Coaxial Magnetic Field Research Articles

On some properties of the radio frequency ion source with longitudinal magnetic field

A description is given of a radio frequency ion source of the Thoneman type, but with a coaxial magnetic field. It is shown that with proper choice of the measured variables simple straight line plots are obtained which can be given easy interpretation and be useful in further developments. Some limitations of this type of source are also shown.

Space Charge Waves along Magnetically Focused Electron Beams

The propagation of perturbations along electron beams of finite diameter is determined by boundary conditions. The solutions of the problem-the phase-eigenvalues or the plasma frequency reduction factor-depend on the way the perturbations of the beam surface are taken into account. A cylindrical uncompensated beam (void of ions) confined by an arbitrary coaxial magnetic field is considered. Two different procedures are compared: one assuming a surface current, the other introducing additional but continuous ac space charges and currents over the beam cross section.

A Magnetic Ion Source of Capillary Arc Type

In the quartz capillary part (8mm φ, 10cm in length) of this ion source with a coaxial magnetic field of about 800 gauss, an intense ionization is established by a collimated primary electron beam sent from one end of the capillary. No metal part being contained in the capillary, a high relative concentration of atomic hydrogen is obtained, so that the proton percentage of the ion beam extracted from the other end of the capillary is very large (60∼70%) A proton output up to 1mA is obtained from a 1.3mm hole with a small consumption of power (<200 watts) and hydrogen gas (∼3cc per hour N.T.P.). The ratio of protons to consumed gas molecules is 10∼20%.

Some Characteristics of Arc Discharge in a Coaxial Magnetic Field

Some Characteristics of Arc Discharge in a Coaxial Magnetic Field