Space-charge neutralization of heavy ion beams via electron injection

✍ Scribed by Linchun Wu; George H. Miley; Hiromu Momota

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 264 KB
• Volume: 544
• Category: Article
• ISSN: 0168-9002
• DOI: 10.1016/j.nima.2005.03.017

✦ Synopsis

One key issue in heavy ion beam fusion (HIBF) is how to effectively focus high-current and high-perveance ion beams onto a small target area. Space charge neutralization is needed to prevent defocusing as the ion density compresses during focusing. The present study is concerned with the physics of space-charge neutralization by use of various concepts for injection of electrons into the ion beam in addition to plasma neutralization. To date the most widely studied approaches to neutralization use a preformed plasma or ionize a background gas in the beam line. However, these schemes alone face difficulties due to local non-uniformities in charge neutralization due to beam dynamic/ focusing effects. Thus, two supplemental techniques are under study and will be discussed here. One involves axially injection of electrons created in a thin foil in the beam path. The other uses a magnetic field to guide the electrons into the direction of the beam path. Both techniques would be used in combination with conventional background plasma, providing added control of neutralization.