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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
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Low-energy dc ion source for low operating pressure.

Efim Oks1, Maxim Shandrikov1, Cecilia Salvadori2

  • 1Institute of High Current Electronics, Russian Academy of Sciences, Akademichesky ave. 2/3, Tomsk 634055, Russia.

The Review of Scientific Instruments
|September 1, 2014
PubMed
Summary
This summary is machine-generated.

This study details a novel ion source using a Penning discharge and hollow cathode. It achieved lower operating voltages and significant ion currents for argon and hydrogen.

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Area of Science:

  • Plasma Physics
  • Ion Source Technology
  • Vacuum Engineering

Background:

  • Penning discharges are utilized in various applications requiring ion beams.
  • Cold hollow cathodes offer potential advantages in discharge stability and efficiency.
  • Optimizing ion source performance is crucial for applications like mass spectrometry and particle accelerators.

Purpose of the Study:

  • To investigate the performance of an ion source employing a Penning discharge with a cold hollow cathode.
  • To determine the optimal operating pressures and voltages for efficient ion generation.
  • To characterize the ion beam properties, including current and current density.

Main Methods:

  • Experimental setup utilizing a Penning discharge with a cold hollow cathode in crossed electric and magnetic fields.
  • Measurement of minimum operating pressures for argon and hydrogen.
  • Characterization of discharge current-voltage (I-V) curves.
  • Measurement of ion beam current and on-axis current density at various operating conditions.
  • Investigation of pressure effects on discharge parameters and temporal stability.

Main Results:

  • Minimum operating pressures established at 3 × 10⁻⁵ Torr (argon) and 5 × 10⁻⁵ Torr (hydrogen).
  • Hollow cathode enabled reduced discharge operating voltage to 350 V at ~100 mA discharge current.
  • Achieved ion currents of 2.5 mA (argon) and 8 mA (hydrogen) at 2 kV accelerating voltage.
  • On-axis current densities measured at 170 μA/cm² (argon) and 450 μA/cm² (hydrogen).
  • Radial ion beam current density distribution and discharge characteristics were documented.

Conclusions:

  • The cold hollow cathode Penning discharge ion source demonstrates efficient ion generation at reduced voltages.
  • The source exhibits promising performance for both argon and hydrogen ions, with higher current densities for hydrogen.
  • Further investigation into pressure dependencies and temporal stability is warranted for optimizing source operation.