SPEAR, a storage ring 80 meters in
diameter now used as the synchrotron radiation source for
SSRL.
PEP, a 30 GeV colliding-beam storage ring, 800
meters in diameter, now being upgraded to PEP-II, which will serve as
a B meson
factory, colliding 9 GeV electrons with 3.1 GeV positrons.
SLC, a 100 GeV electron-positron linear collider,
and SLD, the
collider detector.