Development of Secondary Electron Emission Measurement System for Wide Energy Range with Aging

2015 ◽  
Vol 135 (7) ◽  
pp. 433-434
Author(s):  
Hiromu Nagato ◽  
Kazuaki Shibuya ◽  
Hiroaki Miyake ◽  
Yasuhiro Tanaka ◽  
Masamichi Ohira ◽  
...  
Keyword(s):  
Energy Range ◽  
Measurement System ◽  
Electron Emission ◽  
Secondary Electron ◽  
Secondary Electron Emission ◽  
Wide Energy Range ◽  
Emission Measurement ◽  
Wide Energy

Application of WFS for Simultaneous Work Function and Secondary Electron Emission Measurement on Ba Covered Tungsten

2005 ◽  
Vol 473-474 ◽  
pp. 293-296
Author(s):  
György Vida ◽  
Ildikó Beck ◽  
V. Katalin Josepovits ◽  
Miklós Győr
Keyword(s):  
Work Function ◽  
Electron Emission ◽  
Secondary Electron ◽  
Secondary Electron Emission ◽  
Secondary Emission ◽  
Operating Conditions ◽  
Emission Measurement ◽  
Pressure Discharge ◽  
Emission Yield ◽  
Burning Voltage

In the present paper the secondary emission and work function of W covered with different thickness Ba layers are compared. The secondary emission and work function were measured by Work Function Spectroscopy (WFS). It is clearly pointed out that the thin Ba coating causes the the enhancement of electron induced secondary electron emission. In high pressure discharge lamps high secondary emission and high thermionic current are required for reliable operating conditions, i.e., for reaching the nominal burning voltage and current etc. The results prove that the Ba spreading on the W surface from an alkali earth tungstate material is advantageous for lowering the work function and, simultaneously, for increasing the secondary emission yield.

scholarly journals Secondary Electron Emission of Pt: Experimental Study and Comparison With Models in the Multipactor Energy Range

2016 ◽  
Vol 63 (8) ◽  
pp. 3270-3277 ◽  
Author(s):  
Enrique Bronchalo ◽  
Angela Coves ◽  
Rafael Mata ◽  
Benito Gimeno ◽  
Isabel Montero ◽  
...  
Keyword(s):  
Experimental Study ◽  
Energy Range ◽  
Electron Emission ◽  
Secondary Electron ◽  
Secondary Electron Emission

MAXIMUM SECONDARY ELECTRON YIELD AND PARAMETERS OF SECONDARY ELECTRON YIELD OF METALS

2016 ◽  
Vol 23 (05) ◽  
pp. 1650039 ◽  
Author(s):  
AI-GEN XIE ◽  
HAN-SUP UHM ◽  
YUN-YUN CHEN ◽  
EUN-HA CHOI
Keyword(s):  
Energy Range ◽  
Electron Emission ◽  
Energy Band ◽  
Secondary Electron ◽  
Secondary Electron Emission ◽  
Average Energy ◽  
Surface Barrier ◽  
Secondary Electrons ◽  
Secondary Electron Yield ◽  
Electron Yield

On the basis of the free-electron model, the energy range of internal secondary electrons, the energy band of a metal, the formula for inelastic mean escape depth, the processes and characteristics of secondary electron emission, the probability of internal secondary electrons reaching surface and passing over the surface barrier into vacuum B as a function of original work function [Formula: see text] and the distance from Fermi energy to the bottom of the conduction band [Formula: see text] was deduced. According to the characteristics of creation of an excited electron, the definition of average energy required to produce an internal secondary electron [Formula: see text], the energy range of excited electrons and internal secondary electrons and the energy band of a metal, the formula for expressing [Formula: see text] using the number of valence electron of the atom V, [Formula: see text] and atomic number Z was obtained. Based on the processes and characteristics of secondary electron emission, several relationships among the parameters of the secondary electron emission and the deduced formulae for B and [Formula: see text], the formula for expressing maximum secondary electron yield of metals [Formula: see text] using Z, V, back-scattering coefficient r, incident energy of primary electron at which secondary electron yield reaches [Formula: see text], [Formula: see text] and [Formula: see text] was deduced and demonstrated to be true. According to the deduced formula for [Formula: see text] and the relationships among [Formula: see text] and several parameters of secondary electron emitter, it can be concluded that high [Formula: see text] values are linked to high V, Z and [Formula: see text] values, and vice versa. Based on the processes and characteristics of secondary electron emission and the deduced formulae for the B, [Formula: see text] and [Formula: see text], the influences of surface properties on [Formula: see text] were discussed.

scholarly journals Secondary electron emission measurement from Cr and Cu bombarded by an Ne10+ beam at 6 MeV/n

2020 ◽  
Vol 2020 (3) ◽  
Author(s):  
A Higashi ◽  
Y Hashimoto ◽  
D Ohsawa ◽  
T Shirai ◽  
K Noda
Keyword(s):  
Fermi Level ◽  
Electron Emission ◽  
Secondary Electron ◽  
Small Difference ◽  
Secondary Electron Emission ◽  
Stopping Power ◽  
Emission Measurement ◽  
Electron Density Of States ◽  
Emission Yield ◽  
Conduction Electron Density

Abstract Backward secondary-electron-emission yield ($\delta$) from plates of 0.1 mm-thick Cu and 1 mm Cr and Al have been measured by irradiation of a fully stripped Ne$^{10+}$ beam at 6 MeV/$n$ stopped within each plate. A difference between $\delta$s from Cr and Cu larger than the ambiguity of this measurement ($\pm$3%) has been observed, with the discrepancy of the predicted small difference by kinetic emission based on stopping power and work function of each metal. The measured $\delta$ from Cr is larger than that from Cu, and also than previous measurements of other transition metals of the 3$d$ series, not only for the process of potential emission but also for kinetic. The conduction-electron density of states around the Fermi level calculated for the metals shows that the number of electrons just below the Fermi level and excited over it to an empty level by many kinds of reaction with the beam irradiation has to be considered. The number involved in this emission from Cr thus seems to be much larger than from Cu, which explains the relation of magnitudes for $\delta$. The measured $\delta$ from Al is larger than previous results, but is still consistent due to the existence of Al$_2$O$_3$ on the Al.

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