A simple example of a force drift is a plasma in a gravitational field, e.g. the ionosphere. The drift velocity is. Because of the
mass dependence
, the gravitational drift for the electrons can normally be ignored.
What is polarization drift?
This force gives rise to an
inertial drift and to a corresponding drift current
. An especially important case, in which acceleration results from a change in the rate of electrical drift, is caused by variations in the electric field. This particular case of inertial drift is therefore called the polarization drift.
What is E B drift?
This is called E-cross-B drift, sometimes written ExB drift from the mathematical notation. To understand why this is, consider just
the motion of the positive particle
. … Eventually, the curving of the path redirects the positive particle so it is moving in a direction opposite the electric field.
What is B in F qvB?
The magnetic field B is defined from the Lorentz Force Law, and specifically from the magnetic force on a moving charge: … The magnitude of the force is
F = qvB sinθ
where θ is the angle < 180 degrees between the velocity and the magnetic field.
What does a magnetic field do to a charged particle in a plasma?
In most plasmas of interest, a magnetic field exerts a force on a charged particle
only if the particle is moving, the force being at right angles to both the direction of the field and the direction of particle motion
. In a uniform magnetic field (B), a charged particle gyrates about a line of force.
What is reason for polarization drift?
Polarization drift
Because
of the mass dependence
, this effect is also called the inertia drift. Normally the polarization drift can be neglected for electrons because of their relatively small mass.
How much solid are in plasma?
Plasma is a state of matter that is often thought of as a subset of gases, but the two states behave very differently. Like gases, plasmas have no fixed shape or volume, and are less
dense than solids
or liquids.
How do you get R MV qB?
Solving for r above yields the gryoradius, or the radius of curvature of the path of a particle with charge q and mass m moving in a magnetic field of strength B. The gryoradius is then given by
r=mvqB r = mv qB
.
What is the name of motion of charged particles in any medium?
Electrical mobility
is the ability of charged particles (such as electrons or protons) to move through a medium in response to an electric field that is pulling them.
What is the gyro period of the electron?
Abstract: Gyro-period is
the time it takes the plasma particle (electron and ion) to complete one revolution
. This paper has explained how variation of magnetic field affects the gyro-period of plasma wave.
What does F BIL stand for?
F = BIL (f=
force
, b=magnetic field, i=current, l=length of conductor)
Is Tesla a SI unit?
The tesla (symbol T) is
the derived SI unit of magnetic flux density
, which represents the strength of a magnetic field. One tesla represents one weber per square meter.
What is L in F IlB sin theta?
experiences a force ( F) given by the equation
F = I l × B
or F = IlB sin θ, where l is the length of the wire, represented by a vector pointing in the direction of the current. The direction of the force may be found by a right‐hand rule similar to the one shown in Figure .
Can plasma be manipulated by magnetic field?
Because plasmas are so hot, the only way to control them is using
magnets
. … This means that moving charges, such as the electrons in a plasma, can behave as a magnet and be affected by a magnetic field. Scientists use strong magnets to confine plasmas that are millions of degrees!
Is the sun plasma?
The sun is made up of a blazing combination of gases. These gases are actually in the form of
plasma
. Plasma is a state of matter similar to gas, but with most of the particles ionized. … Instead, the sun is composed of layers made up almost entirely of hydrogen and helium.
Why can a magnetic field confine plasma?
By setting up magnetic field lines toroidally around the interior of the tokamak ,
the ions and electrons in the plasma
are forced to travel tightly around these field lines, preventing them from escaping the vessel. Extra fields help shape the plasma and hold it stable within the tokamak interior.
