Plasma diagnostics at electron cyclotron resonance ion sources by injection of laser ablated fluxes of metal atoms
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چکیده
Short pulses of neutral particles generated by laser ablation of metal targets have been injected into the Frankfurt 14 GHz electron cyclotron resonance ~ECR! ion source. Rise/fall times of pulses of highly charged ions of Cd and Mg were registered as a function of microwave power and gas pressure. From a comparison of the measured data to numerical simulations, values of the electron density and the temperature in the ECR plasma were estimated to be about 0.75310 cm and a few keV. The effective electron temperature increases with increasing microwave power and decreases with increasing gas pressure. The electron density is only a weak function of the microwave power, but increases significantly with the gas pressure. In the Ar/O2 gas-mixing mode of operation, an improved confinement of lowly charged ions was observed. © 2001 American Institute of Physics. @DOI: 10.1063/1.1361087#
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