View source for Template:Incident plane wave in cylindrical coordinates

=== Incident potential ===

The incident potential is a wave of amplitude <math>A</math>
in displacement travelling in the positive <math>x</math>-direction. 
The incident potential can therefore be written as
<center>
<math>
\phi^{\mathrm{I}}  =e^{k_{0}x}\phi_{0}\left(
z\right) 
=\sum\limits_{n=-\infty}^{\infty} I_{n}(k_{0}r)\phi_{0}\left(z\right)
e^{i n \theta}
</math>
</center>