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Looking at the wakefields with gd1.pp

We start gd1.pp and issue the commands:

 -general
      infile= @last
 -3darrow
     symbol= e_30
     arrows= 30000
   doit

The resulting screen is shown in figure 10.1.

**Figure 10.1:** Screenshot of the desktop showing the matrialdistribution and the wakefield at some time. We cannot see the wakefield, since the material boundaries hide the field.
$\begin{figure}\centerline{ \psfig{figure=3d-wakefield00.PS,width=608pt} }\end{figure}$

We only see the material approximation. The field is plotted inside, but we cannot see it, since the plotted material boundaries hide the field. We have several possibilities to look at the field: There is an option in this section -3darrowplot. With this option we can switch on or off the plotting of the material boundaries: materials= yes|no. The default value is materials= yes. We select

 materials= no
 doit

Now we see the field, but no material anywhere. The resulting plot is shown in figure 10.2.

**Figure 10.2:** Screenshot of the desktop when we switched off the plotting of the material-boundaries.
$\begin{figure}\centerline{ \psfig{figure=3d-wakefield01.PS,width=608pt} }\end{figure}$

We have another option to look inside the geometry. We can select that we only want to see the field and the material boundaries that are lying within some bounding box. We switch on the plotting of the materials again and specify that we do not want to see anything above z=0:

 materials= yes
 bbzhigh= 0      # don't plot anything above z=0

The resulting plot is shown in figure 10.3.

**Figure 10.3:** Screenshot of the desktop when we switched on the plotting of the material-boundaries, but selected bbzhigh=0.
$\begin{figure}\centerline{ \psfig{figure=3d-wakefield02.PS,width=608pt} }\end{figure}$

Next: Looking at the wakepotentials Up: Analysing the results with Previous: Analysing the results with