Quantities for Postprocessing

GVEC provides a number of built-in quantities for postprocessing an equilibrium. These can be used with the compute, evaluate and evaluate_sfl functions.

Table of built-in quantities

label	long name	symbol
A_surface	surface area	\(A_\text{surface}\)
B	magnetic field	\(\mathbf{B}\)
B_contra_t	poloidal component of the magnetic field	\(B^\theta\)
B_contra_t_B	contravariant \(\theta\) component of the magnetic field in Boozer coordinates	\(B^{\theta_B}\)
B_contra_t_P	contravariant \(\theta\) component of the magnetic field in PEST coordinates	\(B^{\theta_P}\)
B_contra_z	toroidal component of the magnetic field	\(B^\zeta\)
B_contra_z_B	contravariant \(\zeta\) component of the magnetic field in Boozer coordinates	\(B^{\zeta_B}\)
B_rho_B	\(\rho\) component of the magnetic field in Boozer coordinates	\(B_{\rho_B}\)
B_rho_P	\(\rho\) component of the magnetic field in PEST coordinates	\(B_{\rho_P}\)
B_theta_B	\(\theta\) component of the magnetic field in Boozer coordinates	\(B_{\theta_B}\)
B_theta_P	\(\theta\) component of the magnetic field in PEST coordinates	\(B_{\theta_P}\)
B_theta_avg	flux-surface averaged poloidal magnetic field	\(\overline{B_\theta}\)
B_zeta_B	\(\zeta\) component of the magnetic field in Boozer coordinates	\(B_{\zeta_B}\)
B_zeta_P	\(\zeta\) component of the magnetic field in PEST coordinates	\(B_{\zeta_P}\)
B_zeta_avg	flux-surface averaged toroidal magnetic field	\(\overline{B_\zeta}\)
D_Merc	Mercier criterion	\(D_\text{Merc}\)
D_Merc_Curr	Current contribution to the Mercier criterion	\(D_\text{M,Curr}\)
D_Merc_Geod	Geodesic contribution to the Mercier criterion	\(D_\text{M,Geod}\)
D_Merc_Shear	Shear contribution to the Mercier criterion	\(D_\text{M,Shear}\)
D_Merc_Well	Magnetic well contribution to the Mercier criterion	\(D_\text{M,Well}\)
F	MHD force	\(F\)
F_r_avg	radial force balance	\(\overline{F_\rho}\)
II_tt	poloidal component of the second fundamental form	\(\mathrm{II}_{\theta\theta}\)
II_tt_B	t,t component of the second fundamental form in Boozer coordinates	\(\mathrm{II}_{\theta_B \theta_B}\)
II_tt_P	t,t component of the second fundamental form in PEST coordinates	\(\mathrm{II}_{\theta_P \theta_P}\)
II_tz	poloidal-toroidal component of the second fundamental form	\(\mathrm{II}_{\theta\zeta}\)
II_tz_B	t,z component of the second fundamental form in Boozer coordinates	\(\mathrm{II}_{\theta_B \zeta_B}\)
II_tz_P	t,z component of the second fundamental form in PEST coordinates	\(\mathrm{II}_{\theta_P \zeta_P}\)
II_zz	toroidal component of the second fundamental form	\(\mathrm{II}_{\zeta\zeta}\)
II_zz_B	z,z component of the second fundamental form in Boozer coordinates	\(\mathrm{II}_{\zeta_B \zeta_B}\)
II_zz_P	z,z component of the second fundamental form in PEST coordinates	\(\mathrm{II}_{\zeta_P \zeta_P}\)
I_pol	poloidal current, relative to the magnetic axis	\(I_\text{pol}\)
I_tor	toroidal current enclosed by flux surface	\(I_\text{tor}\)
J	current density	\(\mathbf{J}\)
J_contra_r	contravariant radial current density	\(J^{\rho}\)
J_contra_t	contravariant poloidal current density	\(J^{\theta}\)
J_contra_t_B	contravariant \(\theta\) component of the current density in Boozer coordinates	\(J^{\theta_B}\)
J_contra_t_P	contravariant \(\theta\) component of the current density in PEST coordinates	\(J^{\theta_P}\)
J_contra_z	contravariant toroidal current density	\(J^{\zeta}\)
J_contra_z_B	contravariant \(\zeta\) component of the current density in Boozer coordinates	\(J^{\zeta_B}\)
J_rho_B	\(\rho\) component of the current density in Boozer coordinates	\(J_{\rho_B}\)
J_rho_P	\(\rho\) component of the current density in PEST coordinates	\(J_{\rho_P}\)
J_theta_B	\(\theta\) component of the current density in Boozer coordinates	\(J_{\theta_B}\)
J_theta_P	\(\theta\) component of the current density in PEST coordinates	\(J_{\theta_P}\)
J_zeta_B	\(\zeta\) component of the current density in Boozer coordinates	\(J_{\zeta_B}\)
J_zeta_P	\(\zeta\) component of the current density in PEST coordinates	\(J_{\zeta_P}\)
Jac	Jacobian determinant	\(\mathcal{J}\)
Jac_B	Jacobian determinant in Boozer coordinates	\(\mathcal{J}_B\)
Jac_P	Jacobian determinant in PEST coordinates	\(\mathcal{J}_P\)
Jac_h	reference Jacobian determinant	\(\mathcal{J}_h\)
Jac_l	logical Jacobian determinant	\(\mathcal{J}_l\)
LA	straight field line potential	\(\lambda\)
L_axis	length of the magnetic axis	\(L_\text{axis}\)
L_gradB	magnetic gradient scale length	\(L_{\nabla\mathbf{B}}\)
N_FP	number of field periods	\(N_\text{FP}\)
Phi	toroidal magnetic flux	\(\Phi\)
Phi_edge	toroidal magnetic flux at the edge	\(\Phi_0\)
V	volume	\(V\)
W_MHD	total MHD energy	\(W_\text{MHD}\)
X1	first reference coordinate	\(X^1\)
X2	second reference coordinate	\(X^2\)
aspect_ratio	effective aspect ratio	\(a_\text{eff}\)
beta_avg	volume-averaged plasma beta	\(\overline{\beta}\)
chi	poloidal magnetic flux	\(\chi\)
dA	differential area element	\(dA\)
dB_contra_t_dr	radial derivative of the poloidal magnetic field	\(\frac{\partial B^\theta}{\partial \rho}\)
dB_contra_t_dt	poloidal derivative of the poloidal magnetic field	\(\frac{\partial B^\theta}{\partial \theta}\)
dB_contra_t_dz	toroidal derivative of the poloidal magnetic field	\(\frac{\partial B^\theta}{\partial \zeta}\)
dB_contra_z_dr	radial derivative of the toroidal magnetic field	\(\frac{\partial B^\zeta}{\partial \rho}\)
dB_contra_z_dt	poloidal derivative of the toroidal magnetic field	\(\frac{\partial B^\zeta}{\partial \theta}\)
dB_contra_z_dz	toroidal derivative of the toroidal magnetic field	\(\frac{\partial B^\zeta}{\partial \zeta}\)
dB_dr	radial derivative of the magnetic field	\(\frac{\partial \mathbf{B}}{\partial \rho}\)
dB_dt	poloidal derivative of the magnetic field	\(\frac{\partial \mathbf{B}}{\partial \theta}\)
dB_dz	toroidal derivative of the magnetic field	\(\frac{\partial \mathbf{B}}{\partial \zeta}\)
dB_theta_avg_dr	derivative of the flux-surface averaged poloidal magnetic field	\(\frac{d\overline{B_\theta}}{d\rho}\)
dI_tor_dr	derivative of the toroidal current enclosed by the flux surface	\(\frac{dI_\text{tor}}{d\rho}\)
dJac_dr	radial derivative of the Jacobian determinant	\(\frac{\partial \mathcal{J}}{\partial \rho}\)
dJac_dt	poloidal derivative of the Jacobian determinant	\(\frac{\partial \mathcal{J}}{\partial \theta}\)
dJac_dz	toroidal derivative of the Jacobian determinant	\(\frac{\partial \mathcal{J}}{\partial \zeta}\)
dJac_h_dr	radial derivative of the reference Jacobian determinant	\(\frac{\partial \mathcal{J}_h}{\partial \rho}\)
dJac_h_dt	poloidal derivative of the reference Jacobian determinant	\(\frac{\partial \mathcal{J}_h}{\partial \theta}\)
dJac_h_dz	toroidal derivative of the reference Jacobian determinant	\(\frac{\partial \mathcal{J}_h}{\partial \zeta}\)
dJac_l_dr	radial derivative of the logical Jacobian determinant	\(\frac{\partial \mathcal{J}_l}{\partial \rho}\)
dJac_l_dt	poloidal derivative of the logical Jacobian determinant	\(\frac{\partial \mathcal{J}_l}{\partial \theta}\)
dJac_l_dz	toroidal derivative of the logical Jacobian determinant	\(\frac{\partial \mathcal{J}_l}{\partial \zeta}\)
dLA_dr	radial derivative of the straight field line potential	\(\frac{\partial \lambda}{\partial \rho}\)
dLA_drr	second radial derivative of the straight field line potential	\(\frac{\partial^2 \lambda}{\partial \rho^2}\)
dLA_drt	radial-poloidal derivative of the straight field line potential	\(\frac{\partial^2 \lambda}{\partial \rho\partial \theta}\)
dLA_drz	radial-toroidal derivative of the straight field line potential	\(\frac{\partial^2 \lambda}{\partial \rho\partial \zeta}\)
dLA_dt	poloidal derivative of the straight field line potential	\(\frac{\partial \lambda}{\partial \theta}\)
dLA_dtt	second poloidal derivative of the straight field line potential	\(\frac{\partial^2 \lambda}{\partial \theta^2}\)
dLA_dtz	poloidal-toroidal derivative of the straight field line potential	\(\frac{\partial^2 \lambda}{\partial \theta\partial \zeta}\)
dLA_dz	toroidal derivative of the straight field line potential	\(\frac{\partial \lambda}{\partial \zeta}\)
dLA_dzz	second toroidal derivative of the straight field line potential	\(\frac{\partial^2 \lambda}{\partial \zeta^2}\)
dNU_B_dt	poloidal derivative of the Boozer potential computed from the magnetic field	\(\left.\frac{\partial \nu_B}{\partial \theta}\right|_\text{def.}\)
dNU_B_dz	toroidal derivative of the Boozer potential computed from the magnetic field	\(\left.\frac{\partial \nu_B}{\partial \zeta}\right|_\text{def.}\)
dPhi_dr	toroidal magnetic flux gradient	\(\frac{d\Phi}{d\rho}\)
dPhi_drr	toroidal magnetic flux curvature	\(\frac{d^2\Phi}{d\rho^2}\)
dV_dPhi_n	derivative of the plasma volume w.r.t. normalized toroidal magnetic flux	\(\frac{dV}{d\Phi_n}\)
dV_dPhi_n2	second derivative of the plasma volume w.r.t. normalized toroidal magnetic flux	\(\frac{d^2V}{d\Phi_n^2}\)
dX1_dr	radial derivative of the first reference coordinate	\(\frac{\partial X^1}{\partial \rho}\)
dX1_drr	second radial derivative of the first reference coordinate	\(\frac{\partial^2 X^1}{\partial \rho^2}\)
dX1_drt	radial-poloidal derivative of the first reference coordinate	\(\frac{\partial^2 X^1}{\partial \rho\partial \theta}\)
dX1_drz	radial-toroidal derivative of the first reference coordinate	\(\frac{\partial^2 X^1}{\partial \rho\partial \zeta}\)
dX1_dt	poloidal derivative of the first reference coordinate	\(\frac{\partial X^1}{\partial \theta}\)
dX1_dtt	second poloidal derivative of the first reference coordinate	\(\frac{\partial^2 X^1}{\partial \theta^2}\)
dX1_dtz	poloidal-toroidal derivative of the first reference coordinate	\(\frac{\partial^2 X^1}{\partial \theta\partial \zeta}\)
dX1_dz	toroidal derivative of the first reference coordinate	\(\frac{\partial X^1}{\partial \zeta}\)
dX1_dzz	second toroidal derivative of the first reference coordinate	\(\frac{\partial^2 X^1}{\partial \zeta^2}\)
dX2_dr	radial derivative of the second reference coordinate	\(\frac{\partial X^2}{\partial \rho}\)
dX2_drr	second radial derivative of the second reference coordinate	\(\frac{\partial^2 X^2}{\partial \rho^2}\)
dX2_drt	radial-poloidal derivative of the second reference coordinate	\(\frac{\partial^2 X^2}{\partial \rho\partial \theta}\)
dX2_drz	radial-toroidal derivative of the second reference coordinate	\(\frac{\partial^2 X^2}{\partial \rho\partial \zeta}\)
dX2_dt	poloidal derivative of the second reference coordinate	\(\frac{\partial X^2}{\partial \theta}\)
dX2_dtt	second poloidal derivative of the second reference coordinate	\(\frac{\partial^2 X^2}{\partial \theta^2}\)
dX2_dtz	poloidal-toroidal derivative of the second reference coordinate	\(\frac{\partial^2 X^2}{\partial \theta\partial \zeta}\)
dX2_dz	toroidal derivative of the second reference coordinate	\(\frac{\partial X^2}{\partial \zeta}\)
dX2_dzz	second toroidal derivative of the second reference coordinate	\(\frac{\partial^2 X^2}{\partial \zeta^2}\)
dchi_dr	poloidal magnetic flux gradient	\(\frac{d\chi}{d\rho}\)
dchi_drr	poloidal magnetic flux curvature	\(\frac{d^2\chi}{d\rho^2}\)
dg_rr_dr	radial derivative of the rr component of the metric tensor	\(\frac{\partial g_{\rho\rho}}{\partial \rho}\)
dg_rr_dt	poloidal derivative of the rr component of the metric tensor	\(\frac{\partial g_{\rho\rho}}{\partial \theta}\)
dg_rr_dz	toroidal derivative of the rr component of the metric tensor	\(\frac{\partial g_{\rho\rho}}{\partial \zeta}\)
dg_rt_dr	radial derivative of the rt component of the metric tensor	\(\frac{\partial g_{\rho\theta}}{\partial \rho}\)
dg_rt_dt	poloidal derivative of the rt component of the metric tensor	\(\frac{\partial g_{\rho\theta}}{\partial \theta}\)
dg_rt_dz	toroidal derivative of the rt component of the metric tensor	\(\frac{\partial g_{\rho\theta}}{\partial \zeta}\)
dg_rz_dr	radial derivative of the rz component of the metric tensor	\(\frac{\partial g_{\rho\zeta}}{\partial \rho}\)
dg_rz_dt	poloidal derivative of the rz component of the metric tensor	\(\frac{\partial g_{\rho\zeta}}{\partial \theta}\)
dg_rz_dz	toroidal derivative of the rz component of the metric tensor	\(\frac{\partial g_{\rho\zeta}}{\partial \zeta}\)
dg_tt_dr	radial derivative of the tt component of the metric tensor	\(\frac{\partial g_{\theta\theta}}{\partial \rho}\)
dg_tt_dt	poloidal derivative of the tt component of the metric tensor	\(\frac{\partial g_{\theta\theta}}{\partial \theta}\)
dg_tt_dz	toroidal derivative of the tt component of the metric tensor	\(\frac{\partial g_{\theta\theta}}{\partial \zeta}\)
dg_tz_dr	radial derivative of the tz component of the metric tensor	\(\frac{\partial g_{\theta\zeta}}{\partial \rho}\)
dg_tz_dt	poloidal derivative of the tz component of the metric tensor	\(\frac{\partial g_{\theta\zeta}}{\partial \theta}\)
dg_tz_dz	toroidal derivative of the tz component of the metric tensor	\(\frac{\partial g_{\theta\zeta}}{\partial \zeta}\)
dg_zz_dr	radial derivative of the zz component of the metric tensor	\(\frac{\partial g_{\zeta\zeta}}{\partial \rho}\)
dg_zz_dt	poloidal derivative of the zz component of the metric tensor	\(\frac{\partial g_{\zeta\zeta}}{\partial \theta}\)
dg_zz_dz	toroidal derivative of the zz component of the metric tensor	\(\frac{\partial g_{\zeta\zeta}}{\partial \zeta}\)
diota_dr	rotational transform gradient	\(\frac{d\iota}{d\rho}\)
diota_drr	rotational transform curvature	\(\frac{d^2\iota}{d\rho^2}\)
dmod_B_dr	radial derivative of the modulus of the magnetic field	\(\frac{\partial \left|\mathbf{B}\right|}{\partial \rho}\)
dmod_B_dr_B	radial Boozer derivative of the modulus of the magnetic field	\(\frac{\partial\left|\mathbf{B}\right|}{\partial \rho_B}\)
dmod_B_dt	poloidal derivative of the modulus of the magnetic field	\(\frac{\partial \left|\mathbf{B}\right|}{\partial \theta}\)
dmod_B_dt_B	poloidal Boozer derivative of the modulus of the magnetic field	\(\frac{\partial\left|\mathbf{B}\right|}{\partial \theta_B}\)
dmod_B_dz	toroidal derivative of the modulus of the magnetic field	\(\frac{\partial \left|\mathbf{B}\right|}{\partial \zeta}\)
dmod_B_dz_B	toroidal Boozer derivative of the modulus of the magnetic field	\(\frac{\partial\left|\mathbf{B}\right|}{\partial \zeta_B}\)
dp_dr	pressure gradient	\(\frac{dp}{d\rho}\)
dp_drr	pressure curvature	\(\frac{d^2p}{d\rho^2}\)
e_q1	first reference tangent basis vector	\(\mathbf{e}_{q^1}\)
e_q2	second reference tangent basis vector	\(\mathbf{e}_{q^2}\)
e_q3	toroidal reference tangent basis vector	\(\mathbf{e}_{q^3}\)
e_rho	radial tangent basis vector	\(\mathbf{e}_\rho\)
e_rho_B	radial tangent basis vector in Boozer coordinates	\(\mathbf{e}_{\rho_B}\)
e_rho_P	poloidal tangent basis vector in PEST coordinates	\(\mathbf{e}_{\theta_P}\)
e_theta	poloidal tangent basis vector	\(\mathbf{e}_\theta\)
e_theta_B	poloidal tangent basis vector in Boozer coordinates	\(\mathbf{e}_{\theta_B}\)
e_theta_P	poloidal tangent basis vector in PEST coordinates	\(\mathbf{e}_{\theta_P}\)
e_zeta	toroidal tangent basis vector	\(\mathbf{e}_\zeta\)
e_zeta_B	toroidal tangent basis vector in Boozer coordinates	\(\mathbf{e}_{\zeta_B}\)
e_zeta_P	toroidal tangent basis vector in PEST coordinates	\(\mathbf{e}_{\zeta_P}\)
elongation	effective elongation	\(E_\text{eff}\)
g_rr	rr component of the metric tensor	\(g_{\rho\rho}\)
g_rr_B	rr component of the metric tensor in Boozer coordinates	\(g_{\rho_B \rho_B}\)
g_rr_P	rr component of the metric tensor in PEST coordinates	\(g_{\rho_P \rho_P}\)
g_rt	rt component of the metric tensor	\(g_{\rho\theta}\)
g_rt_B	rt component of the metric tensor in Boozer coordinates	\(g_{\rho_B \theta_B}\)
g_rt_P	rt component of the metric tensor in PEST coordinates	\(g_{\rho_P \theta_P}\)
g_rz	rz component of the metric tensor	\(g_{\rho\zeta}\)
g_rz_B	rz component of the metric tensor in Boozer coordinates	\(g_{\rho_B \zeta_B}\)
g_rz_P	rz component of the metric tensor in PEST coordinates	\(g_{\rho_P \zeta_P}\)
g_tt	tt component of the metric tensor	\(g_{\theta\theta}\)
g_tt_B	tt component of the metric tensor in Boozer coordinates	\(g_{\theta_B \theta_B}\)
g_tt_P	tt component of the metric tensor in PEST coordinates	\(g_{\theta_P \theta_P}\)
g_tz	tz component of the metric tensor	\(g_{\theta\zeta}\)
g_tz_B	tz component of the metric tensor in Boozer coordinates	\(g_{\theta_B \zeta_B}\)
g_tz_P	tz component of the metric tensor in PEST coordinates	\(g_{\theta_P \zeta_P}\)
g_zz	zz component of the metric tensor	\(g_{\zeta\zeta}\)
g_zz_B	zz component of the metric tensor in Boozer coordinates	\(g_{\zeta_B \zeta_B}\)
g_zz_P	zz component of the metric tensor in PEST coordinates	\(g_{\zeta_P \zeta_P}\)
gamma	adiabatic index	\(\gamma\)
grad_mod_B	gradient of the modulus of the magnetic field	\(\nabla\left|\mathbf{B}\right|\)
grad_rho	radial reciprocal basis vector	\(\nabla\rho\)
grad_theta	poloidal reciprocal basis vector	\(\nabla\theta\)
grad_theta_B	poloidal reciprocal basis vector in Boozer coordinates	\(\nabla\theta_B\)
grad_theta_P	poloidal reciprocal basis vector in PEST coordinates	\(\nabla \theta_P\)
grad_zeta	toroidal reciprocal basis vector	\(\nabla\zeta\)
grad_zeta_B	toroidal reciprocal basis vector in Boozer coordinates	\(\nabla\zeta_B\)
iota	rotational transform	\(\iota\)
iota_0	geometric contribution to the rotational transform	\(\iota_0\)
iota_avg	average rotational transform	\(\overline{\iota}\)
iota_avg2	rotational transform averaged over rho^2	\(\overline{\iota}_2\)
iota_curr	toroidal current contribution to the rotational transform	\(\iota_\text{curr}\)
iota_curr_0	factor to the toroidal current contribution to the rotational transform	\(\iota_{\text{curr},0}\)
k_q1q1	q1-q1 reference curvature vector	\(k_{q^1q^1}\)
k_q1q2	q1-q2 reference curvature vector	\(k_{q^1q^2}\)
k_q1q3	q1-q3 reference curvature vector	\(k_{q^1q^3}\)
k_q2q2	q2-q2 reference curvature vector	\(k_{q^2q^2}\)
k_q2q3	q2-q3 reference curvature vector	\(k_{q^2q^3}\)
k_q3q3	q3-q3 reference curvature vector	\(k_{q^3q^3}\)
k_rr	rr logical curvature vector	\(\mathbf{k}_{\rho\rho}\)
k_rt	rt logical curvature vector	\(\mathbf{k}_{\rho\theta}\)
k_rz	rz logical curvature vector	\(\mathbf{k}_{\rho\zeta}\)
k_tt	tt logical curvature vector	\(\mathbf{k}_{\theta\theta}\)
k_tt_B	tt boozer curvature vector	\(\mathbf{k}_{\theta_B \theta_B}\)
k_tt_P	tt PEST curvature vector	\(\mathbf{k}_{\theta_P \theta_P}\)
k_tz	tz logical curvature vector	\(\mathbf{k}_{\theta\zeta}\)
k_tz_B	tz boozer curvature vector	\(\mathbf{k}_{\theta_B \zeta_B}\)
k_tz_P	tz PEST curvature vector	\(\mathbf{k}_{\theta_P \zeta_P}\)
k_zz	zz logical curvature vector	\(\mathbf{k}_{\zeta\zeta}\)
k_zz_B	zz boozer curvature vector	\(\mathbf{k}_{\zeta_B \zeta_B}\)
k_zz_P	zz PEST curvature vector	\(\mathbf{k}_{\zeta_P \zeta_P}\)
mirror_ratio	mirror ratio	\(\Delta_\text{mirror}\)
mod_B	modulus of the magnetic field	\(\left|\mathbf{B}\right|\)
mod_F	modulus of the MHD force	\(\left|F\right|\)
mod_J	modulus of the current density	\(\left|\mathbf{J}\right|\)
mod_e_rho	modulus of the radial tangent basis vector	\(\left|\mathbf{e}_\rho\right|\)
mod_e_theta	modulus of the poloidal tangent basis vector	\(\left|\mathbf{e}_\theta\right|\)
mod_e_zeta	modulus of the toroidal tangent basis vector	\(\left|\mathbf{e}_\zeta\right|\)
mod_grad_rho	modulus of the radial reciprocal basis vector	\(\left|\nabla\rho\right|\)
mod_grad_theta	modulus of the poloidal reciprocal basis vector	\(\left|\nabla\theta\right|\)
mod_grad_zeta	modulus of the toroidal reciprocal basis vector	\(\left|\nabla\zeta\right|\)
mu0	magnetic constant	\(\mu_0\)
normal	surface normal	\(\mathbf{n}\)
p	pressure	\(p\)
pos	position vector	\(\mathbf{x}\)
r_major	effective major radius	\(r_\text{major,eff}\)
r_minor	effective minor radius	\(r_\text{minor,eff}\)
shear	global magnetic shear	\(s_g\)
shear_avg	average global magnetic shear	\(\overline{s_g}\)
shear_avg2	global magnetic shear averaged over rho^2	\(\overline{s_g}_2\)
theta_P	poloidal angle in PEST coordinates	\(\theta_P\)
vacuum_magnetic_well_depth	vacuum magnetic well depth	\(d_\text{well}\)
xyz	cartesian vector components	\((x,y,z)\)