Mesh

There are two output files containing mesh parameters (the 5D mesh consists of a 3D unstructured triangular mesh in configuration space and a 2D structured rectangular grid in velocity space): xgc.f0.mesh.bp and xgc.mesh.bp.

Remarks

These files contain quantities that can be useful to calculate various averages.

# flux surfaces here includes the scrape-off layer, i.e. the open field-line region.

xgc.f0.mesh.bp
Printed when: sml_f0_grid=.true..   Output frequency: once at start/restart.

Output	Dimension	Units	Description
f0_T_ev	\(N_{\mathrm{species}}~\times\) # 3D mesh nodes	\(\mathrm{eV}\)	Temperature at start in all configuration space vertices for electrons (0) and ions (1).
f0_den	# 3D mesh nodes	\({\mathrm{m}}^{-3}\)	Density at start in all configuration space vertices. Is n_e = n_i assumed?
f0_dsmu	Scalar	\(v_{Ts} = \sqrt{\frac{T_s}{m_s}}\)	\(\Delta v_{\perp}\) in the 2D velocity grid of species \(s\).
f0_dvp	Scalar	\(v_{Ts} = \sqrt{\frac{T_s}{m_s}}\)	\(\Delta v_{\|}\) in the 2D velocity grid of species \(s\).
f0_grid_vol_vonly	\(N_{\mathrm{species}}~\times\) # 3D mesh nodes	Units	Prefactor for calculating velocity space moments. \(= \left( T_s/\sqrt{2 \pi} \right) \times \) \(\times\) dvp_n. Note that mu_vol and vp_vol are different and not included. In calculating density moment, for example: \(n_s(k)=\) f0_grid_vol_vonly(k) \(\sum_{i,j}\) mu_vol(i) vp_vol(j) f(i,j,k)
f0_nmu	Scalar	Positive integer	Number of grid points in \(v_{\perp}\) in the 2D velocity grid is f0_nmu + 1. Same as input parameter f0_nmu.
f0_nvp	Scalar	Positive integer	Number of grid points in \(v_{\|}\) in the 2D velocity grid is 2 \(\times\) f0_nvp + 1. Same as input parameter f0_nvp.
f0_smu_max	Scalar	\(v_{Ts} = \sqrt{\frac{T_s}{m_s}}\)	Maximum \(v_{\perp}\) in the 2D velocity grid (minimum is \(0\)). Same as input parameter f0_smu_max.
f0_vp_max	Scalar	\(v_{Ts} = \sqrt{\frac{T_s}{m_s}}\)	Maximum/minimum \(v_{\|}\) (minimum with minus sign) in the 2D velocity grid. Same as input parameter f0_vp_max.
gradpsi	# 3D mesh nodes \(\times\) 2	Units	Description
inode1m1	Scalar	Units	Description
n_n	Scalar	Positive integer	Number of 3D mesh nodes.
nb_curl_nb	# 3D mesh nodes	Units	Description
ndata	Scalar	Positive integer	Description
nsp	Scalar	Positive integer	Number of kinetic species.
v_curv	# 3D mesh nodes \(\times\) 3	Units	Description
v_gradb	# 3D mesh nodes \(\times\) 3	Units	Description

xgc.mesh.bp
Printed when: always.   Output frequency: once at start/restart.

* Dimension only for stellarator simulations.