Prospects for physics at e/sup +/e/sup -/ linear colliders Page: 4 of 72
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e Targe!
e" e r - -, e-
Linac Linac e Linoc Q LinaC Linac
Experimental
Bdls Area e" Damping
6 Ca Ring Ring
Fig. 1. Schematic of a generic linear collider.
the emittance of the beams, although in some designs the electron damping
ring may not be necessary.
Figure 2 shows the only present example of a linear collider, the SLC. Please
note that this design is topologically equivalent to the generic linear collider
with the present SLAC linac serving as all three required linacs. A positron
return line and two arcs have been added to transport the particles to the
required locations; in principle, these transport lines do not Oect the basic
functioning of the collider.
I will not say anything about the SLC in these lectures except to use it as a
comparison to the designs for very high-energy colliders. There are two design
exercises we can look at: the Cern Linear Collider (CLIC), a 2 TeV collider
being designed at CERN,3 and the TeV Linear Collider (TLCI.' Table 2 lists
some basic parameters of the SLC' and these two designs. All three use a
conventional travelling wave rf structure for the main accelerator, but differ
on the source of rf power. SIC uses conventional klystrons; the CLIC design
uses a superconducting drive linac in which a low-energy, high-current electron
beam transmits energy to the main linac; and the TLC design envisions using
a relativistic klystron in which the low-energy beam is driven by magnetic
induction.
The accelerator gradients are considerably higher in the high-energy collid-
ers in order to keep the length reasonable. The TLC design at 196 MV/rm is4
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Feldman, G. J. Prospects for physics at e/sup +/e/sup -/ linear colliders, article, March 1, 1988; Menlo Park, California. (https://digital.library.unt.edu/ark:/67531/metadc1055865/m1/4/: accessed May 30, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.