Multiampere negative ion source development at Novosibirsk (invited)

Abstract

Results on multiampere negative ion (NI) sources with a surface-plasma mechanism of negative ion production are presented. Several types of surface-plasma sources (SPS)—Honeycomb semiplanotrons and hollow-cathode Penning source—are reviewed. The data on SPS H−(D−) production with average NI current density in the beam up to 0.1 A/cm2 is presented. The properties of high-current glow hydrogen–cesium discharge that produces a large-area, thin layer of plasma and provides the necessary components for intense negative ion emission and collecting (low work function coverage, electric and magnetic field distribution across the plasma, current composition to NI emitter) are analyzed. Data on efficiency and contribution of different channels of surface-plasma NI production are presented.

Accelerator-based neutron source for the neutron-capture and fast neutron therapy at hospital

“…The value measured for the normalized emittance of 0.3 π mm mrad meets the requirements. Negative ion source with Penning geometry electrodes and power supply is being fabricated (Belchenko, 2004).…”