Simple, high current, antimony ion source.
A simple metal ion source capable of producing a continuous, uncontaminated, high current beam of Sb ions is presented. It produced a total ion current of 200 muA at 1 kV extraction voltage. A discharge occurred in the source at a pressure of 6x10(-4) Torr. The ion current extracted from the source increased with the 3/2 power of the extraction voltage. The perveance of the source and ion density in the plasma were 8x10(-9) and 1.8x10(11) cm(-3), respectively.
High Efficiency Source for Metal Ions
An ion source is described which produces beams of ions of both high and low vapor pressure materials. The source has the following characteristics which make it suitable for accelerator applications or laboratory ion beam experiments where the large size and complexity of isotope separator ion sources would be a disadvantage: (1) small size, (2) simplicity of construction and operation, (3) long filament life, (4) high charge utilization efficiency, (5) wide operating temperature range, (6) relatively modest power requirement, (7) ability to operate efficiently on either gas or solids. The source operates by electron bombardment ionization of the vapor of the charge material. The vapor is obtained by heating the charge to a sufficiently high temperature to achieve the proper source operating pressure. A unique feature of this source is the combination of the discharge chamber and charge container into one chamber. The operating temperature range of the source is from approximately 300 to about 1600°C. Be...
Multimomentum 650 mA ion source
A high-current well-focused multimomentum source of molecular ions has been developed as part of a high-energy energy-spread injection system. The multimomentum injection system is designed to produce a trapped plasma with continuous distributions of momenta and energies in order to reduce velocity-space instabilities. The ion source beam was delivered at 16-20 keV. It was composed of nine or more different species of molecular and atomic ions of hydrogen, deuterium and other gases which were extracted and focused identically and simultaneously. Maximum beam divergence was 2° from the beam axis. Average beam intensity was 130 mA/cm2 in a 2 cm dia. beam 40 cm from the source. Electrostatic focusing was accomplished by an array of 6 mm dia. accel-decel extraction and focusing apertures. The beam was 85% composed of molecular ions, of which either the diatomic or triatomic component could be maximized by an adjustment of the gas fed to a reflex arc. Operating with a mixture of hydrogen and deuterium gas, the relative intensities of the several mass-to-charge ratio beam components indicated a random distribution of protons and deuterons.