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Precise and accurate measurements of the beam energy delivered to theexperimental halls at the Thomas Jefferson Accelerator Facility (Jefferson Lab)is required by many experiments for proper data analysis and physics eventreconstruction. During the 6 GeV era of Jefferson Lab, the energy delivered toexperimental Hall A was determined to 2E-4 dE/E with multiple measurements; butafter the machine was upgraded to 12 GeV, the accelerator's beam energycalculations needed to be re-calibrated. In order to link the 6 GeV eracalibrations to the 12 GeV era, the Hall A ARC energy measurement system wasleft unmodified. After the upgrade, this system was used to determine theabsolute beam energy being delivered into Hall A and find the new calibrationsfor the main machine. To ensure the validity of these results, they have beencross checked using elastic scattering data as well as spin precession data.

Precise Beam Energy Determination for Hall A after the CEBAF 12 GeV Upgrade