Storage Ring
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Andrzej Magiera ◽  
Anjali Aggarwal ◽  
Vera Poncza

Abstract Various scenarios of measurements of Electric Dipole Moment (EDM) of light hadrons with the use of a storage ring were proposed. Most of these methods are based on the measurement of the vertical spin component for an initially horizontal polarized beam. Since the expected EDM effect is very small, one has to payattention to various sources of systematic uncertainties. One of the most important sources are misalignments of the magnets forming the storage ring lattice, which may produce an effect that mimics an EDM. This false signal could be much larger than the expected EDM signal, even for very small magnet misalignments. This paper describes a novel method for the determination of the contribution of magnets misalignments to the expected EDM signal. It is shown that the magnitude of this effect could be estimated via a Fourier analysis of the time-dependent vertical polarization. This could be achieved by sampling the vertical polarization with a frequency larger than the beam revolution frequency, which corresponds to polarization measurements in at least two positions in the storage ring. The presented method can be applied to any scenario proposed for EDM measurements using a storage ring.

2021 ◽  
pp. 99-105
Antonina Smygacheva ◽  
Vladimir Korchuganov ◽  
Evgenii Fomin

The Project of complete modernization of a current accelerator complex and the making of the 3-d generation light source is in progress in the NRC «Kurchatov Institute». A new booster synchrotron is part of the injection complex for a new synchrotron light source. It must ensure reliable and stable operation of the upgraded main storage ring. The paper presents the lattice of a new booster synchrotron and its main parameters.

2021 ◽  
Vol 12 (1) ◽  
Michael Gatchell ◽  
João Ameixa ◽  
MingChao Ji ◽  
Mark H. Stockett ◽  
Ansgar Simonsson ◽  

AbstractLaboratory studies play a crucial role in understanding the chemical nature of the interstellar medium (ISM), but the disconnect between experimental timescales and the timescales of reactions in space can make a direct comparison between observations, laboratory, and model results difficult. Here we study the survival of reactive fragments of the polycyclic aromatic hydrocarbon (PAH) coronene, where individual C atoms have been knocked out of the molecules in hard collisions with He atoms at stellar wind and supernova shockwave velocities. Ionic fragments are stored in the DESIREE cryogenic ion-beam storage ring where we investigate their decay for up to one second. After 10 ms the initially hot stored ions have cooled enough so that spontaneous dissociation no longer takes place at a measurable rate; a majority of the fragments remain intact and will continue to do so indefinitely in isolation. Our findings show that defective PAHs formed in energetic collisions with heavy particles may survive at thermal equilibrium in the interstellar medium indefinitely, and could play an important role in the chemistry in there, due to their increased reactivity compared to intact or photo-fragmented PAHs.

2021 ◽  
Leif Kochanneck ◽  
Henrik Ehlers ◽  
Stepan F. Mikhailov ◽  
Maurice E. Pentico ◽  
Ying K. Wu ◽  

2021 ◽  
Vol 28 (6) ◽  
Ulf Johansson ◽  
Dina Carbone ◽  
Sebastian Kalbfleisch ◽  
Alexander Björling ◽  
Maik Kahnt ◽  

NanoMAX is the first hard X-ray nanoprobe beamline at the MAX IV laboratory. It utilizes the unique properties of the world's first operational multi-bend achromat storage ring to provide an intense and coherent focused beam for experiments with several methods. In this paper we present the beamline optics design in detail, show the performance figures, and give an overview of the surrounding infrastructure and the operational diffraction endstation.

2021 ◽  
Vol 104 (3) ◽  
D. Müll ◽  
F. Grussie ◽  
K. Blaum ◽  
S. George ◽  
J. Göck ◽  

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