Recent Results from the LIZ-MeV Ion Source

摘要: LIZ-MeV (Low Inductance Z-discharge of Metal Vapor) is a magnetized Z-pinch ion source. It is basically a pseudo-spark device from which recently an intense current (Several kA) of gold ions was extracted. The charge-state distribution indicates a range in gold ion charge state from+ 4 to+ 19. Excluding all possible impurities from time-of-flight (TOF) measurements, strongly suggest that charge states at least as high as Au 12+ were generated. Various TOF spectra will be presented. Although the results are preliminary, this device has a great potential to exceed available ion sources. Existing heavy-ion sources can produce either high beam currents, but low charge states (eg, the Metal-Vapor Vacuum Arc [MEVVA]) or high charge states, but low beam currents (eg, the Electron Beam Ion Source [EBIS]). For ion beam injection our goal has been to develop an ion source that produces both high charge states and high beam currents. LIZ-MeV has sufficiently large electron impact energies and electron current densities. We hope to add another z-pinch stage that is characterized by longer confinement times for high charge state generation, while minimizing charge state reducing processes. Thus, we hope to eventually produce large currents of highly ionized heavy metal ions for accelerator applications.