Difference between revisions of "CLAS apparatus"

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Apparatus
 
Apparatus
 
=Target=
 
=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).
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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).<br>
 
The target material was prepared in the following way. The ammonia gas was frozen at 77 K and then crushed into little  
 
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.
 
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.

Revision as of 03:49, 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

Cerenkov

Calorimeter