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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
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Recent progress on the superconducting ion source VENUS.

J Y Benitez1, K Y Franzen, A Hodgkinson

  • 1Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA. jybenitez@lbl.gov

The Review of Scientific Instruments
|March 3, 2012
PubMed
Summary
This summary is machine-generated.

The VENUS ion source is operational after repairs and upgrades, achieving high-intensity bismuth beams for nuclear science and applications. This enhances heavy-ion driver capabilities and supports space radiation testing.

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Area of Science:

  • Nuclear Physics and Accelerator Science
  • Plasma Physics and Ion Source Technology

Background:

  • The 28 GHz Electron Cyclotron Resonance (ECR) Ion Source VENUS (versatile ECR for nuclear science) has resumed operation following critical repairs and system enhancements.
  • VENUS is a key research and development (R&D) device for exploring ECR source performance limits at 28 GHz and serves as an ion source for the 88-Inch Cyclotron.

Purpose of the Study:

  • To restore and enhance the operational capabilities of the VENUS ion source.
  • To investigate advanced ion production techniques, including ovens and sputtering, for diverse applications.
  • To support nuclear physics research, heavy-ion driver development, and space radiation effects testing.

Main Methods:

  • Repairs to superconducting sextupole leads and installation of a fourth cryocooler.
  • Utilizing a 10 kW gyrotron and optimized magnetic fields for 28 GHz ECR operation.
  • Development and testing of oven and sputtering techniques for various ion species production.
  • Experiments with bismuth to achieve high-intensity ion beams (Bi(31+)).
  • Integration of a low-temperature oven and sputter probes for enhanced beam cocktail production.

Main Results:

  • Successful restoration of VENUS operation with enhanced reliability and performance.
  • Demonstrated stable operation producing 300 eμA of Bi(31+) ions, relevant for heavy-ion drivers like FRIB.
  • Development of capabilities for producing multi-species cocktail beams essential for space radiation effects testing.
  • Ongoing studies on RF coupling into the source to further optimize performance.

Conclusions:

  • The VENUS ion source is now fully operational and enhanced, expanding its capacity for nuclear physics and applications.
  • Achieved significant ion beam intensities, positioning VENUS as a valuable asset for next-generation heavy-ion facilities.
  • The developed techniques for multi-species beam production are crucial for advancing space radiation research.