Abstract
Recent investigations of pulsed gasdynamic ECR plasma resulted in development of a new type of electron cyclotron resonance ion source (ECRIS) – a so-called gasdynamic ECRIS - at the Institute of applied physics (IAP RAS). The main advantages of gasdynamic ECRIS are extremely high ion beam current in comparison with conventional classical ECRISs - current density up to 600 – 700 mA/cm2 in combination with low emittance i.e. normalized RMS emittance below 0.1 π·mm·mrad. Previous investigations were carried out in pulsed operation mode with 37.5 and 75 GHz gyrotron radiation plasma heating with power up to 100 kW at SMIS-37 experimental facility. While the pulsed operation of gasdynamic ion source was studied in details, CW operation of such device is not well investigated. The present work demonstrates results of the first experiments of gasdynamic ECRIS operation in CW mode. A test bench named SMIS-24 has been developed at IAP RAS. Microwave radiation of 24 GHz CW gyrotron with power up to 5 kW was used for plasma heating in a magnetic trap with simple mirror magnetic field configuration. Preliminary studies of plasma parameters were conducted using Langmuir probe and X-Ray spectrometry of bremsstrahlung. Ion beam was successfully extracted from the CW discharge. The experiments demonstrated plasma parameters similar to those obtained in pulsed mode at SMIS 37 facility. Three electron components were observed - “cold” fraction with energies on the order of helium ionization potential, “warm” fraction with energies in the range of 30-70 eV, which is optimal for low charge states production, and “hot” fraction with spectral temperature in the range of 10-20 keV. Plasma density found to be on the cut-off level, i.e. 6*1012 cm−3. A long-term reliable operation with ion current density >1 A/cm2 (estimated) was demonstrated. Obtained experimental results demonstrate that the main advantages of the gasdynamic ECR ion source are preserved when switching to CW operation.
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