Focusing of high-current, large-area, heavy-ion beams with an electrostatic plasma lens

Journal Article · Sun Aug 01 04:00:00 EDT 1999 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.124551· OSTI ID:357263

Goncharov, A A; Protsenko, I M ^[1]; Yushkov, G Y ^[2]; Brown, I G ^[3]

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1. Institute of Physics of NASU, 46 Prospect Nauki, Kiev-39, 252650 (Ukraine)
2. High Current Electronics Institute, Tomsk 634055 (Russia)
3. Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720 (United States)

We report on measurements of the focusing of high-current, large-area beams of heavy metal ions using an electrostatic plasma lens. Tantalum ion beams were formed by a repetitively pulsed vacuum arc ion source, with energy in the 100 keV range, current up to 0.5 A, initial beam diameter 10 cm, and pulse length 250 {mu}s. The plasma lens was of internal diameter 10 cm and length 20 cm, and had nine electrostatic ring electrodes with potential applied to the central electrode of up to 7 kV, in the presence of a pulsed magnetic field of up to 800 G. The current-density profile of the downstream, focused, ion beam was measured with a radially moveable, magnetically suppressed, Faraday cup. The tantalum ion-beam current density at the focus was compressed by a factor of up to 30. The results are important in that they provide a demonstration of a means of manipulating high-current ion beams without associated space-charge blowup. {copyright} {ital 1999 American Institute of Physics.}

• OSTI ID: 357263
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 7 Vol. 75; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BEAM FOCUSING MAGNETS
BEAM NEUTRALIZATION
CURRENT DENSITY
ELECTRODES
ELECTROSTATIC LENSES
HEAVY IONS
ION BEAMS
KEV RANGE 100-1000
MAGNETIC FIELDS
PLASMA
SPACE CHARGE
TANTALUM
TANTALUM IONS