scholarly journals Glow‐discharge‐created electron beams: Cathode materials, electron gun designs, and technological applications

1984 ◽  
Vol 56 (3) ◽  
pp. 790-797 ◽  
Author(s):  
J. J. Rocca ◽  
J. D. Meyer ◽  
M. R. Farrell ◽  
G. J. Collins
Keyword(s):  
Glow Discharge ◽  
Cathode Materials ◽  
Electron Beams ◽  
Electron Gun

Energy Distribution in Electron Beams

1972 ◽  
Vol 30 ◽  
pp. 568-569
Author(s):  
Tamotsu Ohno
Keyword(s):  
Electron Beam ◽  
Energy Distribution ◽  
Cross Section ◽  
Integral Curve ◽  
Electron Beams ◽  
Electron Gun ◽  
Angular Divergence ◽  
Apparent Increase ◽  
Integral Width ◽  
The Cross

The energy distribution in an electron; beam from an electron gun provided with a biased Wehnelt cylinder was measured by a retarding potential analyser. All the measurements were carried out with a beam of small angular divergence (<3xl0-4 rad) to eliminate the apparent increase of energy width as pointed out by Ichinokawa.The cross section of the beam from a gun with a tungsten hairpin cathode varies as shown in Fig.1a with the bias voltage Vg. The central part of the beam was analysed. An example of the integral curve as well as the energy spectrum is shown in Fig.2. The integral width of the spectrum ΔEi varies with Vg as shown in Fig.1b The width ΔEi is smaller than the Maxwellian width near the cut-off. As |Vg| is decreased, ΔEi increases beyond the Maxwellian width, reaches a maximum and then decreases. Note that the cross section of the beam enlarges with decreasing |Vg|.

scholarly journals Electron yield of glow discharge cathode materials under helium ion bombardment

1988 ◽  
Vol 53 (5) ◽  
pp. 358-360 ◽  
Author(s):  
B. Szapiro ◽  
J. J. Rocca ◽  
T. Prabhuram
Keyword(s):  
Glow Discharge ◽  
Cathode Materials ◽  
Ion Bombardment ◽  
Electron Yield ◽  
Helium Ion

Measurement of Energy Parameters for Electron Gun Heater Currents and Output Dose Rate for Electron Beams from a Prototype Linac

2016 ◽  
Vol 27 (1) ◽  
pp. 25 ◽  
Author(s):  
Heuijin Lim ◽  
Manwoo Lee ◽  
Me Young Kim ◽  
Jungyu Yi ◽  
Mujin Lee ◽  
...  
Keyword(s):  
Dose Rate ◽  
Electron Beams ◽  
Electron Gun ◽  
Energy Parameters

Run-aways im Neutralgas

1961 ◽  
Vol 16 (3) ◽  
pp. 246-252 ◽  
Author(s):  
G. Ecker ◽  
K. G. Müller
Keyword(s):  
Relaxation Time ◽  
Boltzmann Equation ◽  
Glow Discharge ◽  
Initial Velocity ◽  
Average Velocity ◽  
Electron Beams ◽  
Critical Value ◽  
Inelastic Collisions ◽  
Stopping Power ◽  
Scattering Parameters

The motion of electrons as determined by the field acceleration and the elastic and inelastic collisions with the gas atoms is calculated from the BOLTZMANN equation. We derive the average velocity and the scattering ellipsoid as a function of time. For particles starting from rest there exists always a critical electric field Ec depending on pressure and temperature. Below this critical value electrons approach the stationary drift process. Above the critical value the electrons do not reach a stationary state, they “run away”. For a finite initial velocity ν0 and a field below the critical value Ec the particles are either accelerated to drift, or decelerated to drift, or “run away”, depending on the value ν0. From a calculation of the scattering parameters we find for E > Ec a focussing effect in the velocity space which increases with field strength. Also the relaxation time for the drift process and the stopping power for electron beams can be calculated. Applications to the glow discharge are discussed.

Spin Polarized Low Energy Electron Microscopy of Surface Magnetic Structure

1991 ◽  
Vol 232 ◽  
Author(s):  
M. S. Altman ◽  
H. Pinkvos ◽  
J. Hurst ◽  
H. Poppa ◽  
G. Marx ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Magnetic Structure ◽  
Electron Beams ◽  
Low Energy ◽  
Energy Electron ◽  
Electron Gun ◽  
Image Subtraction ◽  
Topological Features ◽  
Spin Polarized ◽  
Low Energy Electron

ABSTRACTSpin polarized low energy electron microscopy (SPLEEM) has been developed for the high resolution imaging of surface magnetic structure. The existing LEEM ha.s been modified by the incorporation of a. GaAs-type spin polarized electron gun. Large image contrast arises due to the spin-dependent exchange scattering, whifle the st.in-orbit contribution vanishes uniquely for the normal incidence/exit geometry used here. Pixel by pixel image subtraction for incident electron beams of opposite polarization yields precisely the spatially resolved Bragg reflection asymmetry observed in spin polarized low energy electron diffraction. The shallow electron penetration depth arising from the strong coulombic interaction is advantageous for separating surface behavior from the normally overwhelning bulk. Therefore, the use of transversally polarizedI electron beams allows the determination of in-plane surface magnetization directions. Fnrthermore, the parallel illumination and detection of SPLEEM makes it possible to image quickly with a. resolution better than 500 Å in the present configuration. A useful and direct. comparison between surface magnetic, structural, and topological features is made possible by the augmentation of the unique imaging capabilities of conventional LEEM with the magnetic sensitivity of SPLEEM. In this manner, the magnetic domain structure of a Co (0001) surface and in-situ grown Co filmns on Mo(110) have been determined.

Application of glow discharge electron gun to surface modification

Vacuum ◽  
1990 ◽  
Vol 41 (7-9) ◽  
pp. 2177-2180 ◽  
Author(s):  
J. Felba ◽  
K. Friedel ◽  
K. Przybecki
Keyword(s):  
Surface Modification ◽  
Glow Discharge ◽  
Electron Gun
Sign in / Sign up

Export Citation Format

Share Document