DESIGN CONSIDERATIONS AND EXPECTATIONS OF A VERY LARGE HADRON COLLIDER Page: 1 of 4
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Design Considerations and Expectations of a Very Large Hadron Collider *
Alessandro G. Ruggiero
Brookhaven National Laboratory
Upton, New York
The ELOISATRON Project is a proton-proton collider at very high energy and very large lumi-
nosity. The main goal is to determine the ultimate performance that is possible to achieve with
reasonable extrapolation of the present accelerator technology. A complete study and design of
the collider requires that several steps of investigations are undertaken. We count five of such
steps as outlined below.
The performance limitation of a large hadron collider is determined by the superconducting
magnet technology, and by the beam dynamics, both which may lead to a very large circumfer-
ence of the collider. The first step of the investigation deals indeed with these two most outstand-
ing issues of the project: the large size of the collider, which beyond a certain limit may be
unmanageable for a variety of technical and economical considerations, and the strength of the
superconducting magnets which needs to be achieved and demonstrated. These two issues are of
course related to each other since beam momentum p, bending radius p and magnetic field B are
bound together by the well-known relation
B (Tesla) p (meter) = 3.3356 p (GeV/c) (1)
After these three major parameters, beam energy, magnetic field and the size of the collider,
have been selected, the ELOISATRON Project will have to deal with another group of consider-
ations during the second step of the study. They include: optimal design of the collider layout and,
in particular, the design of the interaction region. The ELOISATRON is conceived as a classical
circular collider. It is unfortunate that its size is required mostly to carry the proton beams around,
circulating in opposite directions, so that they may collide in few, relatively short regions where
the collider detectors are located and the experimental program is carried out. The design of the
interaction region will interface with the overall collider outline at one end, and with the detector
occupancy on the other. Requirements may be very stringent, especially concerning the collider
luminosity which is the main parameter used by the users to evaluate the performance. For
instance, the following criterion may be adopted. The reference design of the SSC, the large USA
proton-proton collider now discontinued, called for a luminosity of 1033 cm-2 s-1 at the beam
energy of 20 TeV. It is estimated that the required luminosity scales quadratically with the beam
energy to compensate for the loss of the cross-section of the special events that one wants to
detect. Thus, we may require the following behavior of the luminosity L with the beam energy E
L = ( 1033 cm 2s-1 ) (E/ 20 TeV )2 (2)
On top of this, it is also desirable that a large size project like the ELOISATRON has the concep-
tually demonstrated capability of increasing in a second phase the performance of the collider by
*Work performed under the auspices of the U.S. Department of Energy
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RUGGIERO,A.G. DESIGN CONSIDERATIONS AND EXPECTATIONS OF A VERY LARGE HADRON COLLIDER, article, November 4, 1996; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc703237/m1/1/: accessed February 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.