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1. Create a new compact detector description XML file by copying and modifying an existing one or author a new compact description.
2. Decide on a unique name for this detector which will be denoted as DETECTOR_NAME in these instructions.
3. Create a directory called DETECTOR_NAME.
4. Copy the compact.xml file to the directory.
5. In the new compact file, change the name field to your new detector name.

   No Format
   <info name="DETECTOR_NAME"/>

   It is very important to change this tag. Otherwise, the detector conditions system will not recognize your new detector model.
6. Create a new file called detector.properties in the detector's directory, which should contain the following line.

   No Format
   name: DETECTOR_NAME

7. Make all the changes required to this compact description. Once you have a working compact description, it is advisable to permanently freeze this description and not make any more changes. If you want to change it later on, the best approach is to redo these instructions and create a new compact description and unique name.
8. Regenerate the LCDD file for your detector so events can be simulated.

   No Format
   GeomConverter/bin/GeomConverter -o lcdd compact.xml DETECTOR_NAME.lcdd

   See Converting to LCDD or HepRep using GeomConverter for instructions.
9. Generate LCIO events with this LCDD file using slic. See SLIC FAQ for instructions.
10. Setup an alias to the new detector so JAS/lcsim can find it by adding this line to the ~/.lcsim/alias.properties file.

    No Format
    DETECTOR_NAME: file:///path/to/DETECTOR_NAME

11. Finally, load a test LCIO file into JAS3. You will need to restart JAS3 for new detectors to be recognized.