Autor: Knapek, J. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Cold field-emission cathode noise analysis
Autorzy:: Knápek, A.
Grmela, L.
Šikula, J.
Šik, O.
Powiązania:: https://bibliotekanauki.pl/articles/220678.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: cold field-emission cathode
noise diagnostics
epoxy coating
Opis:: Noise diagnostics has been performed on the cold field-emission cathode in high-vacuum. The tested cold fieldemission cathode, based on tungsten wire with ultra-sharp tip coated by epoxy was designed to meet the requirements of transmission electron microscopy, which uses a small and stable source of electrons. Current fluctuations are reduced by improving the structure and fabrication technology. Noise was measured both in time and frequency domains, which gives information about current fluctuations and also about charge transport. Mutual correlation between the noise spectral density, extractor voltage and beam brightness was analyzed.
Źródło:: Metrology and Measurement Systems; 2012, 19, 2; 417-422
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Preparation and noise analysis of polymer graphite cathode
Autorzy:: Knápek, A.
Horáček, M.
Chlumská, J.
Kuparowitz, T.
Sobola, D.
Šikula, J.
Powiązania:: https://bibliotekanauki.pl/articles/220760.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: field emission
polymer graphite
noise analysis
Opis:: The paper deals with the preparation and measurement of an experimental polymer graphite cathode that seems to be a promising and cheap source of electrons utilizing cold field-emission in high- and ultra-high vacuum. Polymer graphite seems to be a proper material as it contains a large amount of hybridized carbon with a low degree of surface oxidation and silicon monoxide (SiO). Within the frame of this work, a special experimental method of tip preparation has been designed and tuned. This method is based on ion milling inside a dual-beam electron microscope enabling to obtain ultra-sharp tips of a diameter smaller than 100 nm with a predefined opening angle. The charge transport within experimental samples is evaluated based on results provided by the noise spectroscopy of the total emission current in the time and frequency domains.
Źródło:: Metrology and Measurement Systems; 2018, 25, 3; 451-458
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

Artykuł

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