  Recent advances in superconductor properties and superconducting magnet
technology have made it possible to build cost-effective, high-performance
dipoles with a field of 12 Tesla - 3 times the field strength of the Tevatron.
Such magnets could be used to upgrade Fermilab's collider in its existing
tunnel to a collision energy $\sqrt s$= 6 TeV and luminosity {$\cal L$}$>$
10$^{33}$ cm$^{-2}$s$^{-1}$. We have calculated the parton luminosities for
quark-antiquark and gluon-gluon scattering for the Tevatron, the Tripler, and
LHC. In most models of the Higgs field and supersymmetry, the Tripler would
have a high likelihood to discover many of the predicted particle states.
