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SPEAR is filled with bunches of electrons and positrons traveling
in opposite directions around the ring. The particles circulate
in an evacuated pipe. Dipole magnets placed at regular intervals
provide the force to steer the particles around the ring. The
particles
are fed to SPEAR at the desired energy from an accelerator,
originally
the two mile SLAC linac. As the charged particles circulate they
lose energy by synchrotron radiation. This energy is
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