Difference between revisions of "CLAS apparatus"

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=Scintillators=
 
=Scintillators=
 
=Cherenkov detector=
 
=Cherenkov detector=
The six superconducting coils placed by angles of 60 degrees in <math>\fi</math>
+
The six superconducting coils placed by angles of 60 degrees in <math>\Pi</math>
  
 
=Calorimeter=
 
=Calorimeter=

Revision as of 04:21, 11 August 2007

Apparatus

Target

The target materials used in the EG1b experiments were [math](15)NH_3[/math] and [math](15)ND_3[/math]. The first one was used for the polarized protons and the second for the polarized deuterons. These materials satisfy several conditions which are suitable for scattering experiments. Ammonia targets produce high polarization and are resistant to radiation damage(it will be changed) which can be easily repaired by an annealing process. Also,it has high ratio of free nucleons(3/18).
The target material was prepared in the following way. The ammonia gas was frozen at 77 K and then crushed into little pieces, about 1-3 mm in diameter, because it heps to have them efficiently cooled by the liquid helium during the experiment and prevent from potential damage by the beam heating.

Tracking System

Scintillators

Cherenkov detector

The six superconducting coils placed by angles of 60 degrees in [math]\Pi[/math]

Calorimeter