The MEIC electron ring as the large ion booster

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Presentation transcript:

The MEIC electron ring as the large ion booster /An old proposition/ Y. Derbenev MEIC R&D meeting, 08.28.2014

Prerequisites Two beams/rings about same energy range: 3 to 10-12 Gev of e-beam in storage ring vs 3 to 20-25 GeV of protons of Large Booster Low field warm magnets for e-beam: MEIC e-ring on PEP-II dipoles (F. Lin): 0.15 T at 5 GeV (0.1 T at 3 GeV)⟶0.65 T at 25 GeV of p Two beams could share magnets and chamber in arcs while be separated in fig.8 straights: - First, transport/stack the ion beam to the ion collider ring - Then inject e-beam from CEBAF to the ring and run the collider

PEP-II HER vs. MEIC Arc Cell Parameters Unit PEP-II HER MEIC TME-like cell (1.5/0.5 pha. adv.) Energy GeV 9 12 5 Dipole mag. (phys.) Length m 5.4 5.4 (5.68) Bending angle deg 1.875 2.8125 Bending radius 165.0 110.0 Magnetic field T 0.1819 0.3639 0.1516 Quad physical length 0.7185 0.76/0.66/0.66 Field gradient T/m 5.48 27/28/27 11/12/11 Cell length 15.2 18.36 Number of cell 16*6 96 Number of dipoles 192 Arc length 1459.2 1758.76 Straight length 751.815134 Circumference 2199.32 2510.575134 Nor. emittance um 845 82 (+ 547) 6 (+ 40) SR power density total power kW/m 3.1 (11.31) 2.2 (7.87) MW 2.9 (5.49) 2.0 (3.82) Sagitta R cm 2.2 3.3 * 40 and 547 um are the contribution of emittance from spin rotator and IR at 5 and 12 GeV, respectively.

Issues Quads: need new design/enhancement/construction? Fast ramp of PEP II magnets: what the additions does it take? (pulse power, etc.) Finally, is this suggestion sensible and consistent enough to deserve further investigation? – in the view of the overall ongoing explorations of the cost/efficiency optimization.