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Low noise and stable emission from carbon nanotube electron sources
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View: Figures


Image of FIG. 1.
FIG. 1.

Emission measurements on electron source CNT 1 for and a vacuum of . (a) Field-emission pattern recorded with a microchannel plate and a phosphor screen. Inset: schematic drawing of a CNT on a support tip. (b) FN plot and a linear fit with a slope of (dashed). (c) Energy spectrum recorded at , , and a fit with the FN theory (dashed). (d) measured as function of time at and .

Image of FIG. 2.
FIG. 2.

Spectral analysis of the probe current of CNT 1. (a) as function of . The data presents the average of 10 measurements recorded in a period of . The noise of the measuring system (dotted) and a constant fitted to it (dashed) are also plotted. (b) The normalized spectral density of CNT 1 and a fit with the function (dashed).

Image of FIG. 3.
FIG. 3.

Noise percentages of seven CNTs measured in the frequency range with an integration time of . The probe current was typically , depending on the total current level and the distance from the CNT to the Faraday cup. The temperature was between 400 and . (a) Noise percentage as function of the total current for a vacuum level of . (b) Noise percentage as function of the vacuum level for total current levels of .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Low noise and stable emission from carbon nanotube electron sources