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BUGFIX - Corrects beta_n calculation in core.py #34

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Merged
ebursch merged 1 commit into from
Aug 26, 2026
Merged

BUGFIX - Corrects beta_n calculation in core.py #34

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8 changes: 6 additions & 2 deletions openpopcon/core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@
Contributors:
- Matthew Pharr (2024-07-09)
- Alexei Zhurba (2025-04-04)
- Evan Bursch (2026-08-26)

"""

Expand Down Expand Up @@ -439,11 +440,14 @@ def BetaN(s, T_i_keV, n_e_20) -> float:

beta = 2 mu0 <P> / (B^2)
<P> = int P dV / V (average pressure)
Since Pressure per m^3 is n_eT_e+n_iT_i,
and W_tot per m^3 is 3/2 (n_eT_e+n_iT_i),
P = 2/3 W_tot
beta_N = beta a B0 / (Ip)
"""
P_avg = (
1e6
* volume_integral(s, s.sqrtpsin, _W_tot_prof(s, s.sqrtpsin, T_i_keV, n_e_20))
* volume_integral(s, s.sqrtpsin, (2/3) * _W_tot_prof(s, s.sqrtpsin, T_i_keV, n_e_20))
/ s.V
)
beta = 2 * (4e-7 * np.pi) * P_avg / (s.B0**2)
Expand Down Expand Up @@ -511,7 +515,7 @@ def tauE_H89(s, Pheat, n_e_20) -> float:
@nb.njit(cache=True)
def _W_tot_prof(s, rho, T_i_keV: float, n_e_20: float):
"""
Plasma energy per cubic meter; also pressure.
Plasma energy per cubic meter.
"""
n_e_r = 1e20 * n_e_20 * get_profile(s, rho, 1)
T_e_r = T_i_keV * get_profile(s, rho, 4) / s.tipeak_over_tepeak
Expand Down
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