CEBAF: Project Status and Front End Test Results

Construction of the CEBAF five-pass recirculating linear accelerator is in the final stages of installation and subsystem commissioning. First beam to an experimental hall is planned for early 1994. The current project status is briefly reviewed. The front end accelerator, a 45 MeV linac composed of a 5 MeV superconducting injector and two standard CEBAF accelerator cryomodules, each containing eight 5-cell, 1497 MHz superconducting cavities, has been in operation over 3000 hours for commissioning studies. The cavities are operated at an average accelerating gradient of 5 MeV/m. This accelerator has delivered 45 MeV, 200 micro-amp CW beam with both transverse and longitudinal emittances meeting design specifications. CW beam has been recirculated through the two cryomodules to reach a final energy of 80 MeV. Energy recovery at an average accelerating gradient of 5 MeV/m has also been accomplished with CW beam. The recirculation experiment demonstrates that the full CEBAF accel