1.
Rev Sci Instrum
; 85(2): 02B124, 2014 Feb.
Artigo
em Inglês
| MEDLINE
| ID: mdl-24593564
RESUMO
Uniform axial magnetic field of about 70 G is applied to a radiofrequency (rf) hydrogen ion source by arrays of permanent magnets. The plasma density and electron temperature downstream of the source and near the magnetic filter are compared with those in the previously described ion source, where the axial field has been applied by two solenoids. The source is operated at â¼350 kHz and above 10 kW rf power with a field-effect-transistor-based invertor power supply in 1.5 Pa hydrogen. The results show that the plasma density of â¼10(19) m(-3) near the source exit and â¼10(18) m(-3) near the magnetic filter can be obtained, which are higher than those with the solenoids.