Class PlasmaPhysics

java.lang.Object

org.episteme.natural.physics.classical.matter.plasma.PlasmaPhysics

public class PlasmaPhysics
extends Object

Plasma physics calculations.

Since:

1.0

Author:

Silvere Martin-Michiellot, Gemini AI (Google DeepMind)

Field Summary

Fields

Modifier and Type	Field	Description
static final Real	E	Elementary charge (C)
static final Real	EPSILON_0	Vacuum permittivity (F/m)
static final Real	K_B	Boltzmann constant (J/K)
static final Real	M_E	Electron mass (kg)
static final Real	M_P	Proton mass (kg)

Constructor Summary

Constructors

Constructor	Description
PlasmaPhysics()

Method Summary

Modifier and Type	Method	Description
static Real	alfvenVelocity(Real magneticField, Real massDensity)	Alfvén velocity. v_A = B / √(μ₀ ρ)
static Real	beta(Real density, Real temperature, Real magneticField)	Beta: ratio of plasma pressure to magnetic pressure.
static Real	collisionFrequency(Real density, Real temperature, Real coulombLog)	Collision frequency (electron-ion).
static Real	coulombLogarithm(Real density, Real temperature)	Coulomb logarithm (approximate). ln(Λ) ≈ln(12π n λ_D³)
static Real	debyeLength(Real temperature, Real density)	Debye length: characteristic screening distance.
static Real	electronCyclotronFrequency(Real magneticField)	Electron cyclotron frequency (gyrofrequency).
static Real	ionCyclotronFrequency(Real magneticField, Real ionMass, int chargeNumber)	Ion cyclotron frequency.
static Real	larmorRadius(Real velocity, Real magneticField, Real mass)	Larmor radius (gyroradius). r_L = m v_perp / (eB)
static Real	plasmaFrequency(Real density)	Plasma frequency: natural oscillation frequency.
static Real	plasmaFrequencyHz(Real density)	Plasma frequency in Hz.
static Real	plasmaParameter(Real density, Real debyeLength)	Plasma parameter: number of particles in Debye sphere.
static Real	soundSpeed(Real temperature, Real ionMass, Real gamma)	Sound speed in plasma. c_s = √(γ k_B T / m_i)
static Real	spitzerResistivity(Real temperature, Real coulombLog, int Z)	Spitzer resistivity.
static Real	thermalVelocity(Real temperature, Real mass)	Thermal velocity. v_th = √(k_B T / m)

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

EPSILON_0

public static final Real EPSILON_0

Vacuum permittivity (F/m)

E

public static final Real E

Elementary charge (C)

M_E

public static final Real M_E

Electron mass (kg)

M_P

public static final Real M_P

Proton mass (kg)

K_B

public static final Real K_B

Boltzmann constant (J/K)

Constructor Details

PlasmaPhysics

public PlasmaPhysics()

Method Details

debyeLength

public static Real debyeLength(Real temperature,
 Real density)

Debye length: characteristic screening distance. λ_D = √(ε₀ k_B T / n e²)

plasmaFrequency

public static Real plasmaFrequency(Real density)

Plasma frequency: natural oscillation frequency. ω_p = √(n e² / ε₀ m_e)

plasmaFrequencyHz

public static Real plasmaFrequencyHz(Real density)

Plasma frequency in Hz.

electronCyclotronFrequency

public static Real electronCyclotronFrequency(Real magneticField)

Electron cyclotron frequency (gyrofrequency). ω_ce = eB / m_e

ionCyclotronFrequency

public static Real ionCyclotronFrequency(Real magneticField,
 Real ionMass,
 int chargeNumber)

Ion cyclotron frequency. ω_ci = ZeB / m_i

larmorRadius

public static Real larmorRadius(Real velocity,
 Real magneticField,
 Real mass)

Larmor radius (gyroradius). r_L = m v_perp / (eB)

thermalVelocity

public static Real thermalVelocity(Real temperature,
 Real mass)

Thermal velocity. v_th = √(k_B T / m)

plasmaParameter

public static Real plasmaParameter(Real density,
 Real debyeLength)

Plasma parameter: number of particles in Debye sphere. Λ = n λ_D³

coulombLogarithm

public static Real coulombLogarithm(Real density,
 Real temperature)

Coulomb logarithm (approximate). ln(Λ) ≈ln(12π n λ_D³)

alfvenVelocity

public static Real alfvenVelocity(Real magneticField,
 Real massDensity)

Alfvén velocity. v_A = B / √(μ₀ ρ)

soundSpeed

public static Real soundSpeed(Real temperature,
 Real ionMass,
 Real gamma)

Sound speed in plasma. c_s = √(γ k_B T / m_i)

beta

public static Real beta(Real density,
 Real temperature,
 Real magneticField)

Beta: ratio of plasma pressure to magnetic pressure. β = nkT / (B²/2μ₀)

spitzerResistivity

public static Real spitzerResistivity(Real temperature,
 Real coulombLog,
 int Z)

Spitzer resistivity.

collisionFrequency

public static Real collisionFrequency(Real density,
 Real temperature,
 Real coulombLog)

Collision frequency (electron-ion).