Abstract
A new polarization control mode called a Spin Transparency (ST) mode is currently being actively developed for new rings. The ST mode is an intrinsic feature of figure-8 rings such as the JLEIC at Jefferson Lab. A racetrack collider can be converted to the ST mode by inserting two identical Siberian snakes into its opposite straights as at NICA, JINR. The ST mode allows one to develop a completely new approach to the measurement of the EDMs of both protons and deuterons. The idea of the method is to use the significant enhancement of the EDM signal by the interaction of the EDM with arc magnets, which has an interference effect. A unique feature of this technique is the conceptual capability of measuring the EDM signal in the whole energy range of a ring without introducing additional electric fields using only its magnetic fields. We describe an experimental setup and provide estimates of the limiting EDM values that can be measured at the JLEIC and NICA colliders.
Highlights
The search for the proton and deuteron electric dipole moment (EDM) has been the goal of accelerators and storage rings for the past few decades
References [3, 4] propose the use of spin rotators based on static combined electro-magnetic fields (Wien filter) for measuring the EDM of protons and deuterons
Let us emphasize that the contribution to the EDM signal from the structure depending on the spin rotation angle in the arc magnets has interference character
Summary
The search for the proton and deuteron EDMs has been the goal of accelerators and storage rings for the past few decades. The concept of “frozen spin” was proposed at the US BNL for measuring the proton EDM in a ring consisting of only electric field elements [1]. The idea of this technique is to choose the “magic” energy when there is no effect of the magnetic dipole moment on the spin. This technique is not applicable to the search of the deuteron EDM. We propose a technique to measure the proton and deuteron EDMs based on using the ring’s spin transparency mode, which does not require neither additional electric fields nor Wien filters
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