known then, produced its first accelerated beam--512 GeV--on July 3, 1983.

Its initial energy of 800 GeV was achieved on February 16, 1984. On October 21, 1986, acceleration at the Tevatron was pushed to 900 GeV, providing a first proton-antiproton collision at 1.8 TeV on November 30, 1986.

The Main Injector, which replaced the Main Ring, was the most substantial addition, built over six years from 1993 at a cost of $290 million. Tevatron collider Run II begun on March 1, 2001, after successful completion of that

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