desc.basis.FourierSeries

class desc.basis.FourierSeries(N, NFP=1, sym=False)Source

1D basis set for use with the magnetic axis.

Fourier series in the toroidal coordinate.

Parameters:

• N (int) – Maximum toroidal resolution.

• NFP (int) – number of field periods

• sym ({'cos', 'sin', False}) –

  • 'cos' for cos(m*t-n*z) symmetry

  • 'sin' for sin(m*t-n*z) symmetry

  • False for no symmetry (Default)

Methods

change_resolution(N[, NFP, sym])	Change resolution of the basis to the given resolutions.
copy([deepcopy])	Return a (deep)copy of this object.
equiv(other)	Compare equivalence between DESC objects.
evaluate(nodes[, derivatives, modes, unique])	Evaluate basis functions at specified nodes.
get_idx([L, M, N, error])	Get the index of the 'modes' array corresponding to given mode numbers.
load(load_from[, file_format])	Initialize from file.
save(file_name[, file_format, file_mode])	Save the object.

Attributes

L	Maximum radial resolution.
M	Maximum poloidal resolution.
N	Maximum toroidal resolution.
NFP	Number of field periods.
modes	Mode numbers [l,m,n].
num_modes	Total number of modes in the spectral basis.
spectral_indexing	Type of indexing used for the spectral basis.
sym	{'cos', 'sin', False} Type of symmetry.