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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
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Radio frequency-driven proton source with a back-streaming electron dump.

Q Ji1, A Sy, J W Kwan

  • 1Lawrence Berkeley National Laboratory, 1 Cyclotron Road, MS 5R0121, Berkeley, California 94720, USA. qji@lbl.gov

The Review of Scientific Instruments
|March 3, 2010
PubMed
Summary
This summary is machine-generated.

This study presents a radiofrequency (rf) ion source with an integrated electron dump, achieving high hydrogen ion current density. The design enhances plasma generation and cooling for efficient ion extraction.

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Area of Science:

  • Plasma Physics
  • Ion Source Technology
  • Surface Engineering

Background:

  • Radiofrequency (rf) ion sources are crucial for various applications, including materials processing and particle acceleration.
  • Efficient generation and extraction of hydrogen ions require optimized plasma confinement and thermal management.
  • Existing designs often face challenges with antenna heating and electron back-streaming.

Purpose of the Study:

  • To describe a novel rf ion source design incorporating a back-streaming electron dump.
  • To evaluate the performance of the new design in terms of hydrogen plasma generation and ion current density.
  • To assess the effectiveness of integrated cooling mechanisms for key components.

Main Methods:

  • A quartz tube and plate assembly was utilized, with rf power coupled via an external planar antenna.
  • A water-cooled metal plug was integrated as a back-streaming electron dump.
  • The antenna was bonded to a water-cooled quartz window to manage thermal load.

Main Results:

  • The rf ion source successfully generated hydrogen plasma using 13.6 MHz power.
  • The bonded, water-cooled antenna significantly reduced operational temperature.
  • A current density of approximately 125 mA/cm(2) for extracted hydrogen ions was achieved at 1800 W power.

Conclusions:

  • The developed rf ion source with a back-streaming electron dump demonstrates efficient hydrogen ion generation.
  • The integrated cooling solutions effectively manage thermal stress on the antenna and electron dump.
  • The high current density achieved indicates the potential of this design for demanding applications.