Description: While fixed-target experiments in storage rings were suggested more than twenty-five years ago, little work has been done and virtually none in this country although interest seems to be growing. We survey the advantages, limitations and possibilities. Luminosities of L approx. = 10/sup 33/cm/sup -2/s/sup -1/ for electrons up to 15 GeV should be achievable now with the PEP storage ring at SLAC with good beam lifetime and emittance for target thicknesses n/sub t/ approx. 10/sup 15//cm/sup 2/. This is thin but ideal for optically pumped, polarized gas targets. Providing longitudinally polarized beams at such targets would provide a unique facility for high luminosity polarized e/sub +-/ + polarized ..gamma.., polarized e/sub +-/ + polarized A and polarized ..gamma.. + polarized A experiments. Other possibilities include the production of both external and internal beams for basic and applied science. Multiple bypass insertions are considered for thicker targets as well as production and storage of exotic, short-lived beams or for production of photon beams with undulators. The related question of multi-turn injection and extraction is also considered in such a context. Several systematic machine physics studies are suggested, e.g., ion-induced, multi-bunch instabilities with e/sub +-/ beams. The SLAC storage ring PEP is used as an example because it is ideal for simultaneous production of internal target, external target and colliding beam luminosities. The differences between electrons and heavier particles such as protons, antiprotons or heavy ions are discussed where possible.
Date: November 1, 1986
Creator: Spencer, J.E.
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