Production of a high proton yield beam in a semi-cylindrical plasma generator
Abstract
A semi-cylindrical plasma generator whose dimensions are 34 cm in inner diameter and 129 cm in length has been developed for use in JAPAN-FRANCE collaborative experiment on the energy recovery. The 3D computer code for the magnetic field distribution and the electron orbits was utilized to obtain a high proton ratio and a good uniformity of plasma. Plasma spatial uniformities were measured with Langmuir probes. The plasma uniformity of +/- 5 percent was obtained in the measured region of 8 cm x 100 cm at the arc current of 900 A. Hydrogen beams were extracted from a central area of 7 cm x 27 cm and ion species were measured by the Doppler shifted spectroscopy. The results show that the proton ratio became higher: (1) at higher arc current; (2) at the magnetic field distributions which confine the electrons strongly; and (3) at the magnetic field distribution in which the electrons orbits are far from the beam extraction region. The proton ratio of 93 percent was obtained in the case where the plasma uniformity was as good as +/- 5 percent in the area of 8 cm x 100 cm. The highest proton ratio of 95 percent was obtained with a strongly linked magnetic field distribution.
- Publication:
-
Unknown
- Pub Date:
- December 1990
- Bibcode:
- 1990phpy.rept.....W
- Keywords:
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- Computer Programs;
- Cylindrical Plasmas;
- Electrons;
- Electrostatic Probes;
- Magnetic Field Configurations;
- Plasma Generators;
- Proton Beams;
- Proton Density (Concentration);
- Protons;
- Electron Orbitals;
- Hydrogen;
- Magnetic Fields;
- Spectroscopy;
- Plasma Physics