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Advanced ASDEX Upgrade pellet guiding system design.

B Ploeckl1, H Köhnlein1, T M J Engelhardt2

  • 1Max Planck Institut für Plasma Physik, Boltzmannstr. 2, 85748 Garching, Germany.

The Review of Scientific Instruments
|September 3, 2020
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Summary

Future fusion power plants will use cryogenic pellet injection. A new ASDEX Upgrade guiding tube design using clothoid curves improves pellet performance by ensuring continuous curvature for optimal fueling.

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Area of Science:

  • Nuclear Fusion Engineering
  • Plasma Physics
  • Materials Science

Background:

  • Cryogenic pellet injection is crucial for fueling future fusion power plants.
  • High-field side injection in tokamaks is essential for optimal fueling performance.
  • The ASDEX Upgrade tokamak utilizes cryogenic hydrogen pellet injection at speeds up to 1000 m/s.

Purpose of the Study:

  • To design and implement an improved pellet guiding tube for the ASDEX Upgrade tokamak.
  • To enhance cryogenic pellet injection performance by optimizing the guiding tube geometry.
  • To provide insights for future fusion device pellet guiding tube designs.

Main Methods:

  • A novel geometry concept inspired by civil engineering (e.g., railroad track design) was applied.
  • The new design incorporates clothoid shape sections for continuous track curvature.
  • The guiding tube features a 270° looping turn with a 17 m path length and rectangular cross-section.

Main Results:

  • The new design ensures continuous curvature, unlike the previous elliptical sections with discontinuous curvature.
  • The improved geometry facilitates smoother pellet transitions within the guiding tube.
  • The advanced design is expected to enhance the pellet launching system performance on ASDEX Upgrade.

Conclusions:

  • Continuous curvature in pellet guiding tubes is vital for improved performance in fusion devices.
  • Clothoid curves offer a superior design approach for pellet guiding tubes compared to discontinuous elliptical sections.
  • This research contributes valuable knowledge for the development of advanced fueling systems in future fusion power plants.