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The High Intensity Gamma-ray Source (HIGS) at Duke University is anaccelerator-driven Compton gamma-ray source, providing high flux gamma-ray beamfrom 1 MeV to 100 MeV for photo-nuclear physics research. The HIGS facilityoperates three accelerators, a linac pre-injector (0.16 GeV), a boosterinjector (0.16-1.2 GeV), and an electron storage ring (0.24-1.2 GeV). Becauseof proximity of the booster injector to the storage ring, the magnetic field ofthe booster dipoles close to the ring can significantly alter the closed orbitin the storage ring being operated in the low energy region. This type of orbitdistortion can be a problem for certain precision experiments which demand ahigh degree of the energy consistency of the gamma-ray beam. This energyconsistency can be achieved by maintaining consistent aiming of the gamma-raybeam, therefore, a steady electron beam orbit and angle at the Comptoncollision point. To overcome the booster leakage field problem, we havedeveloped an orbit compensation scheme. This scheme is developed using two fastorbit correctors and implemented as a feedforward which is operatedtransparently together with the slow orbit feedback system. In this paper, wewill describe the development of this leakage field compensation scheme, andreport the measurement results which have demonstrated the effectiveness of thescheme.

Compensation for Booster Leakage Field in the Duke Storage Ring