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Progress on MEVVA source VARIS at GSI.

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The vacuum arc ion source (VARIS) now produces high-current, high-charge state heavy ion beams, including record brilliance Uranium beams. Development focuses on enhanced materials and extraction systems for future research facility needs.

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Area of Science:

  • * Physics
  • * Accelerator Science
  • * Materials Science

Background:

  • * Vacuum arc ion sources (VARIS) are crucial for generating ion beams.
  • * Producing high-charge state heavy ions (e.g., U⁴⁺) presents significant challenges due to material properties.
  • * Advanced ion beam characteristics are essential for next-generation research facilities like FAIR.

Purpose of the Study:

  • * To enhance the production of high-current ion beams of heavy metals (Au, Pb, Bi) with high charge states (4+).
  • * To increase the beam brilliance of intense Uranium (U⁴⁺) beams by optimizing the extraction system geometry.
  • * To develop new middle-heavy projectiles and investigate operational parameters for improved performance and stability.

Main Methods:

  • * Utilized composite materials and alloys to improve cathode properties for heavy metal ion production.
  • * Implemented a new 7-hole triode extraction system, increasing voltage to 40 kV and optimizing beam aperture.
  • * Investigated the influence of auxiliary gases on production efficiency and operational stability.
  • * Optimized ion source parameters for maximum production efficiency and particle current.

Main Results:

  • * Achieved high current ion beams of Au, Pb, and Bi with the desired 4+ charge state.
  • * Attained record beam brilliance for U⁴⁺ beams, exceeding the Radio-Frequency Quadrupole (RFQ) space charge limit (15 mA).
  • * Successfully developed several new middle-heavy projectiles for the Facility for Antiproton and Ion Research (FAIR).

Conclusions:

  • * Composite materials and optimized extraction systems significantly improve heavy ion beam production and quality.
  • * The enhanced VARIS performance meets critical requirements for future heavy-ion research programs.
  • * Future development will focus on increasing the operation repetition rate to 2.7 Hz for maximum beam availability.