Recent beam development for nuclear science at the MIT-bates linear accelerator center

During the past two years, two sets of high priority nuclear physics experiments, SAMPLE, and part of the Out of Plane Spectrometer (OOPS) program have been completed at the MIT-Bates Laboratory. Good progress is also being made on the next major program, the Bates Large Acceptance Spectrometer Toroid (BLAST). Research and technical innovations pursued on the accelerator complex to accomplish these experiments have established new beam delivery capabilities for nuclear science. The centerpiece of the accelerator facility is the 190 m stretcher and storage South Hall Ring (SHR). The significant new achievements are the availability of highly polarized stored or extracted electron beams, and spin manipulation capability. With a 180° Siberian Snake spin rotator, over 120 mA of polarized beam has been stored at 670 MeV. There was no evidence of depolarization during a beam storage time of one hour. A prototype of a fast spin flipper, to achieve polarization reversal of the stored beam, was tested, with about ...