TikZ: Bahn eines Punktes und Koordinatenliste

\documentclass[margin=5pt, tikz]{standalone}
\usepackage{tikz}
\usetikzlibrary{calc}
\usetikzlibrary{intersections}
\usepackage{amsmath, amssymb}

\begin{document}
\newcommand{\List}{}% reserve name 
\def\Range{0,20,40,60}

\foreach \w in \Range{%%%%%%%%%%%%%%%
\pgfmathsetmacro\Winkel{\w} % 
\begin{tikzpicture}[]
\coordinate[] (M) at (0,0);

\draw[] (M) circle[radius=3];
\draw[name path=kreis] (M) circle[radius=1.4];

\draw[name path=zeiger] (M) -- (90-\Winkel:3);

% Create List of Coordinates
\let\List=\empty% create list
\makeatletter
%\foreach \t  in \Range
%{
\path[name intersections={of=kreis and zeiger, name=S}] ;
\coordinate[label=left:$S_{\w}$] (X-\w) at (S-1); 
\pgfmathsetmacro\temp{"(X-\w)"}%
  \ifx\empty\List{} \xdef\List{\temp}%
  \else \xdef\List{\List \temp}%
  \fi
%}
\makeatother

\draw[red] plot[mark=*] coordinates{\List};
\node[anchor=north west, text width=6 cm] at (-3,-3){\List};
\end{tikzpicture}
}%%%%%%%%%%%%%%%%%%%%%%%%%%

\end{document}