Characterization of self-generated intense electron beams in a plasma focus

The parameters of self-generated electron beams have been measured and correlated to the dynamics of a 60 kV, 28 kJ plasma focus. The electron beam emission occurs in two periods: the first corresponds to the initial formation and disruption of the pinched plasma and terminates with the disruption of the plasma column, and the second period occurs after the breaking up of the focus plasma. The first period is characterized by high-energy electron beams, whereas in the second period the electron beams have lower average energies but higher currents. A relativistic electron beam is found to occur around the time of first compression, when the plasma is observed to be macroscopically stable, in contrast to measurements obtained from machines with similar energies but operating at lower voltages. The plasma X-ray emission is observed to be closely related to the electron beam characteristics. Possible mechanisms for the formation of the electron beams observed are discussed.

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Study thermodynamic assessment of the B-C and B-Si binary systems with swift heavy ions and high intense electron beam irradiation at the low temperature

Modern Physics Letters B ◽

10.1142/s0217984920503959 ◽

2020 ◽

Vol 34 (34) ◽

pp. 2050395

Author(s):

Matlab N. Mirzayev

Keyword(s):

Electron Beam ◽

Low Temperature ◽

Heavy Ions ◽

Electron Beam Irradiation ◽

Electron Beams ◽

High Energy ◽

Beam Irradiation ◽

Swift Heavy Ions ◽

Intense Electron Beam ◽

Intense Electron

B4C and B6Si samples have been irradiated by using swift heavy ions and high intense electron beam. Ion irradiation of the samples was carried at the different electron fluences [Formula: see text], [Formula: see text] and [Formula: see text] cm[Formula: see text] ion/cm2, and energy of ions flux 167 MeV. Also, the samples were irradiated with high energy electron beams at the linear electronic accelerator at different electron fluencies up to [Formula: see text] cm[Formula: see text] and energy of electron beams 2.5 MeV and current density of electron beams [Formula: see text]s. The unirradiation and irradiation of the thermodynamic kinetics of samples at low-temperature change with a differential mechanism. In the DSC curves, at the low temperature for unirradiation and irradiation, boron carbide and boron silicide samples do not undergo phase transition. But at the [Formula: see text] K temperature range, the thermodynamic mechanism of ions and electron beam irradiation are very difficult and measuring the temperature of conductivity, thermal conductivity, calibration factor, specific heat capacity becomes more complicated.

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The interaction of electron beams with solids - Some new effects

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100177076 ◽

1990 ◽

Vol 48 (4) ◽

pp. 788-789

Author(s):

C J Humphreys ◽

T J Bullough ◽

R W Devenish ◽

D M Maher ◽

P S Turner

Keyword(s):

Electron Beam ◽

Field Emission ◽

Electron Irradiation ◽

Electron Beams ◽

Incident Electron Beam ◽

Surface Steps ◽

Wide Range ◽

Intense Electron Beams ◽

Intense Electron ◽

Scale Surface

It has recently been found that electron beams, of energy typically 100 keV, can damage a very wide range of solids, many of which are normally thought to be stable to electron irradiation. For example, metals, semiconductors and ceramics can all be damaged by electrons having energy less than that required for direct displacement damage. Radiation damage effects are particularly apparent when using intense electron beams from field emission guns in STEM's, TEM's and SEM's, but damage also occurs in materials thought to be stable when using electrons from LaB6, or heated W filaments. Considerable care must therefore be taken in microanalysis, etc, particularly when using field emission guns.If the incident electron beam is focussed to nanometre-scale diameter, then nanometre-scale surface and volume structures (e.g. indentations, holes and lines) can be produced in a variety of specimens. It is also possible to cut a specimen to a desired shape with nanometre precision and to remove surface steps from surfaces, leaving them atomically smooth.

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