Accelerator physics in RHIC (Relativistic Heavy Ion Collider)
RHIC (for Relativistic Heavy Ion Collider) is a colliding beam facility to be built at BNL in the tunnel system that was constructed for the defunct ISABELLE/CBA project. It is intended for the study of collisions between fully stripped ions of the same or different species with magnetic rigidities of up to at least 839.5 Tm, corresponding with an energy of 100 GeV/amu (amu for atomic mass unit) for particles with A/Z = 2.5, and 251 GeV for protons. There are six potential crossing regions, each with, initially, time average luminosities of up to a few times 10/sup 26/ cm/sup -2/ sec/sup -1/ for Au, with luminosity life-times of 10 hours for Au, and longer for the lighter ions. The initial proton-proton luminosity will be about 10/sup 31/ cm/sup -2/ sec/sup -1/. The rms length of the interaction diamond is 0.2 m when the beams collide colinearly, it is determined by the lengths of the colliding bunches. The diamond length can be reduced by having the beams cross at an angle, but this reduces the luminosity. The magnitude of the crossing angle is restricted geometrically in dependence of the energies and species of the interacting ions and possibly also by dynamic effects in the circulating beams. The distance between each crossing point and the nearest machine component is 9 m on each side, this space is available for experimental equipment. The performance quoted assumes that each ring contains 57 bunches, each bunch with 10/sup 9/ Au ions, resp 10/sup 11/ protons and with invariant emittances of 10..pi.., resp 20..pi.. mm-mrad, and ..beta../sub x/* = ..beta../sub y/* = 3 m. The beam-beam tune-shift per crossing point at these intensities is 0.0025, resp 0.0037. 5 refs., 4 figs.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 6610185
- Report Number(s):
- BNL-42089; CONF-8806243-7; ON: DE89004514
- Resource Relation:
- Conference: DPF summer study: Snowmass '88 on high energy physics in the 1990s, Snowmass, CO, USA, 27 Jun 1988; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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