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CEBAF reaches 150% of its design energy

21 September 2000

Jefferson Laboratory’s CEBAF accelerator, which was originally designed to
provide 4 GeV continuous-wave electron beams, has demonstrated 6 GeV
continuous-wave operation. In early August the superconducting
radiofrequency (SRF) machine reached 6.07 GeV at a substantial current of
109 mA.

Energies in the 5.65 GeV range
had already become routine as a result of incremental improvements since
CEBAF began operation in the mid-1990s. Once 6 GeV has become the
routine energy level, nuclear physics users will capitalize on it during the
coming years, pending the completion of a proposed 12 GeV upgrade, which
is to be discussed later this year by the US Nuclear Science Advisory
Committee.

The Jefferson Laboratory’s SRF electron-acceleration
technology also drives the laboratory’s Infrared Demonstrator Free-Electron
Laser and is now beginning to see application elsewhere as well. Under a $70
million contract, the laboratory is providing SRF and related cryogenic
engineering, assembly and installation support for the Spallation Neutron
Source project at Oak Ridge National Laboratory, Tennessee.

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