Storage-ring systematic errors at the proton EDM sensitivity goal · revision history

Revision 2

Accepted · core change · record

Changes against revision 1:

Title
Storage-ring systematic errors at the proton EDM sensitivity goal
Plain
A proton electric dipole moment would slowly tilt the spins of stored protons; stray fields and ring misalignments tilt them too, and must be suppressed below the tiny expected signal.
Precise · changed · core
Revision 1: In a frozen-spin all-electric ring for protons at the magic momentum $0.7007\,\mathrm{GeV}/c$, an EDM d rotates the spin vertically, with target sensitivity $d \sim 1e-29\,e\,\mathrm{cm}$. Determine whether counter-rotating beams and field reversals suppress spurious vertical spin rotation from radial magnetic fields, geometric phases of misaligned elements and vertical velocity to below the EDM signal at achievable alignment tolerances, with spin coherence time above $1e3\,\mathrm{s}$.
Revision 2: In a frozen-spin all-electric ring for protons at the magic momentum $0.7007\,\mathrm{GeV}/c$, an EDM d rotates the spin vertically, with target sensitivity $d \sim 10^{-29}\,e\,\mathrm{cm}$. Determine whether counter-rotating beams and field reversals suppress spurious vertical spin rotation from radial magnetic fields, geometric phases of misaligned elements and vertical velocity to below the EDM signal at achievable alignment tolerances, with spin coherence time above $10^{3}\,\mathrm{s}$.
Settled by
Spin-tracking simulations with realistic error spectra plus a prototype-ring measurement of the residual false signal.
Kind
well-posed
Answer type
yes-no
References
(empty)
Literature status
open
Status note
(empty)
Posed since
(empty)

Decisions