BNL SUPERCONDUCTING STORAGE RING MAGNET UPDATE

This report updates the various performance data, design and specifications for the storage ring and experimental series dipole and quadrupole magnets as well as the working line and correction coil systems. The working line system includes the closed orbit dipoles, the quadrupole trim, sextupoles, octapoles, decapoles and duodecapoles. These are the magnets in the standard subunits of the Brookhaven National Laboratory Intersecting Storage Ring Accelerator “ISABELLE”. There have been 14 full size single layer dipole prototypes 4.25 to 4.75 m long constructed. There have been two 1.5 m long full size quadrupoles built. A one meter double layer dipole was built in order to obtain high field = 6.0 T data. A subunit of the original 200 X 200 GeV version of the ISABELLE lattice was assembled to study systems operation. (ISABELLE now has the design goal of 400 X 400 GeV.1) This subunit utilized the proposed ISABELLE form of refrigeration, namely “high pressure helium gas forced flow”. The array composed of two dipoles and a quadrupole with auxiliary working line and correction coil systems was serially connected both electrically and cryogenically. One of the major design goals, that of the magnets being protected by the ability to absorb their own energy, proved to be attainable. This is accomplished without external intervention, i.e. external extraction or driving the magnets normal by an active external circuit. This simply means the magnets L/R time constants during a quench are short enough to prevent thermal damage or run away. There are two series of prototypes. The first one is the so-called “standard” which will become the ring magnets for “ISABELLE” when the machine design is frozen. The second is that in which various characteristics and/or limits of various parameters are explored. Various parameters such as maximum ramp rate and other & dependent phenomena are bracketed even though the present standard parameters are workable. There has also been obtained in the last two years operational data on four large (25 cm cold aperture, 2.5 m long) pool boiling dipoles. They have been an integral part of the High Energy Unseparated Beam guiding particles to the MPS (multiparticle spectrometer) of the AGS (30 GeV alternating gradient synchrotron, ISABELLE1s injector). © 1979 IEEE