A new, ohmic-heating based thermal ionization cavity source for mass spectrometry

We present a new, ohmic-heating based, thermal ionization cavity source for mass spectrometry. We employ independent control of ionization and evaporation to keep sample in the evaporator while increasing the temperature of the ionizer. The ‘cold end’ phenomenon is eliminated by using optimized blade-shaped connection electrode. We simulated the processes of ionization and transition in the ion source using SIMION program based on Monte Carlo method and obtained spatial and kinetic energy distribution data for the atoms and ions at the outlet of the ionizer. We demonstrate considerable improvements in the extraction and transmission efficiency of the ion optics system. The total efficiencies achieved for uranium were 0.5–2% and the estimated ionization efficiencies - 3–7%. For plutonium, these values were 4–9% and 20–60%, respectively.

Figure optionsDownload high-quality image (301 K)Download as PowerPoint slideHighlights
► A New, ohmic-heating based thermal ionization cavity source for mass spectrometry is developed.
► High total efficiency achieved for uranium and plutonium.
► The Extraction and transmission of ions improved with special design and simulation.