Accession Number : AD0847665

Title :   Ion Sources for the Production of Low Energy Beams.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Carter, Thomas Lee

Report Date : JUN 1968

Pagination or Media Count : 112

Abstract : Three ion sources for the production of low energy (E<500 eV) ion beams have been constructed and tested for use in atomic scattering experiments. Design parameters are given for construction and operation of the sources. Two gas sources, a duoplasmatron and an electron impact source, are capable of delivering beams of H(+), H2(+), H3(+), He(+), N(+), and N2(+), as well as other gas-derived ions, with beam intensities measured at a detector 75 cm downstream of approx. 0.2 microamperes/sq cm. Beam currents closely parallel Langmuir-Child space charge limited intensities. For the duoplasmatron, a full-width energy dispersion of 2-3% of the beam energy is observed. With hydrogen gas, beam composition of 34% H(+), 42% H2(+), and 24% H3(+) was achieved. Both gas sources require externally heated cathodes. The third source is a thermal device which produces lithium ion beams of approx. 0.1 microamperes/sq cm at a detector 75 cm away. The beam energy spread is a few tenths of an eV. (Author)

Descriptors :   (*ION BEAMS, SOURCES), HYDROGEN, HELIUM, NITROGEN, LITHIUM, SPACE CHARGE, INTENSITY, SCATTERING, GAS DISCHARGES, THESES.

Subject Categories : Particle Accelerators

Distribution Statement : APPROVED FOR PUBLIC RELEASE