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    Continuing Progress with CEBAF at Jefferson Lab

    Session RP01 - Poster Session VI.
    POSTER session, Wednesday afternoon, March 24
    Exhibit Hall, GWCC

    C.E. Reece (Thomas Jefferson National Accelerator Facility)

    CEBAF, the Jefferson Lab recirculating CW electron linac driven by superconducting rf, is reliably serving the diverse needs of the medium energy physics community. CEBAF provides exceptional beam in three independent experimental halls. The relative energy stability at the design parameters of 4.0 GeV, 200 \muA CW beam was better than 3E-5 rms. Current as low as 100 pA CW has been reliably delivered to the Hall B Large Acceptance Spectrometer while over 100 \muA was sent simultaneously to Halls A or C. Experiments routinely use polarized electrons in the energy range 0.8 - 4.4 GeV. Such beams with 75% longitudinal polarization have been delivered simultaneously to all three halls. Running time is limited by funding.

    In situ processing of SRF cavities has significantly extended the energy reach of CEBAF above the capability at initial construction. With this effort, optimizing of rf systems, and a few power supply upgrades, we anticipate being able to deliver 6 GeV polarized electrons with upto 800 kW beam power. Commissioning of 5.5 GeV capability is presently being interleaved with routine physics operations at lower energies. Plans are under development for a major upgrade of CEBAF to 12 GeV in the next decade.



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