Feasibility of Reusing PEP-II Hardware for MEIC Electron Ring

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Presentation transcript:

Feasibility of Reusing PEP-II Hardware for MEIC Electron Ring Fanglei Lin, Andrew Hutton, Leigh Harwood, Vasiliy Morozov, Fulvia, Pilat, Yuhong Zhang F. Lin

FODO Arc Cell Aperture radius 45 mm Dipoles Quadrupoles   Magnetic/physical length 5.4/5.68 m Bending angle 40.9 mrad (2.34), bending radius 132 m 0.31 T @ 12 GeV, 0.13 T @ 5 GeV Sagitta 2.8 cm Quadrupoles Magnetic/physical length 0.7185/0.7785 m -11 and 14 T/m field gradients @ 12 GeV for 135/90 x/y betatron phase advance 0.63 T @ 45 mm radius Sextupoles Magnetic/physical length 0.25/0.31 m -172 and 94 T/m2 field gradients @ 12 GeV 0.17 and 0.09 T @ 45 mm radius BPMs and Correctors Each one physical length 0.15 m Complete FODO Length 15.2 m Arc bending radius 186 m optimal curvature  

TME-like Arc Cell Aperture radius 45 mm Dipoles Quadrupoles Sextupoles Magnetic/physical length 5.4/5.68 m Bending angle 55.9 mrad (3.2), bending radius 96.5 m 0.42 T @ 12 GeV, 0.17 T @ 5 GeV Sagitta 3.8 cm Quadrupoles Magnetic/physical length 0.9/0.96 and 0.7185/0.7785 m 19.2, -18.7 and 17.8 T/m field gradients @ 12 GeV for 270 and 90 x/y betatron phase advance 0.87, -0.84 and 0.80 T @ 45 mm radius Sextupoles Magnetic/physical length 0.25/0.31 m -381 and 361 T/m2 field gradients @ 12 GeV/c 0.39 and 0.37 T @ 45 mm radius BPMs and Correctors Each one physical length 0.15 m Complete FODO Length 20.444 m Arc bending radius 183 m

PEP-II HER vs. MEIC Arc Cell Parameters Unit PEP-II HER FODO cell MEIC FODO cell (135/90 pha. adv. ) MEIC FODO cell (90 pha. adv. ) MEIC TME-like cell (1.5/0.5 pha. adv.) Energy GeV 9 12 Dipole physical length m 5.68 Bending angle deg 1.875 2.34 3.205 Bending radius 165.0 132 96.5 Magnetic field T 0.1819 0.3030 0.4147 Sagitta R cm 2.2 2.8 3.8 Quad physical length 0.7185* 0.7785/0.7785 0.96/0.7785/0.7785 Field gradient T/m 5.48* 14/11 10.7/10.6 19/19/18 Cell length 15.2 20.444 Number of cells 96 104 76 Number of dipoles 192 208 152 Number of quads 192 (?) 104/104 76/152/152 Norm. emittance um 845 513 (+ 547*) 1175 (+ 547) 94 (+ 547) SR power density total power kW/m 10 MW 10.4 * 0.7185 m is the magnetic length shown in the conceptual design report. It has 70 quadrupole magnets of this type. * 547 um is the contribution of emittance from the spin rotators and interaction regions at 12 GeV. This can be further optimized.

PEP-II HER vs. MEIC Arc Cell Parameters Unit PEP-II HER FODO cell MEIC FODO cell (135/90 pha. adv. ) MEIC FODO cell (90 pha. adv. ) MEIC TME-like cell (1.5/0.5 pha. adv.) Energy GeV 9 12 Dipole physical length m 5.68 Bending angle deg 1.875 2.34 3.205 Sagitta R cm 2.2 2.8 3.8 Quad physical length 0.7185* 0.7785/0.7785 0.96/0.7785/0.7785 Field gradient T/m 5.48* 14/11 10.7/10.6 19/19/18 Cell length 15.2 20.444 Norm. emittance um 845 555 (+ 547*) 1175 (+ 547) 94 (+ 547) Hor. Max. beam size with *=(10,2)cm mm 4.3 5.4 3.3 Hor. Max. beam size with *=(40,8)cm 2.7 1.6 Such large beam demands large dynamic aperture. This is the beam size at 12 GeV. Beam size will be double at 20 GeV ! Luminosity reduces by a factor of 4

Thank You for Your Attention !

MEIC e-ring Geometry e- Whole ring 2510.6 m Each arc 879.9 m Each straight 375.3 m Each arc 879.9 m Whole ring 2510.6 m