Abstract
The Jülich Electric Dipole moment Investigations (JEDI) collaboration in Julich is preparing a direct EDM measurement of protons and deuterons first at the storage ring COSY (COoler SYnchrotron) and later at a dedicated storage ring. Ensuring a precise measurement, various beam and spin manipulating effects have to be considered and investigated. A distortion of the closed orbit is one of the major sources for systematic uncertainties. Therefore misalignments of magnets and residual power supply oscillations are simulated using the MAD-X code in order to analyse their effect on the orbit. The underlying model for all simulations includes the dipoles, quadrupoles and sextupoles at COSY as well as the corrector magnets and BPMs (Beam Position Monitors). Since most sextupoles are only used during beam extraction, the sextupole strengths are set to zero resulting in a linear machine. The optics is adjusted in a way that the dispersion is zero in the straight sections. The closed orbit studies are performed for deuterons with a momentum of 970 MeV/c.
Highlights
The observed Matter-Antimatter asymmetry in the Universe cannot be explained by the Standard Model (SM) of Particle Physics
Since the simulation results after the orbit correction do not include BPM resolution constraints and corrector magnet uncertainties, they cannot be directly compared to the measured corrected closed orbit at COSY
The simulations show that the closed orbit at COSY is influenced much more by magnet displacements and rotations than by residual power supply oscillations
Summary
The observed Matter-Antimatter asymmetry in the Universe cannot be explained by the Standard Model (SM) of Particle Physics. Considering magnet misalignments for each dipole and quadrupole, six independent Gaussian distributed positioning errors (displacement along each axis, rotation around each axis) are generated according to Including these magnet misalignments in the model, the closed orbit is simulated and the closed orbit RMS1 is calculated in both transverse directions.
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