Target Conditions

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Target History

The purpose of this page is to record the history of the target conditions for the GlueX experiment. Every time that the target is changed or moved, the table below must be updated with four pieces of information

  • What target is installed. An integer corresponding to the target type table in Target Types must be used.
  • The z position in the GlueX coordinate system in units of cm.
  • The data and time that the target was modified
  • Who recorded this information
Target Type Index Target Position (in z, cm) Inserted Date/Time Removed Date/Time Recorded By
0 65 cm 2014-10-10 2014-10-28 15:08 Alexandre Deur
3 65 cm 2014-10-28 15:08 2014-11-07 05:00 Alexandre Deur
7 65 cm 2014-11-07 05:00 2014-11-11 11:00 Elton Smith
3 65 cm 2014-11-11 11:00 2015-02-06 12:00 (est.) Alexandre Deur
1* 65 cm 2015-02-06 12:00 (est.) current Sean Dobbs
  • The 10 cm CH2 target was mounted on the nose of the Start Counter for the Spring 2015 run.

Target Types

This table describes which target types correspond to which target index number. The canonical source of this information is the CCDB table /TARGET/target_type_list

Index Description
0 no target
1 30 cm LH2
2 2mm CH2
3 10 mm CH2
4 CH2 cup (2mm/7mm)
5 3.4 mm graphite
6 Al. cross
7 Al. cylinder w/ triangle hole

Updating the CCDB

The CCDB stores the target type and position for use in simulation and reconstruction software. A convenient script can be used to update the CCDB, which can be found at


Users must be part of the "halld" user group to update the CCDB.

To update the target conditions in the CCDB, pass the target type and position (in cm), for example 2 68.

The current list of target types can be obtained using the -P option -P

The -h option will print some help on the command line.

Updating the mapping between target indices and types (/TARGET/target_type_list) should only be done in consultation with software experts (S. Dobbs and M. Ito).