The rollover of electron density, a common indicator for the onset volumetric recombination, was observed in hydrogen plasma, first time DT-ALPHA. Electron density and temperature were measured near plasma production region secondary gas feeding position with various conditions regarding amount gas. A at position, whereas remained nearly constant. This behavior indicates an enhancement molecula...

Rat livers were perfused for 6 h without added plasma proteins using washed erythrocytes and buffer in a recirculating system. An inhibitor to the enzyme lecithin-cholesterol acyltransferase (5,5'-dithionitrobenzoic acid) was added in some experiments to prevent modification of substrate-lipids contained in secreted lipoproteins. The inhibitor did not detectably alter hepatic ultrastructure or ...

A general formulation for the measurement of plasma density and effective collision frequency for lowly as well as highly, collisional plasmas using millimeter wave interferometry is presented. In the presence of high density and collisionality at high gas pressures where the collision frequency ~n! is of the order of both the plasma (vp) and the wave frequency of the millimeter wave ~v! (n ;v ...

We model the trapping of plasma e− within the density structures excited by a propagating energy source (βS ' 1) in a rising plasma density gradient. Rising density gradient leads to spatially contiguous coupled up-chirped plasmons (dωpe (x)/dx > 0). Therefore phase mixing between plasmons can lead to trapping until the plasmon field is high enough such that e− trajectories returning towards a ...

A dense plasma structure was observed to form near the extraction aperture of a helium RF plasma cathode. Laser collision-induced fluorescence was used to generate two-dimensional spatial maps of the electron density and the effective electron temperature within the structure over a range of operating conditions. The aperture plasma reached densities nearly an order of magnitude higher than the...

In experimental studies of laser-plasma interactions, the laser radiation can exist inside plasma regions where electron density is below critical (“underdense” plasma), as well at surface density. The could exhibit a rich physics. Namely, incident get converted in transverse electromagnetic waves significantly higher amplitudes than radiation, due to various nonlinear processes. We proposed di...

Observations from the WHISPER (Waves of High frequency and Sounder for Probing of Electron density by Relaxation) instrument on board Cluster, for the interval spanning 2001–2012, are utilized to determine an empirical model describing the total electron density along closed geomagnetic field lines. The model, representing field lines in the region of 4.5≤ L<9.5, includes dependences on L and m...

The investigation of phenomena concerning the interaction of heavy ions with plasmas is a key research activity of the plasma physics group at the Gesellschaft für Schwerionenforschung (GSI). The laboratory at GSI offers the unique opportunity to measure the charge state distribution and the energy loss of swift heavy ions after they have penetrated a hot and dense plasma [1]. The laser induced...