Analysis of closed orbit deviations for a first direct deuteron electric dipole moment measurement at the cooler synchrotron COSY

8th International Particle Accelerator Conference

Schmidt, V.^1,2 ; Lehrach, A.^1,2

Institut für Kernphysik 4, Forschungszentrum Jülich, Leo-Brandt Str., Jülich

52425, Germany^1

III. Physikalisches Institut B, RWTH Aachen University, Otto-Blumenthal-Str., Aachen

52056, Germany^2

关键词: Beam extraction;    Beam position monitors;    Cooler synchrotrons;    Corrector magnets;    Linear machines;    Precise measurements;    Residual power;    Systematic uncertainties;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/874/1/012051/pdf
DOI  :  10.1088/1742-6596/874/1/012051

来源: IOP

【 摘 要 】

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.