Changeset 1222 for trunk/documents/UserDoc/DocBookUsersGuides/ForApplicationDeveloper/xml/UserActions/optionalActions.xml

Timestamp:

Dec 16, 2009, 12:14:47 PM (15 years ago)

Author:

garnier

Message:

CVS update

File:

• trunk/documents/UserDoc/DocBookUsersGuides/ForApplicationDeveloper/xml/UserActions/optionalActions.xml (modified) (2 diffs)

trunk/documents/UserDoc/DocBookUsersGuides/ForApplicationDeveloper/xml/UserActions/optionalActions.xml

@@ -27 +27 @@
 <literal>G4RunManager</literal>.
 </para>
+
+<!-- ******************* Section (Level#2) ****************** -->
+<sect2 id="sect.OptUAct.Usage">
+<title>
+Usage of User Actions
+</title>
 
 <!-- ******* Bridgehead ******* -->
@@ -401 +407 @@
 </para>
 
-
+</sect2>
+
+<!-- ******************* Section (Level#2) ****************** -->
+<sect2 id="sect.OptUAct.EngyConsv">
+<title>
+Killing Tracks in User Actions and Energy Conservation
+</title>
+
+<para>
+In either of user action classes described in the previous section, 
+the user can implement an unnatural/unphysical action. A typical 
+example is to kill a track, which is under the simulation, in the 
+user stepping action. In this case the user have to be cautious of 
+the total energy conservation. The user stepping action itself does 
+not take care the energy or any physics quantity associated with 
+the killed track. Therefore if the user want to keep the total 
+energy of an event in this case, the lost track energy need to be
+recorded by the user. 
+</para>
+
+<para>
+The same is true for user stacking or tracking actions. If the 
+user has killed a track in these actions the all physics information
+associated with it would be lost and, for example, the total energy 
+conservation be broken.  
+</para>
+
+<para>
+If the user wants the Geant4 kernel to take care the total energy
+conservation automatically when he/she has killed artificially
+a track, the user has to use a killer process. For example if the 
+user uses G4UserLimits and G4UserSpecialCuts process, energy of 
+the killed track is added to the total energy deposit.
+</para>
+
+
+</sect2>
 </sect1>