Abstract
CEBAF, the Continuous Electron Beam Accelerator Facility, has been actively serving the nuclear physics research community as a unique forefront international resource since 1995. This CW electron linear accelerator (linac) at the U.S. Department of Energy's Thomas Jefferson National Accelerator Facility (Jefferson Lab) has continued to evolve as a precision tool for discerning the structure and dynamics within nuclei. Superconducting RF (SRF) technology has been the essential foundation for CEBAF, first as a 4 GeV machine, then 6 GeV, and currently capable of 12 GeV. We review the development, implementation, and performance of SRF systems for CEBAF from its early beginnings to the commissioning of the 12 GeV era.
Highlights
The core mission of Jefferson Lab is research to understand how the nucleon’s behavior when interacting with other particles changes from that of an independent entity to that of three interacting quarks
Implementation, and performance of Superconducting rf (SRF) systems for CEBAF from its early beginnings to the commissioning of the 12 GeV era
On February 13, 1987, construction started on CEBAF, a 4-GeV, 200-μA, continuous beam, electron accelerator facility designed for nuclear physics research
Summary
The core mission of Jefferson Lab is research to understand how the nucleon’s behavior when interacting with other particles changes from that of an independent entity to that of three interacting quarks. There are two key application drivers that push one to consider employing the complexity of continuous wave (cw) superconducting radio frequency (SRF) technology. Multiple feedback loops in the low level rf controls allow the creation of beams with high precision energy definition. From the mid-1970’s nuclear physics interests had clearly established a need for beams of multi-GeV electrons with which to probe nuclear structure with precision. Event rates, very narrowly discriminated kinematics with less than one event per electron bunch on target. This need encourages a solution with very high bunch repetition rate and relatively low charge per bunch. A fundamental rf frequency of 1497 MHz allows for three simultaneous bunch trains serving three independent experimental halls, each bunch train having independent current amplitude
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