A detector from Jefferson Lab's Experimental Hall B.

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Experimental Hall B

Jefferson Lab has three experimental halls. Hall B is the smallest of the three experimental staging areas. It is 98 feet in diameter and 65 feet from floor to ceiling.

Experiments run in Hall B can receive electron beam or a photon beam. It is equipped with the CEBAF Large Acceptance Spectrometer, or CLAS. It is shaped like an elongated sphere, with the beam entering the target through a recessed notch. When the beam interacts with a target, the particles coming from the target are spread out by a large superconducting magnet and are recorded by the layers of detectors in the sphere.

Major research programs in Hall B include measuring the electromagnetic excitations of hadrons to understand confinement, performing three-dimensional imaging of nucleon quark structure, studying quark-gluon interactions in nuclei, characterizing nucleon-nucleon correlations in nuclei and searching for the existence of heavy photons.

An international collaboration of scientists participate in experiments carried out in Hall B. Hall collaborators represent more than 60 institutions and 26 countries. 

For more detailed information about Hall B and its experiments, click here.