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Beam-line diagram of the Ion Source Test Facility (ISTF) apparatus in which the experiment is conducted (all units of measurement are in mm).

Beam-line diagram of the Ion Source Test Facility (ISTF) apparatus in which the experiment is conducted (all units of measurement are in mm).

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Figure 1. Beam-line diagram of the Ion Source Test Facility (ISTF)...
Figure 2. A diagram of the charge exchange gas cell/accelerating unit...
Figure 4. 30 keV (V í µí°» − ) incident H − beam (1.5 mA) with 6 sccm...
Figure 5. 20 keV, 3.5 mA H − beam incident on the gas cell showing...
Creating negative ion beams from neutral gases using a negative hydrogen ion source
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  • May 2024
A typical method to produce negative ion beams uses alkali vapour as a medium for a double charge exchange to convert incident positive (1+) beams to negative (1-) beams. Alkali vapours pose a problem in ion production as they are flammable, explosive and cause vacuum surface contamination. Thus, it is advantageous to use non-metallic vapours for c...
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Context 1
... our case, the incident negative ion beam is H − (Y) and the target neutral vapour is He or H 2 (X). Figure 1 displays this charge exchange process (H − + X → H + X − ) throughout the beamline of the apparatus used for this experiment with example beam energies for the H − and X − beams. The test setup is described in more detail in section 2. ...
Context 2
... collected beam current is read using a digital picoammeter (Keithley 6485) with a resolution of 0.1 nA. A top-view of the full beamline for the experimental setup and ion species path is displayed in figure 1. ...