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beam current
A nanosecond electron accelerator with an output energy as great as 600 keV, a beam current of 16 kA, and an accelerating voltage half-height duration of ~180 ns is described.
      
The source provides an electron-beam current of up to 0.1 A and an energy of up to 20 keV.
      
The measured beam current density is ~5-50 A/cm2, and the resolution is ~0.1 cm.
      
A collector assembly for measuring a subnanosecond-duration electron beam current
      
Si3N4 SOI Structures Produced by Nitrogen Ion Implantation at High Energies and Beam Current Densities
      
Under optimal imaging conditions, the ion-beam current on a target is found to depend only on the properties of the ion source and to be the same as those of macroscopic FIB systems regardless of their operating voltage.
      
It is also shown that the characteristic time of dust particle charging is shorter than 1 μs for a beam current density of 90 μA/cm2, while the neutralization of the charge takes milliseconds.
      
Local action of an electron beam with a high electron energy (25 keV) and a beam current above 10 mA caused deformation of the whole dust structure and shifted it in the horizontal direction so that it was carried away from the RF discharge zone.
      
The optimal generator open-circuit voltage was found for which the electron-beam current amplitude produced in a gas diode was maximal behind a foil.
      
Advantages of the proposed method are a low scatter of the initial ion energy (below 10-1 eV) and a high emittance in the region of the virtual source (~10-6 cm rad at a beam current on the level of microamperes).
      
Calculations showed that the maximum temperature to which a microvolume of silicon dioxide is overheated can be as high as 1200°C for an electron beam current of 100 nA.
      
It is shown that, as the beam current and the electrode voltage increase, the maximum electrostatic field in the lens tends to a certain limiting value because of the increase in the spatial potential near the lens axis.
      
It is shown that, in strong electric fields that can be generated in the coherent interaction, the beam current is very sensitive to the phase of the microwave field.
      
The possibility is demonstrated of increasing the generation frequency without changing the beam current.
      
In simulations, the beam current density was varied from 1 to 106 μA/cm2.
      
It is shown that, in a He plasma, dust grains of radius 5 μm and larger perturb the electron temperature only slightly, although the reduced electric field near the grain reaches 8 Td, the beam current density being 106 μA/cm2.
      
As the beam current grows, the ponderomotive force plays an increasingly important role and radically changes the mechanism by which the beam-plasma instability saturates.
      
It is shown that, for actual electron beam current densities, a significant energy deposition in a non-self-sustained discharge in the mixtures under study can be achieved due to the high rate of electron detachment from negative ions.
      
At low pressures, when the space charge is undercompensated, the field within the beam is determined by the dynamic processes related to oscillations of the beam current.
      
It is shown that the critical beam current decreases with external magnetic field and that there is an optimum magnetic induction at which the critical current for the onset of an oscillating virtual cathode in the beam is minimum.
      
 

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