What Is the Bremsstrahlung Radiation Loss Calculator (Fusion Plasma)?
Bremsstrahlung is the continuous X-ray radiation emitted when electrons are accelerated or deflected by the electric field of atomic nuclei.
Because hot fusion plasmas are optically thin to X-rays, all Bremsstrahlung photons escape immediately to the vessel walls, causing parasitic core cooling.
How Does the Bremsstrahlung Radiation Loss Calculator (Fusion Plasma) Work?
Volumetric power loss scales as ne² · √Te · Zeff.
Because radiation scales with Z², even tiny fractions of high-Z impurities (such as sputtered tungsten Z=74 or iron Z=26) drastically increase radiative cooling and prevent ignition.
Bremsstrahlung Radiation Loss Calculator (Fusion Plasma) Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
Models quantum electrodynamic dipole radiation emitted during electron-ion scattering.
How to Use the Bremsstrahlung Radiation Loss Calculator (Fusion Plasma)
- Enter electron density and temperature.
- Specify Zeff from spectroscopic diagnostics.
- Input the plasma volume to determine total Megawatts radiated.
Step-by-Step Example Calculation
ITER-Scale Plasma: 800 m³ at 12 keV
Input Values:
Understanding Your Result
Ptotal indicates the continuous X-ray heat load on plasma-facing first-wall armor.
This power must be continuously compensated by fusion alpha-particle self-heating.
Factors That Affect the Result
- Zeff: Impurities are the most dangerous threat to fusion; clean fuel with Zeff close to 1.0 is essential.
When Should You Use This Calculator?
- Calculating thermal loads on divertor and first-wall armor tiles.
- Evaluating core radiative cooling limits for advanced aneutronic fuels (D-³He, p-¹¹B).
Assumptions & Limitations
- Assumes Born approximation thermal Bremsstrahlung and ignores synchrotron/cyclotron radiation.
Frequently Asked Questions
Calculation Accuracy & Reference Note
Standard NRL Plasma Formulary equation.