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First operation in SPIDER and the path to complete MITICA.

G Serianni1, V Toigo1, M Bigi1

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ITER neutral beam injectors require 1 MeV, 40 A negative deuterium ion current for 1 hour, a goal not yet met. The Neutral Beam Test Facility (NBTF) was established to address these challenges with SPIDER and MITICA experiments.

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Area of Science:

  • Nuclear Fusion Engineering
  • Plasma Physics

Background:

  • ITER requires high-performance neutral beam injectors for plasma heating.
  • Previous attempts to meet ITER's neutral beam requirements have faced challenges.
  • A dedicated Neutral Beam Test Facility (NBTF) was established at Consorzio RFX.

Purpose of the Study:

  • To describe the status and progress of the SPIDER and MITICA experiments at the NBTF.
  • To detail the operational achievements and challenges of the SPIDER ion source prototype.
  • To report on the procurement, timeline, and initial voltage holding tests for the MITICA injector prototype.

Main Methods:

  • Operation and characterization of the SPIDER ion source.
  • Procurement and assembly of the MITICA injector components.
  • Voltage holding tests and experiments on the MITICA accelerator.

Main Results:

  • SPIDER successfully operated for its first year, addressing radiofrequency power and source operation issues.
  • Initial characterization of the first negative ion beam from SPIDER was achieved.
  • Procurement and timeline for MITICA are on track, with initial voltage holding tests underway.

Conclusions:

  • The NBTF, with SPIDER and MITICA, is making progress towards meeting ITER's neutral beam injector requirements.
  • SPIDER's operational experience provides valuable insights for optimizing ion source performance.
  • MITICA's development is crucial for addressing accelerator-related challenges, including voltage holding.