Beam-based alignment tests at the Cooler Synchrotron (COSY)
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Beam-based alignment tests at the Cooler Synchrotron (COSY) Tim Wagner
on behalf of JEDI Collaboration1
Published online: 28 November 2018 © Springer Nature Switzerland AG 2018
Abstract The J¨ulich Electric Dipole moment Investigation (JEDI) Collaboration works on a measurement of the electric dipole moment (EDM) of charged hadrons using a storage ring. Such a dipole moment would violate CP symmetry, providing a possible option for physics beyond the Standard Model. The JEDI experiment requires a small beam orbit root mean square (RMS) in order to control systematic uncertainties. Therefore an ongoing upgrade of the Cooler Synchrotron (COSY) at Forschungszentrum J¨ulich is done in order to improve the precision of the beam position. The first results of the beam based alignment method, that was tested with one quadrupole in the ring, will be discussed. Keywords Beam-based alignment · Quadrupole · Cooler Synchrotron · COSY
1 Introduction There is an observable matter-antimatter asymmetry in the universe. In order to explain that, there are more CP violating effects needed [1] than contained in the Standard Model already. One candidate for that is a non vanishing electric dipole moment (EDM) of subatomic particles, as permanent EDMs of subatomic particles violate parity and time reversal symmetry. Thus they also violate CP symmetry, in case the CPT theorem holds. The predictions of the EDM of the Standard Model are orders of magnitude too small to explain the dominance of matter in the universe. The discovery of a larger EDM would hint towards physics beyond the Standard Model and contribute towards an explanation for the dominance of matter. It is possible to measure the EDM of subatomic particles by observing the interaction of their spin with strong electric fields. As the J¨ulich Electric Dipole moment Investigation (JEDI) Collaboration aims to measure the EDM of charged subatomic particles, namely This article is part of the Topical Collection on Proceedings of the 7th Symposium on Symmetries in Subatomic Physics (SSP 2018), Aachen, Germany, 10-15 June 2018 Edited by Hans Str¨oher, J¨org Pretz, Livia Ludhova and Achim Stahl Tim Wagner
[email protected] http://collaborations.fz-juelich.de/ikp/jedi/ 1
Institut f¨ur Kernphysik, Forschungszentrum J¨ulich, 52425 J¨ulich, Germany
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Table 1 Explanation of the parameters in (1) Parameter
Meaning
x
Orbit change
s
Measurement position
s0
Position of quadrupole
k
Change in quadrupole strength
x(s0 )
Position of the beam with respect to the magnetic center of the quadrupole
l
Length of quadrupole
Bρ
Magnetic rigidity of the beam
k
Quadrupole strength
β
Beta function
ν
Betatron tune
φ
Betatron phase
protons and deuterons, one needs to have a very precise storage ring for those measurements [2]. In order to improve the precision of the Cooler Synchrotron (COSY) with the beambased alignment method, it was tested with one quadrupole.
2 Theoretical description of beam-based alignment When on
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