CEBAF progress report

At the Continuous Electron Beam Accelerator Facility, under construction in Newport News, Virginia, a pair of 400 MeV superconducting linacs interconnected for five-pass recirculation will provide 4-GeV, 200-μA, cw electron beams to simultaneous nuclear physics experiments in three end stations. As of August 1990, the first production-version cryomodule has been successfully tested, the injector's initial superconducting quarter-cryomodule has accelerated beam to the required 5 MeV, and industry has supplied the first production accelerating cavities, klystrons, cryomodule components, and other hardware. The first section of the 1,400-m, cast-in-place, racetrack-shaped tunnel was occupied in January, the entire racetrack was completed in June, and occupancy will proceed in stages through late 1990. Installation has advanced on the helium transfer, accelerator control, and personnel safety systems. Injector installation is under way, with systems tests to 25 MeV to commence late this fall. Commissioning of the 4800-W, 2-K central helium refrigerator has begun. The Program Advisory Committee has approved initial nuclear physics experiments, the experimental equipment conceptual design is complete, the first major spectrometer components are out for bid, and end station construction has begun. Project completion is scheduled for 1993, with first physics in 1994. Construction cost is $265M