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Since 2009, the Spallation Neutron Source (SNS) has been producing neutrons with ion beam powers near 1 MW, which requires the extraction of ∼50 mA H- ions from the ion source with a ∼5% duty factor. The 50 mA are achieved after an initial dose of ∼3 mg of Cs and heating the Cs collar to ∼170 °C. The 50 mA normally persist for the entire 4-week source service cycles. Fundamental processes are reviewed to elucidate the persistence of the SNS H- beams without a steady feed of Cs and why the Cs collar temperature may have to be kept near 170 °C. [ABSTRACT FROM AUTHOR]

We built a cryogenic electron-beam ion source which is now in operation. We report some experiences and results of the start-up phase, which was aimed at producing beams of highly charged argon. In March 1989 the first ions were extracted and identified as argon 17 + using Donets' x-ray technique. In April we started performing diagnostics with a 90° double-focusing analyzing magnet to study the charge-state distributions. In June we extracted beams with fully stripped argon 18 + as the most abundant argon charge state. [ABSTRACT FROM AUTHOR]

Investigates the production of highly charged ion beams with an electron beam ion source. Effect of the ion-confining downstream dam voltage on the ions; Reduction of the energy spread of the ions by elevating the main trap voltage; Generation of intense ion bunches through the combination of microbunching and direct current batch mode expulsions.

The CRYogenic electron beam ion source at Kansas State University has been in operation since spring 1989. It produces up to Ar[sup 18+], Kr[sup 34+], and Xe[sup 44+] on a regular basis. Acceleration tubes and a beamline system were added during 1990. The ion source is mounted on a high voltage platform, which can be used to vary the ion energies between 2 and 200 kV per charge. The extraction-, analyzing-, and beamline systems were designed to accept a wide range of ion masses and charge states with the mass energy product (M·E/q²) stretching over four orders of magnitude. The system is used to study the low-energy highly charged ions interacting with electrons, atoms, thin foils, and surfaces. [ABSTRACT FROM AUTHOR]