ALEXIS - upgrade

• increasing the length of the ALEXIS device from 60 cm to 180 cm
• improving the stablity of plasma operations
• enhancing the reproducibility of experiments

A photographic record showing the upgrade process for ALEXIS can be found HERE.

• Plasmas generated in helium and argon
• Array of 3, 0.25 mm diameter heated tunsten filaments used to generate the plasma
• 4" inner diameter (100 mm) vacuum vessel
• 16 channel, 16 bit, 1 MHz, IoTech WaveBook 516 used for data acquisition
• Diagnostics and experimental features:
  • Single Langmuir probes (density, floating potential, ion saturation current, fluctuations)
  • Triple Langmuir probes (density, electron temperature, ion saturation current)
  • Emissive probes (plasma potential)
  • Emission spectroscopy (density, fluctuations)
  • Ring array (modifies potential structure and field aligned current in the plasma)

Operational Conditions