pancake.pancake Namespace Reference

Classes
class	PancakeCurve

Functions
Lead	_make_lead (spec, float release, float kappa_n_junction)

Detailed Description

Composite base curve of a pancake coil: inner lead + planar spiral + outer lead.

The whole curve is parametrized by its arc length s in [0, L]:

    [0, L_in]                inner lead (from the inner connector into the winding)
    [L_in, L_in + L_sp]      planar spiral
    [L_in + L_sp, L]         outer lead (from the winding to the outer connector)

Both leads are *described* in the direction that leaves the coil (that is the
natural way to think about a terminal: "go straight, twist by 90 degrees, bend
up, go straight").  For the inner lead this description is integrated
backwards from the start of the spiral with the leaving frame

    T_L = -T(0),  n_L = -n(0),  b_L = b(0)

so that the tape width b still points along +z when the description starts.
The resulting piece is then reversed to obtain the forward parametrization.
Reversal flips the sign of the odd derivatives (v, jerk), of T and n and of
kappa_n, and keeps a, b, kappa_g and tau (see the docstring of `_inner`).

Function Documentation

_make_lead()

Lead _make_lead ( spec, float release, float kappa_n_junction )

protected