[Paper Review] Comprehensive Symmetric-Hybrid ring design for pEDM experiment at below $10^{-29}e\cdot$cm

Zhanibek Omarov, Hooman Davoudiasl+7 more|arXiv (Cornell University)|Jul 20, 2020

Dark Matter and Cosmic Phenomena44 references5 citations

TL;DR

This paper presents a comprehensive symmetric-hybrid ring design for a proton electric dipole moment (pEDM) experiment aiming to probe EDMs below 10⁻²⁹ e·cm. By optimizing lattice design, minimizing background electric fields, and controlling geometric phase and relativistic effects, the authors demonstrate that systematic errors are suppressed by orders of magnitude, making the experiment feasible with current technology.

ABSTRACT

A concise demonstrative summary of the Symmetric Hybrid ring design for the storage ring proton electric dipole moment experiment is presented. Critical issues such as lattice design, background electrical fields,geometrical phase, general relativity, spin coherence time and polarimeter systematics are presented. Overall, we find that with the currently proposed design iteration, systematic error sources are reduced by orders of magnitude and that the ring alignment requirements are within the currently available technology.

Motivation & Objective

• To design a storage ring capable of probing proton electric dipole moments below 10⁻²⁹ e·cm.
• To minimize systematic errors from background electric fields, geometric phase, and relativistic effects.
• To ensure ring alignment and field control are achievable with current technology.
• To enable high-precision spin and beam dynamics measurements critical for EDM sensitivity.
• To provide a robust framework for next-generation EDM experiments in storage rings.

Proposed method

• Designs a symmetric-hybrid ring lattice to balance spin precession and beam stability.
• Employs precise control of magnetic and electric fields to suppress systematic errors.
• Applies corrections for geometric phase and general relativistic effects on spin dynamics.
• Uses spin coherence time analysis to assess experimental sensitivity limits.
• Incorporates polarimeter systematics modeling to minimize measurement bias.
• Validates the design against known constraints from quantum field theory and QCD.

Experimental results

Research questions

• RQ1 Can a storage ring design achieve systematic error suppression below 10⁻²⁹ e·cm for pEDM?
• RQ2 How do geometric phase and general relativity affect spin precession in a high-precision EDM ring?
• RQ3 To what extent can background electric fields be minimized in a symmetric-hybrid lattice?
• RQ4 What are the practical alignment and field control requirements for such a ring?
• RQ5 Can current technology meet the stringent precision demands of a sub-10⁻²⁹ e·cm pEDM experiment?

Key findings

• Systematic error sources in the proposed symmetric-hybrid ring design are reduced by orders of magnitude compared to previous designs.
• The ring alignment and field control requirements are within the capabilities of current experimental technology.
• Background electric fields are suppressed through optimized lattice symmetry and field-shaping techniques.
• Geometric phase and general relativistic effects are analytically modeled and shown to be controllable within required tolerances.
• Spin coherence time is preserved at levels sufficient to achieve sensitivity below 10⁻²⁹ e·cm.
• The design demonstrates feasibility for probing new physics beyond the Standard Model, including the strong CP problem and axion-like particles.