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New progress of high current gasdynamic ion source (invited).

V Skalyga1, I Izotov1, S Golubev1

  • 1Institute of Applied Physics, Russian Academy of Sciences (IAP RAS), 46 Ul'yanova St., 603950 Nizhny Novgorod, Russia.

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Summary

A novel gasdynamic electron cyclotron resonance ion source (ECRIS) was developed, utilizing a quasi-gasdynamic confinement. This new ECRIS achieves high plasma density and efficient multi-charged ion beam production, particularly for hydrogen and deuterium.

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Area of Science:

  • Plasma Physics
  • Ion Source Technology
  • Nuclear Instrumentation

Background:

  • Conventional electron cyclotron resonance ion sources (ECRISs) have limitations in plasma confinement and density.
  • Geller's ECRIS confinement mechanism differs from the quasi-gasdynamic approach used in fusion mirror traps.

Purpose of the Study:

  • To develop and experimentally investigate a new type of ECRIS, termed the gasdynamic ECRIS.
  • To explore the quasi-gasdynamic confinement mechanism for enhanced plasma parameters.

Main Methods:

  • Experimental studies conducted at the Simple Mirror Ion Source (SMIS) 37 facility.
  • Plasma generation using 37.5 and 75 GHz gyrotron radiation with high microwave power (up to 100 kW).
  • Investigation of plasma density, electron energy, and ion beam characteristics at varying pressures (10^-4 - 10^-3 mbar).

Main Results:

  • Achieved significant plasma density (up to 8 × 10^13 cm^-3) due to high microwave frequency.
  • Produced high current (100-300 mA) multi-charged ion beams (Ar, Z=4-5) with high ionization degree and low ion energy.
  • Demonstrated effective formation of low emittance hydrogen and deuterium beams, including proton beams up to 500 emA with RMS emittance below 0.07 π ⋅ mm ⋅ mrad.

Conclusions:

  • The gasdynamic ECRIS offers a promising alternative to conventional ECRIS designs.
  • The quasi-gasdynamic confinement enables superior plasma density and efficient ion beam generation.
  • This technology is particularly effective for producing high-quality light ion beams for various applications.