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A new extraction system for the Linac4 H- ion source.

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The Linac4 ion source, designed for CERN, experienced breakdowns at higher voltages due to electron dump evaporation. A new extraction system design is being developed and simulated to address this for improved performance.

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Area of Science:

  • Particle Accelerators
  • Plasma Physics
  • Ion Source Technology

Background:

  • The CERN accelerator complex upgrade includes Linac4, a new linear accelerator for H(-) ions.
  • The ion source is based on the DESY RF-driven source, aiming for 80 mA current at 45 keV.
  • Initial commissioning at 35 kV was successful, but higher voltages caused issues.

Purpose of the Study:

  • To present results from the H(-) ion source commissioning at 35 kV.
  • To investigate and address high voltage breakdowns occurring at 45 kV.
  • To simulate a new pulsed extraction system for 45 kV operation.

Main Methods:

  • Commissioning of the H(-) ion source at 35 kV extraction voltage.
  • Analysis of high voltage breakdowns attributed to electron dump material evaporation.
  • Development and simulation of a novel pulsed extraction and electron dumping system.

Main Results:

  • Successful commissioning of the ion source at 35 kV extraction voltage.
  • Identification of electron dump material evaporation as the cause of breakdowns at 45 kV.
  • Simulations indicate the feasibility of a new extraction system for 45 kV operation.

Conclusions:

  • The non-caesiated RF-driven H(-) ion source is capable of operation at 35 kV.
  • High voltage breakdowns at 45 kV necessitate a redesigned extraction and electron dumping system.
  • Simulations show promise for a new pulsed extraction system to achieve the target 45 kV beam extraction.