Jefferson Lab

The CEBAF accelerator delivered full-energy electrons on Dec. 14 as part of commissioning activities for the ongoing 12 GeV Upgrade project. Operators of the Continuous Electron Beam Accelerator Facility delivered the first batch of 12 GeV electrons (12.065 Giga electron Volts) to its newest experimental hall complex, Hall D.

An overhead view of Hall D, the newest experimental hall at Jefferson Lab, and part of the 12 GeV Upgrade project. On Dec. 14, operators of the Continuous Electron Beam Accelerator Facility (CEBAF) delivered 12 GeV electrons (12.065 Giga electron Volts) to the Hall D complex. Critical to the detector system is the superconducting solenoid magnet – the large red and green equipment is the solenoid.

The new CEBAF Large Acceptance Spectrometer for the 12 GeV Upgrade (CLAS12) is taking shape in Experimental Hall B. Here, the CLAS12 Torus magnet hub (center:silver hexagonal system) is installed, along with almost all of the drift chamber systems (Regions 1, 2 and 3).

In Hall C, the Super High Momentum Spectrometer (SHMS) is taking shape. Here, the Dipole magnet is being lowered to its final position in November 2016. The SHMS is being built as part of the 12 GeV Upgrade, and it will enable precision measurements of energetic particles produced in experiments in the 12 GeV era.

Staff Scientist Mark Ito talks with a group of visitors in the Hall D counting house during the open house on April 30. He briefly explained the scientific purpose of the hall to visitors, before they went into the hall. For more information and photos, click here.