A compact all-electric Figure-8 spin-transparent storage ring at JLab could directly measure the electron EDM at about 5.8e-30 ecm and detect axion-induced spin precession at 0.2 nHz, if one-day spin coherence holds.
The Twisted Spin Synchrotron
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abstract
A "Figure 8" shaped synchrotron is suggested for use in accelerating polarized protons in the energy range below ~ 20 GeV. The spin tune in such an accelerator does not ramp with energy and is equal to zero . Then the intrinsic spin resonances will not appear. A partial Siberian snake (solenoid) is proposed to be inserted into the ring in order to stabilize the spin against imperfect horizontal magnetic fields and implicate a small constant spin tune. The equilibrium polarization will then be horizontal (longitudinal in the solenoid). The twisted spin synchrotron (TSS) can serve as a booster for high energy accelerators with polarized beams. Possibilities to use the TSS as a storage facility or a collider for proton or other particle beams with readily controlled beam polarization are also noted.
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High Precision Fundamental Physics Experiments at JLab with Spin-transparent Storage Rings of Low-energy Polarized Electron Beams
A compact all-electric Figure-8 spin-transparent storage ring at JLab could directly measure the electron EDM at about 5.8e-30 ecm and detect axion-induced spin precession at 0.2 nHz, if one-day spin coherence holds.