Astra!ny-start

1 files changed, 0 insertions, 112 deletions

diff --git a/src/physics/models.ts b/src/physics/models.ts
deleted file mode 100644
index 8fb121f..0000000
--- a/src/physics/models.ts
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@@ -1,112 +0,0 @@
-import { COULOMB_CONSTANT, electricField, type Charge, type Point } from './electricField';
-
-export const VACUUM_PERMITTIVITY = 8.8541878128e-12;
-export const ELEMENTARY_CHARGE = 1.602176634e-19;
-const THERMAL_ENERGY_EV = 8.617333262e-5 * 300;
-
-function positive(...values: number[]) {
-  if (values.some(value => !Number.isFinite(value) || value <= 0)) {
-    throw new RangeError('Physical dimensions and material constants must be finite and positive.');
-  }
-}
-
-/** Vacuum potential in volts, referenced to infinity. Undefined inside the
- * same 0.18 m visualization exclusion used by electricField. */
-export function potential(point: Point, charges: readonly Charge[]): number {
-  let volts = 0;
-  for (const charge of charges) {
-    if (charge.coulombs === 0) continue;
-    const r = Math.hypot(point.x - charge.x, point.y - charge.y, point.z - charge.z);
-    if (r < 0.18) return NaN;
-    volts += COULOMB_CONSTANT * charge.coulombs / r;
-  }
-  return volts;
-}
-
-/** Force on a test charge, excluding that charge from the supplied sources. */
-export function forceOn(test: Charge, sources: readonly Charge[]): Point {
-  const field = electricField(test, sources);
-  return { x: field.x * test.coulombs, y: field.y * test.coulombs, z: field.z * test.coulombs };
-}
-
-export function pairEnergy(q1: number, q2: number, separation: number): number {
-  positive(separation);
-  return COULOMB_CONSTANT * q1 * q2 / separation;
-}
-
-/** Exact signed flux for an origin-centred spherical Gaussian surface.
- * A point charge exactly on the surface makes the integral undefined. */
-export function gaussianFlux(charges: readonly Charge[], radius: number): number {
-  positive(radius);
-  let enclosed = 0;
-  for (const charge of charges) {
-    if (charge.coulombs === 0) continue;
-    const r = Math.hypot(charge.x, charge.y, charge.z);
-    if (Math.abs(r - radius) < 1e-9) return NaN;
-    if (r < radius) enclosed += charge.coulombs;
-  }
-  return enclosed / VACUUM_PERMITTIVITY;
-}
-
-export interface CapacitorParameters {
-  area: number;
-  gap: number;
-  relativePermittivity: number;
-  voltage: number;
-  /** If isolated, voltage means the initial vacuum charging voltage. */
-  isolated?: boolean;
-}
-export function capacitor(p: CapacitorParameters) {
-  positive(p.area, p.gap, p.relativePermittivity);
-  const vacuumCapacitance = VACUUM_PERMITTIVITY * p.area / p.gap;
-  const capacitance = vacuumCapacitance * p.relativePermittivity;
-  const voltage = p.isolated ? p.voltage / p.relativePermittivity : p.voltage;
-  const charge = capacitance * voltage;
-  const field = voltage / p.gap;
-  return {
-    capacitance, voltage, charge, field,
-    energy: 0.5 * capacitance * voltage ** 2,
-    polarization: VACUUM_PERMITTIVITY * (p.relativePermittivity - 1) * field,
-  };
-}
-
-export interface ConductorParameters {
-  voltage: number;
-  resistivity: number;
-  length: number;
-  area: number;
-  carrierDensity: number;
-}
-export function conductor(p: ConductorParameters) {
-  positive(p.resistivity, p.length, p.area, p.carrierDensity);
-  const resistance = p.resistivity * p.length / p.area;
-  const current = p.voltage / resistance;
-  return {
-    resistance, current,
-    power: p.voltage * current,
-    density: current / p.area,
-    electronDrift: -current / (p.carrierDensity * ELEMENTARY_CHARGE * p.area),
-  };
-}
-
-export interface SemiconductorParameters {
-  intrinsicDensity: number;
-  /** Fully ionized donors minus acceptors, in m^-3. */
-  netDoping: number;
-  electronMobility: number;
-  holeMobility: number;
-}
-/** Non-degenerate thermal equilibrium at 300 K. Solving for the minority
- * through mass action avoids catastrophic subtraction at large doping. */
-export function semiconductor(p: SemiconductorParameters) {
-  positive(p.intrinsicDensity, p.electronMobility, p.holeMobility);
-  const majority = (Math.abs(p.netDoping) + Math.hypot(p.netDoping, 2 * p.intrinsicDensity)) / 2;
-  const minority = p.intrinsicDensity ** 2 / majority;
-  const electrons = p.netDoping >= 0 ? majority : minority;
-  const holes = p.netDoping >= 0 ? minority : majority;
-  return {
-    electrons, holes,
-    fermiShift: THERMAL_ENERGY_EV * Math.log(electrons / p.intrinsicDensity),
-    conductivity: ELEMENTARY_CHARGE * (electrons * p.electronMobility + holes * p.holeMobility),
-  };
-}