On the feasibility of electron cyclotron heating of overcritical plasma in a magnetic mirror trap

The feasibility of matching electromagnetic radiation in the electron cyclotron frequency range to a dense plasma in an open magnetic trap by producing an inverted (with a minimum on the axis) plasma density profile is discussed. The use of such a profile shows promise for the implementation of efficient cyclotron heating at plasma densities above the critical density, at which the Langmuir frequency is equal to the heating radiation frequency. Examples of the magnetic field and plasma density distributions in a mirror trap are presented for which analysis of the beam trajectories shows the feasibility of efficient electron cyclotron absorption of microwave beams in overcritical plasma.     

Numerical simulations of tangential microwave launching for EC heating in a tokamak

A scheme of tangential microwave launching is analyzed by using a weakly relativistic ray-tracing code. The scheme makes it possible to minimize the thickness of the heated magnetic-flux tube. Numerical simulations show that with tangential launching, the attainable localization of the power deposition region well satisfies the requirements for experiments on the stabilization of tearing modes in ITER-scale devices.     

Specificity and Selectivity of a Modified Radioligand Method for Estimating the Binding Activity of β1 Adrenergic Receptors in Human T Lymphocytes

Russian Journal of Bioorganic Chemistry - A radioligand-based method was proposed for quantifying the binding activity of β1-adrenergic receptors (ARs) on the surface of human T lymphocytes....     

Ray trajectories near the electron cyclotron resonance surface in an axisymmetric magnetic trap

Characteristic features of the propagation of electromagnetic electron cyclotron waves in the vicinity of the electron cyclotron resonance surface are investigated both analytically and numerically with allowance for variation in the magnetic field strength and a corresponding variation in the magnetic field direction. It is demonstrated that variation in the magnetic field direction can qualitatively change the wave propagation pattern and can markedly affect the efficiency of electron cyclotron resonance plasma heating in an axisymmetric magnetic trap.     

Ray trajectories and electron cyclotron absorption in an axisymmetric magnetic confinement system

The propagation and cyclotron absorption of electromagnetic waves lauched into an axisymmetric magnetic confinement system in a quasi-longitudinal direction is studied in the geometrical-optics approximation. Cyclotron absorption in a dense plasma is described by solving an approximate dispersion relation that is valid for small angles between the magnetic field B and the wave vector k. This approach makes it possible to avoid the difficulty associated with a transition from large propagation angles to the case of strictly longitudinal propagation. It is shown that electron cyclotron absorption can be efficient only when the plasma density is below the critical density. The numerical results obtained for the device for producing multicharged ions in experiments at the Institute of Applied Physics of the Russian Academy of Sciences agree qualitatively with the experimental data.     

Feasibility of using bernstein modes for current drive in toroidal devices

The feasibility of using Bernstein modes for producing electron cyclotron current drive in toroidal devices is examined. It is shown that the negative role of trapped particles may reduce upon increasing the longitudinal slowing-down factor of waves. Numerical geometrical-optics calculations of the propagation and absorption of waves were performed for the scheme in which radiation is launched from the low-field side as an ordinary wave, linearly converted into an extraordinary wave, and finally converted into Bernstein mode. An analysis is performed for medium-sized toroidal devices. Based on numerical simulation, the parameters determining the efficiency of current drive, namely, the characteristic values of the resonant energies and the longitudinal slowing-down factor of waves in the region where most of the microwave power dissipates, are found.