The drift velocity is the average velocity that a particle, such as an electron, attains due to an electric field. Since particles can accelerate arbitrarily close to the speed of light in the absence of other forces, the term "drift velocity" can only really apply to carriers in materials, and not to particles in a vacuum. Particles in solids, for example, actually collide or scatter with the crystal lattice (or phonons), which slows them down. The velocity of an object is simply its speed in a particular direction. ... Properties The electron is a lightweight fundamental subatomic particle that carries a negative electric charge. ... In physics, an electric field or E-field is an effect produced by an electric charge (or a time-varying magnetic field) that exerts a force on charged objects in the field. ... Acceleration is the time rate of change of velocity, and at any point on a v-t graph, it is given by the slope of the tangent to that point In physics, acceleration (symbol: a) is defined as the rate of change (or time derivative) of velocity. ... Cherenkov effect in a swimming pool nuclear reactor. ... In particle physics, scattering is a class of phenomena by which particles are deflected by collisions with other particles. ... In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. ... In physics, a phonon is a quantized mode of vibration occurring in a rigid crystal lattice, such as the atomic lattice of a solid. ...
In a semiconductor, the two main carrier scattering mechanisms are ionized impurity scattering and lattice scattering. A semiconductor is a material with an electrical conductivity that is intermediate between that of an insulator and a conductor. ...
Jdrift = ρ * ʋavg where ρ is charge density in units C/cm^3, and ʋavg is the average velocity of the carriers
ʋavg = μ * E where μ is the mobility of the carriers (cm^2 / V-s) and E is the electric field (V/cm)
The driftvelocity is the average velocity that a particle, such as an electron, attains due to an electric field.
Since particles can accelerate arbitrarily close to the speed of light in the absence of other forces, the term "driftvelocity" can only really apply to carriers in materials, and not to particles in a vacuum.
The drift distance is calculated using a driftvelocity parametrized by bench measurements.
For a constant driftvelocity, t0 seems to be positive, while for the parametrized one, it seems to be negative.
Since the parametrized driftvelocity should reproduce the detetor's behavior more closely than a simple constant velocity, one is driven to conclude that t0 must be negative and its value should be between -3 and -4.
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