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Based on the notion that the local dark-matter field of axions or axion-likeparticles (ALPs) in our Galaxy induces oscillating couplings to the spins ofnucleons and nuclei (via the electric dipole moment of the latter and/or theparamagnetic axion-wind effect), we establish the feasibility of a new methodto search for ALPs in storage rings. Based on previous work that allows us tomaintain the in-plane polarization of a stored deuteron beam for a few hundredseconds, we performed a first proof-of-principle experiment at the CoolerSynchrotron COSY to scan momenta near 970 MeV/c. This entailed a scan of thespin precession frequency. At resonance between the spin precession frequencyof deuterons and the ALP-induced EDM oscillation frequency there will be anaccumulation of the polarization component out of the ring plane. Since theaxion frequency is unknown, the momentum of the beam and consequently the spinprecession frequency were ramped to search for a vertical polarization changethat would occur when the resonance is crossed. At COSY, four beam bunches withdifferent polarization directions were used to make sure that no resonance wasmissed because of the unknown relative phase between the polarizationprecession and the axion/ALP field. A frequency window of 1.5-kHz width aroundthe spin precession frequency of 121 kHz was scanned. We describe theexperimental procedure and a test of the methodology with the help of aradiofrequency Wien filter located on the COSY ring. No ALP resonance wasobserved. As a consequence an upper limit of the oscillating EDM component ofthe deuteron as well as its axion coupling constants are provided.

First Search for Axion-Like Particles in a Storage Ring Using a Polarized Deuteron Beam