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Fixed Target @ RHIC

The use of fixed internal targets at the RHIC opens up a new energy regime, providing exciting potential to explore strongly interacting matter under extreme conditions. Notably, the QCD phase diagram reveals intriguing features in the 10-100 GeV range, where beam collisions of 20-30 GeV could achieve some of the highest baryon densities. Recent promising data from the SPS highlights the relevance of this pursuit, as a new RHIC-level machine is being developed in Europe, driven by the physics opportunities presented by this innovative approach.

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Fixed Target @ RHIC

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  1. Fixed Target @ RHIC • Using internal targets, a whole new energy regime is opened up. Enormous potential exists to expand RHIC’s coverage of strongly- interacting matter under extreme conditions. • Good reason to believe the QCD phase diagram has interesting features in the region probed by 10-100 GeV beams on fixed targets • Good reason to think that high(est??) baryon densities are created in collisions of beams around 20-30 GeV on fixed targets G.S.F.Stephans BNL Nuclear Physics Town Meeting

  2. RHIC SPS AGS Additional Motivation • Recent intriguing SPS data from NA49 G.S.F.Stephans BNL Nuclear Physics Town Meeting

  3. RHIC Beam Regions Here there be dragons RHIC BEAM Fixed RHIC BEAM Colliding G.S.F.Stephans BNL Nuclear Physics Town Meeting

  4. Some Details & Closing Thoughts • Effective beam current is frighteningly high • 0.7´109 ions/bunch Þ »3´1015 ions/second! • Target options: gas jet or (maybe) atomic beam • Most of physics can be done with few events • Beam loss cross sections are comparable to nuclear interaction cross sections • Europeans are building a RHIC-level machine partly justified by interest in this physics • Enormous potential exists to expand the RHIC program into a whole new regime G.S.F.Stephans BNL Nuclear Physics Town Meeting

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