Discharge-Chamber Sputtering in Mercury Ion Thrusters

Williamson, W. S.; Hyman, J.

doi:10.2514/3.57330

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…7 This technique uses alternating layers of metals with contrasting colors, such as copper and tantalum or copper and molybdenum. 7 This technique uses alternating layers of metals with contrasting colors, such as copper and tantalum or copper and molybdenum.…”

Section: A Generalmentioning

confidence: 99%

Probe for measuring ion beam angular distribution

Kahn

Kaufman

Phillips

et al. 1996

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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Low energy ion beam mixing as a tool for multilayer xray mirror fabricationA new type of ion beam probe is described that measures the angular distribution of energetic ions and, through their sputtering effects, energetic neutrals as well. This probe does not require either complicated motion actuators or very sensitive electrical measurements in the adverse environment of an ion beam, but instead performs the measurement through the sputter etching of a multilayer sample with contrasting metal colors. This probe was tested and found to provide a half-width at half-maximum reproducibility of about Ϯ0.3 deg. After use, the probe sample provides a permanent record of the angular distribution of the ion beam at the target location tested. Because no electrical contacts are required, the probe can even be attached to a moving stage to measure the effective angular distribution of an ion beam while being carried through a complicated planetary pattern. Using this probe, the low divergence and paraxial beam from an ion source with 30 cm flat graphite grids were documented. This probe, in conjunction with profiles obtained with a Faraday probe, allows full global and internal ion beam characterization. It is significant that the minimum divergences obtained in this investigation were 40-60 percent lower than the minimum divergences obtained from earlier tests with small arrays of apertures.

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Section: A Generalmentioning

confidence: 99%