Numéro
J. Phys. Colloques
Volume 50, Numéro C1, Janvier 1989
International Conference on the Physics of Multiply Charged Ions and International Workshop on E.C.R. Ion Sources
Page(s) C1-783 - C1-789
DOI https://doi.org/10.1051/jphyscol:1989184
International Conference on the Physics of Multiply Charged Ions and International Workshop on E.C.R. Ion Sources

J. Phys. Colloques 50 (1989) C1-783-C1-789

DOI: 10.1051/jphyscol:1989184

PHYSICS OF MULTIPLY CHARGED OXYGEN IN THE CONSTANCE B QUADRUPOLE MIRROR

C.C. PETTY, D.L. GOODMAN, D.K. SMITH and D.L. SMATLAK

Plasma Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139, U.S.A.


Abstract
Detailed experimental measurements of multiply-chargered ion densities, endloss currents,and temperatures have been made in a single cell quadrupole mirror. The purpose of these experiments is to determine the confinement physics of ions over a range of charge states in an ECR ion source. The parallel ion confinement times agree well with a theoretical model including Pastukhov and flow confinement for a potential dip of φi/Ti ~ 1. The ion endloss currents were found to be up to 50% hollow. Radial transport of ions'was found to be important in limiting the extraction of high charge state ions. In addition, by heating O4+ with ion cyclotron resonance heating we were able to increase its extracted current in the plasma center by 25%.