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Plasma Physics

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Plasma Physics

Bohm Sheath Criterion

A fundamental boundary condition stating that positive ions entering a non-neutral plasma sheath must enter with a velocity at or exceeding…

v_ion ≥ c_s = √(k_B T_e / m_i) (at Sheath Entrance) m/s (Ion Acoustic Sound Speed c_s)
Plasma Physics

Bootstrap Current

A self-generated toroidal electric current in a tokamak plasma driven by trapped particle banana orbits in steep pressure gradients.

I_bootstrap ∝ √ε (k_B / B_poloidal) (dn / dr) MA (Plasma Current Fraction)
Plasma Physics

Bremsstrahlung Radiation in Plasma

Continuous electromagnetic radiation emitted when free plasma electrons undergo deceleration scattering off positive ions.

P_brems ∝ Z_eff n_e² √T_e W/m³ (Radiated Power Density)
Plasma Physics

Burning Plasma & Alpha Heating

The state of a fusion plasma where thermal heating from 3.5 MeV alpha particles produced in Deuterium-Tritium fusion reactions becomes the…

P_alpha / P_heating ≥ 50% (Burning Plasma Condition Q ≥ 10) MW (Alpha Particle Heating Power)