a ^ 2 \gamma} \gamma''a + k_xa - \frac { 4I} {I_a (\beta \gamma) ^ 3} \frac {1} {(a + b)} - \frac {\epsilon_x ^ 2} {a ^ 3} = 0,
   \\
   \displaystyle b '' + \frac {1} {\beta ^ 2 \gamma} \gamma 'b' + \frac {1} {2 \beta ^ 2 \gamma} \gamma''b + k_yb - \frac { 4I} {I_a (\beta \gamma) ^ 3} \frac {1} {(a + b)} - \frac {\epsilon_y ^ 2} {b ^ 3} = 0.
 \end{cases}
\end{equation*}\end{split}\]</div>
</div>
<div class="section" id="Magnetic-Lenses">
<h2>Magnetic Lenses<a class="headerlink" href="#Magnetic-Lense