The equation below describes a helical toroid

I need a way to define pitch and chirality, if someone can please help me with these functions.

<cos(t)(R_{1}+R_{2}cos(βt)),sin(t)(R_{1}+R_{2}cos(βt)),R_{2}sin(βt)>

for example - a helical toroid with 100 turns (3.6° pitch) and left handed chirality

I assumeRis the radius of the torus and_{1}Ris the radius of the helical cross section_{2}

or.. the other way around (?) - I don't know.. do you know?

I could not find any explanation for(t)or(βt)either

I have no idea where to begin, I am not a mathematician,

I'm a designer and just need an equation for pitch and chirality functions for a design project.

any help would be appreciated.

Thanks!