Antimony ion source

Abstract

Abstract PURPOSE:To extract Sb ion by using eutectic alloys of two or more elements such as Sb and Au or Zn, Pb, Cu as ion source keeping low steam pressure in molten state utilizing the difference in the intensity of field emission. CONSTITUTION:The weight of Au and Sb are determined to make a predetermined composition. Au wire 7 is wound around tungsten filament 6 to make a spiral basket and Sb8 wrapped by the Au wire is held by a ceramic 5. When current is applied to the filament 6 to heat up the Au wire 7 and the Sb wire 8, the alloy begins to form at a contact surface and finally the alloy of prefixed composition is obtained. When electric field is applied to the molten metal through outside electrodes 9, the field emission is obtained only at the Sb ion. Using this ion source, the Sb ion seed of large current can be extracted through a fine hole with a very little scattering of energy by the field emission. The Sb ion beam can be focused by a lens.

Inventors

• 👤 Takehisa Yashiro

Bibliographic Details