Author: Kireeff Covo, M.
Paper Title Page
MO2PB02 High Current Beam Extraction from the 88-Inch Cyclotron at LBNL 19
  • D.S. Todd, J.Y. Benitez, K.Y. Franzen, M. Kireeff Covo, C.M. Lyneis, L. Phair, P. Pipersky, M.M. Strohmeier
    LBNL, Berkeley, California, USA
  The low energy beam transport system and the inflector of the 88-Inch Cyclotron have been improved to provide more intense heavy-ion beams, especially for experiments requiring 48Ca beams. In addition to a new spiral inflector* and increased injection voltage, the injection line beam transport and beam orbit dynamics in the cyclotron have been analyzed, new diagnostics have been developed, and extensive measurements have been performed to improve the transmission efficiency. By coupling diagnostics, such as emittance scanners in the injection line and a radially-adjustable beam viewing scintillator within the cyclotron, with computer simulation we have been able to identify loss mechanisms. The diagnostics used and their findings will be presented. We will discuss the solutions we have employed to address losses, such as changing our approach to tuning VENUS and running the cyclotron's central trim coil asymmetrically.
*Ken Yoshiki Franzen, et al. "A center region upgrade of the LBNL 88-Inch Cyclotron", these proceedings
slides icon Slides MO2PB02 [0.824 MB]  
TUPSH016 Trim Coil Unbalance of the 88-Inch Cyclotron 254
  • M. Kireeff Covo, B. Bingham, C.M. Lyneis, B. Ninemire, L. Phair, P. Pipersky, A. Ratti, M.M. Strohmeier, D.S. Todd
    LBNL, Berkeley, California, USA
  • K.Y. Franzen
    Mevion, Littleton, Massachusetts, USA
  Funding: Work supported by the Director, Office of Energy Research, Office of High Energy and Nuclear Physics, Nuclear Physics Division of the U.S. Department of Energy under Contract DE-AC02-05CH11231.
The 88-inch cyclotron Dee probe shows large losses inside the radius of 20 cm and suggests problems in the ion beam injection. The current of the top and bottom innermost trim coil 1 is unbalanced to study effects of the axial injection displacement. A new beam profile monitor images the ion beam bunches, turn by turn, and the beam center of mass position is measured. The technique allows increasing the beam transmission through the cyclotron.