LATTICE QCD ON SMALL COMPUTERS

We demonstrate that lattice QCD calculations can be made 10(3)-10(6) t imes faster by using very coarse lattices. To obtain accurate results, we replace the standard lattice actions by perturbatively-improved ac tions with tadpole-improved correction terms that remove the leading e rrors due to the lattice. To illustrate the power of this approach, we calculate the static-quark potential, and the charmonium spectrum and wavefunctions using a desktop computer. We obtain accurate results th at are independent of the lattice spacing and agree well with experime nt.