• Generation of forerunner electron beam during interaction of ion beam pulse with plasma
• Neutralization of ion beam by electron injection, Part 1: Accumulation of cold electrons
• Excitation of electrostatic solitary waves and surface waves in ion beam neutralization process