An upgrade now in progress at the National Superconducting Cyclotron Laboratory (NSCL) facility will couple two existing superconducting cyclotrons. This will provide significant beam intensity gains for all ions and for heavier ions, also increased energy. These gains will greatly enhance the performance of the NSCL facility, particularly for nuclear studies with radioactive beams and nuclear reaction physics. A significant element of this upgrade is the K500-to-K1200 coupling line used to transport beam between the two cyclotrons. Beyond satisfying the geometric constraints of beam transport, the system must match the six-dimensional phase space obtained from the K500 to that required for injection into the K1200. The transported beams range from low energy, heavy ions like /sup 238/U/sup 28+/ at 6.9 MeV/u to high energy, light ions like /sup 16/O/sup 3+/ at 16.7 MeV/u. Tracking studies have been done to simulate the required matching conditions and performance of the coupling line. The result of these studies, including required magnets and beam diagnostics are presented in this paper.

The K1200 cyclotron at NSCL normally operates with a broad phase beam in order to achieve the highest possible intensity for production of secondary radioactive beams. Achieved extraction efficiencies of 30 to; 70% are considerably lower than the 90% level assumed in performance estimates for the Coupled Cyclotron Project (CCP) - this paper reports results of an extensive set of numerical studies of factors determining the efficiency of such a multi-turn system. The results indicate coherent and incoherent axial and radial amplitudes to be dominant factors effecting the efficiency whereas the phase width of the rf group and the voltage stability of the rf system have surprisingly little effect. Septum thickness and septum shape are important factors but behave largely as expected on the basis of straightforward geometrical considerations.

This paper reviews a study of a compact superconducting cyclotron to accelerate 200 microamps of protons to 250 MeV. The basic cyclotron structure is the same as that developed in a previous study of a 250 MeV cancer therapy cyclotron, the chief difference in the study reported here being much higher beam current (x10,000) than in the therapy cyclotron to meet desired specifications for the `Driver' accelerator of an ISOL type radioactive beam facility. The increase in current is far below (x1/50) the axial space charge limit of the proposed cyclotron, but longitudinal space charge requires changing the extraction system from a single turn to a multi-turn system thereby increasing beam losses. Leading design uncertainties, namely the overall efficiency of the multi-turn extraction system and the distribution of radioactivity generated by lost beam are addressed herein; results indicate reasonable residual activity in the cyclotron from the perspective of customary `hands-on' maintenance operations

We describe in this paper the design of a separated sector cyclotron (SSC) for the production of an intense beam of 230 MeV protons. The goal was an accelerator that could be used as the driver of an ISOL type radioactive ion beam facility.

A high rigidity, large acceptance fragment separator, the A1900, is being built at the NSCL. The device consists of twenty-four quadrupoles, four dipoles, sixteen sextupoles and sixteen octupoles. There are five sizes of the quadrupoles, three of which will contain sets of nested multipoles. The quadrupoles and the dipoles are superferric, with maximum pole tip fields of 2.5 T and 2 T, respectively. The quadrupole coils and the multipoles are random wound, potted using conductor from 0.85 to 1.35 mm in diameter. The dipole is layer wound with insulated conductor with a cross section of one by two mm. All coils are self protecting in case of a quench.

The authors report on three medical accelerator projects at Michigan State University. One involves construction of a 100-MeV superconducting cyclotron for neutron therapy. In the second, a conceptual design has been prepared for a 250-MeV superconducting synchrocyclotron for proton therapy. The third consists of preliminary studies of a compact 1600-MeV superconducting cyclotron system for heavy ion therapy

A compact superconducting cyclotron is being constructed for use as a neutron based cancer therapy facility in a major Detroit hospital . The project involves a number of novel design solutions which are described in the paper.