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MAGNETS FOR RHIC
E. H. Willen
Brookhaven National Laboratory
Upton, N.Y. 11973
The Relativistic Heavy Ion Collider (RHIC) is
a proposed research facility (1) at Brookhaven Na-
tional Laboratory for the study of extreme states
of matter. By colliding two beams of ions, up to
gold in mass and at energies up to 100 GeV/amu,
high energy density will be achieved within the
nuclei of the colliding ions, leading to a variety
of fundamental effects not heretofore observed.
The physics to be explored by this Collider is an
overlap between the traditional disciplines of nu-
clear physics and high energy physics. The ma-
chine is proposed for construction in the now-
empty tunnel built for the former CBA project. In
addition to the tunnel, various other facilities
needed for the machine are in place, including ex-
perimental halls, a beam transfer tunnel from the
AGS, and a 'refrigerator for providing cryogenic he-
lium. Soon to be commissioned is a beam line to
carry heavy ions from the BNL Tandem Van de Graaff
to the AGS, and a Booster (321 MeV/amu for gold)
for the capture and acceleration of the ions prior
to injection into the AGS is under construction.
Though direct injection into the AGS will be possi-
ble, the Booster is necessary to efficiently cap-
ture and accelerate the heavier ion species. The
AGS will then accelerate the ions (up to 10.7
GeV/amu for gold) prior to injection into the
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Collider. Figure 1 shows the layout of the RHIC
project on the laboratory site.
-14.811 -10 -5 0
5 10 14.811
Figure 2. RHIC Regular Arc Cell.
The Collider, including the magnets, is in an
advanced state of design. Figure 2 shows the
layout of the basic RHIC regular arc cell. Sev-
enty-two such cells are required to complete one
ring. The lattice of magnets chosen in the design
reflects the need for strong focussing to maintain
a small beam size while coping with the severe
intrabeam scattering of heavy ion beams. Each
cell is 29.622 m long; it deflects the beam by
77.7 mrad and has a betatron phase advance of 90*.
The layout of the magnets to bring the beams
into collision is shown in Fig. 3. Crossing
angles from zero to several milliradians are
allowed. Because of the need to accomodate both
a range of energies and different ion species,
from protons to gold, several special large dipole
and quadrupole magnets are required near the colli-
sion point. Otherwise, the magnets in these inter-
section regions have characteristics similar to
those in the regular arcs.
The characteristics of the dipole and
quadrupole magnets required for the arcs and for
the intersection regions are given in Table 1.
Table 2 lists the total complement of magnets
required in the machine, including the sextupole
and multipole correctors located at each of the
quadrupole magnets. Current plans are for 10-20%
of these magnets to be built at Brookhaven and the
rest to be built in industry over a 4-year con-
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H., Willen E. Magnets for RHIC, report, May 1, 1986; United States. (digital.library.unt.edu/ark:/67531/metadc870325/m1/2/: accessed December 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.