/usr/share/doc/xmds/examples/tla.xmds is in xmds 1.6.6-4.
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<!--Two Level Atom Example simulation to illustrate a cross propagating field-->
<!-- $Id: tla.xmds 1526 2007-08-21 17:30:14Z paultcochrane $ -->
<!-- Copyright (C) 2000-2007 -->
<!-- -->
<!-- Code contributed by Greg Collecutt, Joseph Hope and Paul Cochrane -->
<!-- -->
<!-- This file is part of xmds. -->
<!-- -->
<!-- This program is free software; you can redistribute it and/or -->
<!-- modify it under the terms of the GNU General Public License -->
<!-- as published by the Free Software Foundation; either version 2 -->
<!-- of the License, or (at your option) any later version. -->
<!-- -->
<!-- This program is distributed in the hope that it will be useful, -->
<!-- but WITHOUT ANY WARRANTY; without even the implied warranty of -->
<!-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -->
<!-- GNU General Public License for more details. -->
<!-- -->
<!-- You should have received a copy of the GNU General Public License -->
<!-- along with this program; if not, write to the Free Software -->
<!-- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, -->
<!-- MA 02110-1301, USA. -->
<simulation>
<name>tla</name>
<author>Unknown Author</author>
<description>
Two level atom example simulation. Illustrates a
cross-propagating field.
</description>
<!-- Global system parameters and functionality -->
<prop_dim>z</prop_dim>
<!-- Global variables for the simulation -->
<globals>
<![CDATA[
const double g = 1;
const double t0 = 1;
]]>
</globals>
<!-- Field to be integrated over -->
<field>
<dimensions> t </dimensions>
<lattice> 10000 </lattice>
<domains> (-10,15) </domains>
<samples>1 0</samples>
<vector>
<name>main</name>
<type>double</type>
<components>E</components>
<![CDATA[
E = 2/t0/cosh(t/t0);
]]>
</vector>
<vector>
<name>cross</name>
<type>double</type>
<components>P N</components>
<![CDATA[
P = 0;
N = -1;
]]>
</vector>
</field>
<!-- The sequence of integrations to perform -->
<sequence>
<integrate>
<algorithm>RK4IP</algorithm>
<interval>4</interval>
<lattice>200</lattice>
<samples>50 50</samples>
<vectors>main cross</vectors>
<![CDATA[
dE_dz = g*P;
]]>
<cross_propagation>
<vectors>cross</vectors>
<prop_dim>t</prop_dim>
<![CDATA[
dP_dt = E*N;
dN_dt = -E*P;
]]>
</cross_propagation>
</integrate>
</sequence>
<!-- The output to generate -->
<output format="ascii" precision="double">
<group>
<sampling>
<lattice>50</lattice>
<moments>pow_dens</moments>
<![CDATA[
pow_dens = E*E;
]]>
</sampling>
</group>
<group>
<sampling>
<vectors>main cross</vectors>
<lattice>50</lattice>
<moments>P_out N_out</moments>
<![CDATA[
P_out = P;
N_out = N;
]]>
</sampling>
</group>
</output>
</simulation>
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