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High-current H2 + beams from a filament-driven multicusp ion source.

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  • 1Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139, USA.

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A new multicusp ion source, MIST-1, achieved record 1 mA steady-state H2+ currents with 80% purity. This breakthrough supports the IsoDAR neutrino experiment

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Area of Science:

  • Particle Accelerators
  • Plasma Physics
  • Nuclear Physics

Background:

  • The IsoDAR experiment requires high-purity, high-current proton beams for neutrino discovery.
  • Existing ion sources face challenges in meeting the stringent beam requirements for IsoDAR.
  • Multicusp ion sources offer potential for high brightness and purity.

Purpose of the Study:

  • To develop and test a new multicusp ion source (MIST-1) for the IsoDAR experiment.
  • To achieve record steady-state currents of H2+ with high purity.
  • To validate the performance of MIST-1 for RFQ direct injection.

Main Methods:

  • Systematic measurements of MIST-1 performance by varying discharge voltage, current, and gas pressure.
  • Characterization of beam emittance and species purity.
  • Comparison of experimental results with high-fidelity simulations.

Main Results:

  • MIST-1 produced record 1 mA steady-state H2+ current with 80% purity.
  • Optimal operating regime identified at low pressure, high discharge current, and high voltage.
  • Measured combined species emittance <0.05 π-mm-mrad (rms, normalized) for a 0.95 mA beam.
  • Experimental results show good agreement with simulations.

Conclusions:

  • MIST-1 demonstrates the feasibility of using multicusp ion sources for IsoDAR.
  • The source design and performance pave the way for 5 mA H2+ (10 mA proton equivalent) continuous wave beams.
  • This advancement is crucial for compact cyclotrons and underground physics experiments.