نتایج جستجو برای: plasma density
تعداد نتایج: 740512 فیلتر نتایج به سال:
When a short electron beam propagates in an underdense plasma (plasma density 0 n < beam density b n ) with a downward density transition, it is known that some background plasma electrons are trapped and accelerated by the plasma wakefield [1]. Beam quality of the trapped plasma electrons is severely affected by the wakefield that is generated by the driving electron beam, so dynamics and inst...
Plasma density transition trapping is a recently proposed self-injection scheme for plasma wake-field accelerators. This technique uses a sharp downward plasma density transition to trap and accelerate background plasma electrons in a plasma wake-field. This paper recounts the first attempt to demonstrate density transition trapping experimentally. The goal of the experiment is to capture a ∼ 1...
Abstract As a plasma-based method, diaphragm discharge plasma, an underwater discharge, exhibits relatively high production rate and efficiency of hydrogen peroxide (H 2 O ). This study aimed to characterize the energetic state plasma H mechanism by optical emission spectroscopy, evaluating excitation temperature, gas electron density, their temporal variations. The temperature was approximatel...
An on-axis plasma density depression channel was observed during and after the passage of a relativistically and ponderomotively self-guided laser pulse through a plasma. Optical interferometry was used to produce time-resolved plasma density distributions, revealing the formation of a plasma waveguide. These results were complemented by the guiding of a collinear trailing pulse. [S0031-9007(98...
this study was conducted to determine the effects of adding ethanol extract of propolis (eep) and cumin essential oil (ceo) to diets of broiler chicks on the performance, blood parameters, immune response and carcass traits. a total of 240 day-old ross-308 broiler chicks were randomly allocated to four treatments with six replicates and 10 birds in each replicate in a completely randomized desi...
In the E-157 experiment now being conducted at the Stanford Linear Accelerator Center, a 30 GeV electron beam of 2310 electrons in a 0.65-mm-long bunch is propagated through a 1.4-m-long lithium plasma of density up to 2310 e/cm. The initial beam density is greater than the plasma density, and the head of the bunch expels the plasma electrons leaving behind a uniform ion channel with transverse...
The aim of this study was investigating some blood parameters of blue-neck male ostriches (Struthio camelus) with 4 months old after feeding a diet containing 3% sunflower oil for two months. In the morning, after about 12 h of fasting, some blood samples were collected from the wing vein of ostriches at the beginning and 60 days of study in department of animal sceince Arak university . The pl...
Reversed Field Pinches (RFPs) share with Tokamaks and Stellarators the experimental evidence of an upper limit for the maximum value of the electron density at which they can operate. Above a certain density level, well described by the Greenwald law for Tokamaks and RFPs, a radiative collapse with strong plasma cooling is observed, predominantly due to processes occurring at the plasma boundar...
axial distributions of plasma and floating potentials, electron number density and the electron energy distribution function (eedf) have been measured in the double layer (dl) region of an he discharge constriction. excitation processes in the constriction region are studied. using a linearization method for the nonstationary balance equations and choosing appropriate discharge conditions, the ...
Probe theories are only applicable in the regime where the probe’s perturbation of the plasma can be neglected. However, it is not always possible to know, a priori, that a particular probe theory can be successfully applied, especially in low density plasmas. is is especially difficult in the case of transient, low density plasmas. Here, we applied probe diagnostics in combination with a 2D p...
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