[en] The AGS at Brookhaven National Laboratory is now being prepared to accelerate heavy ions up to mass 32 to energies of approx. 15 GeV/A. Negative ions are to be made in a sputter ion source, accelerated in the BNL tandems to energies of approx. 7 MeV/A, stripped of all electrons, and transported the 2100' to the AGS. Some considerations for the injection and acceleration of Tandem beams directly into the AGS are described as are future plans for the acceleration of heavier mass ions in the AGS and ultimately the acceleration of ions in a two ring collider (RHIC) to 100 GeV/A. The physics programs for which these accelerators are designed are briefly discussed. 19 references, 4 figures, 3 tables

[en] A design has been realized for the injection of heavy ion beams generated by the BNL 3-stage tandem facility into a proposed isochronous cyclotron. The tandem beams are bunched into +- 1⁰ R.F. phase (less than or equal to 0.5 nsec) in two stages. The beam is then injected into the cyclotron through a valley, past a hill, and into the next valley on to a stripper foil. Only a single steerer is required to make trajectory corrections for the different beams. Two achromats are used to regulate the tandem potential and to provide phase control. A final section of the injection optics provides matching of transverse phase space to the acceptance of the cyclotron. The calculations use realistic tandem emittances and magnetic fields for the cyclotron based on measurements with a model magnet

[en] The scientific foundation for RHIC is of course intimately connected with the ideas of a possible phase transition from the confined hadronic state of quark matter, to a state where quarks (and gluons) can move freely over distances many (several) times the nucleonic diameter (quark-gluon plasma). An important part of the rationale for the choice of energy of RHIC, relies on the idea of transparency developing from full ''stopping'' with increasing bombarding energy. It is also important that energy densities of may times that of the ground state of cold nuclear matter can be reached in ion-ion collisions. In this talk, we will examine whether the two latter premises seem to hold true in view of the data from A+A collisions at the brookhaven AGS-Tandem Complex and at the CERN-SPS. Finally, a few comments are made on measured slopes of hadronic p/perpendicular/ spectra. 18 refs., 2 figs., 1 tab

[en] An earlier work on oxygen-16 reactions with nickel at 96 MeV is extended in order to investigate the extent to which two-body kinematics reproduce that process and to assess the possible role of light contaminants in the target for producing an apparent deep inelastic peak. Various mass spectra and differential cross sections are shown and discussed

[en] Differences are investigated in pion source sizes derived using π⁺π⁺ and π^-π^- pairs in the large statistics data set collected with the E866 Forward Spectrometer for central Au+Au collisions at 11.6 A. · GeV/c in AGS Experiment E866. These differences in source radii are interpreted using a simple classical description for the Coulomb and the transverse-momentum (p_T) dependent source radius parameters. An estimated effective net charge responsible for the distortion is considerably smaller than the expected total projectile participant protons, which suggests that the system undergoes a rapid expansion in the longitudinal direction before freezeout. This picture is consistent with the results derived from the π^-/π⁺ singles yield ratios for the same reactions

[en] A new design has been developed for shaping pole tips to produce the radially increasing fields required for isochronous cyclotrons. The conventional solid hill poles are replaced by poles mounted over a small secondary gap which tapers radially from maximum at the magnet edge to zero near the center. Field measurements with a model magnet and calculations with the code TRIM show an increase in field at the edge of the magnet without the usual corresponding large increase in fringing, and a radial field shape more nearly field independent than for conventional hills. The flying hills have several advantages for variable energy multiparticle cyclotrons: (1) a large reduction in the power dissipated by isochronizing trim coils; (2) a more constant shape and magnitude flutter factor, eliminating flutter coils and increasing the operating range; and (3) a sharper fall-off of the fringe field, simplifying beam extraction

[en] Brookhaven E-802 is a magnetic spectrometer experiment which is directed towards the measurement of particle momentum spectra and particle-particle correlations following reactions with 14.5 GeV/u O and Si ions. In addition to the spectrometer there are detectors to measure the transverse energy flow, longitudinal energy flow, and the multiplicity. These detectors can be used to characterize the particle spectra or correlated between themselves. Particle spectra have been obtained for protons, pions, and kaons using targets of gold, copper, and aluminium although the data are not entirely analyzed as yet. A first result that is of great interest is the K⁺/π⁺ ratio for Si + Au reactions which is larger than expected on the basis of the known p+p data

[en] Beam-orbit studies were performed for the conversion of the SREL synchrocyclotron magnet for use as a room temperature, multiparticle, isochronous cyclotron. Based on model magnet measurements of field profiles for 8 to 23⁰K gauss hill fields, a four sector spiral pole tip design has been realized which allows all isotope species of heavy ion beams to be accelerated to required final energies. The total spiral angle of 38⁰ allows injection of the beams from the MP tandem into the cyclotron through a valley. The two valey RF system of 140 kV peak accelerates beams on harmonic numbers 2, 3, 4, 6 and 10 at 14 to 21 MHz. Computer calculations indicated acceptable ν/sub z/, ν/sub r/ and phase space beam characteristics and passing of resonances for typical beams considered: ¹⁶O at 8 and 150 MeV/amu, ⁶⁰Ni at 100 MeV/amu and ²³⁸U at 2.5 and 16 MeV/amu. Single turn extraction is achieved with electrostatic deflection

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