Compact ECR ion sources with permanent magnets in a cusp geometry and in a magnetic mirror structure

Conference · Mon Jan 01 04:00:00 EST 1990 · Review of Scientific Instruments; (USA)

OSTI ID:6908364

Delaunay, M ^[1]

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1. Commissariat a l'Energie Atomique, Centre d'Etudes Nucleaires de Grenoble, Departement de Recherche Fondamentale, 85 X, 38041 Grenoble Cedex, France (FR)

Two compact Electron Cyclotron Resonance (ECR) ion sources exclusively built with permanent magnets in a cusp geometry and in a magnetic mirror structure are compared. The microwave discharge power is 60--120 W at a frequency of 2.45 GHz. The cusp structure enables to produce an argon-ion current of 1.5 mA at an extraction voltage of 2 kV with an aperture of 4 mm diameter at a gas pressure of 10{sup {minus}3} mbar. The ion source built with a magnetic mirror operates at lower pressure (10{sup {minus}4} mbar) with an ion current density of 5 mA/cm{sup 2} (the total current is 0.6 mA). Spectroscopic measurements of photons emitted by an oxygen plasma enable us to detect multicharged ions such as O{sup 4+} and O{sup 5+} ions. With these two magnetic structures, sharp variations of current density with gas flow rates are observed and the different ranges of operating pressure are presented.

• OSTI ID: 6908364
• Report Number(s): CONF-890703--
• Conference Information: Journal Name: Review of Scientific Instruments; (USA) Journal Volume: 61:1
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430301* -- Particle Accelerators-- Ion Sources
ARGON IONS
BEAM EXTRACTION
CHARGED PARTICLES
CONTROL
CYCLOTRON RESONANCE
ELECTROMAGNETIC RADIATION
ELECTRON CYCLOTRON-RESONANCE
ION SOURCES
IONS
MAGNETIC MIRRORS
MAGNETS
MICROWAVE RADIATION
OPEN PLASMA DEVICES
OPERATION
PERMANENT MAGNETS
PLASMA
PRESSURE CONTROL
RADIATIONS
RESONANCE
THERMONUCLEAR DEVICES