[en] The NSCL K1200 cyclotron operates with partially overlapping turns at the extraction septum and beam loss of about 50 % at extraction. We have improved the deflector's power dissipation and mechanical accuracy in pursuit of higher intensity for deflector-limited beams. The radial and vertical dimensions of the deflector are unusually compact to fit within the superconducting magnet. Improvements include adding water cooling to all segments (deflector is hinged), indirect cathode cooling via beryllium oxide support insulators, septum support and alignment and use of a leading edge notch to increase the radiating area. Experiments with a pyrolytic graphite septum show better power dissipation performance than with a tungsten septum, but with the maximum voltage somewhat reduced. (authors)

[en] A septum of improved design has replaced the standard tungsten septum with uniform thickness used in the deflector for the K1200 cyclotron at Michigan State University. A V-notch in the leading edge enhanced radiation cooling, and an increased septum thickness away from the median plane enhanced conduction of heat to the water cooled housing. Previously observed degradation of beam transmission attributed to thermally induced deformation of the septum was greatly improved with the new septum. The demonstrated power dissipation with an Ar beam was 900 W

[en] the Coupled Cyclotron Facility at Michigan State University was completed in July 2001. It has produced dozens of secondary beam species for the users performing experiments, from about 14 primary beams (O to Bi) with energy in the range 80 to 160 MeV/u. To enhance the yield of rare isotopes, the primary beam is generally a separated isotope with either the largest or the smallest neutron excess available. The facility has two ECR ion sources, feeding two superconducting cyclotrons in tandem, followed by the secondary beam production target and the A1900 fragment separator. The ongoing effort to understand the beam formation process with space charge effects and improve the matching of the ion source output to the first cyclotron is expected to increase the beam output of the facility. (author)

[en] The Coupled Cyclotron Facility at Michigan State University is being completed with the experimental program scheduled to start in July 2001. Beam from either the recently completed room temperature ECR or from the existing superconducting ECR is injected axially into the refurbished K500 cyclotron, sent to the K1200 cyclotron via a new beam line along the median plane and stripped by a carbon foil located inside a dee for injection. First beam through the paired cyclotrons was obtained on 10 October 2000

[en] The NSCL has embarked on the upgrade of its facilities to increase the intensity of the primary beams, mainly to increase the rates of the radioactive secondary beams produced by the projectile fragmentation method. The extracted beam power is expected to reach 4 kW. This level of power in heavy ion beams is difficult to handle because of the short range of the ions. Compact superconducting cyclotrons have inherent size constraints that make it more difficult to deal with beam losses and power dissipation. Short beam bunches are desirable to minimize losses at extraction, however, with intense beams the space charge forces will limit the minimum turn width. We present the results of simulations of the different areas of the upgrade: injection, acceleration and extraction in the K500 and K1200 cyclotrons, that allow us to estimate the losses expected in the entire system. (authors)