Special Seminar：Simulations, Field Modeling, and Systematic Analyses for Muon g-2 and EDM

by Dr Eremey Valetov (Lancaster University, UK)

Friday 20 Dec 2019, 09:15 → 10:15 Asia/Shanghai

300-02 (Tsung-Dao Lee Institute (East wing of Pao Yue-Kong Library))

Abstract:

 

The Muon g-2 Experiment at Fermilab is measuring the anomalous magnetic dipole moment (MDM) of the muon using the spin precession rate in the horizontal plane in a storage ring. An understanding of the dynamics of the muon beam is essential to achieving the target accuracy of 140 ppb.

 

We have developed a highly accurate and fully Maxwellian conformal mapping method to calculate the main field of the high voltage quadrupoles of the Muon g-2 storage ring, and we used a Fourier analysis–based method to calculate their fringe field, which has explained the experimentally measured tunes. We also performed end-to-end simulations of the Muon g-2 Experiment's beamlines, and we studied the momentum-dependent muon losses, which cause a systematic shift of the measured anomalous MDM.

 

The electric dipole moment (EDM) can be measured using spin precession in the vertical plane in a storage ring. We performed a spin decoherence study and a systematic errors study for frozen spin and quasi-frozen spin EDM lattices for the JEDI (Jülich Electric Dipole moment Investigations) collaboration. EDM storage rings use electrostatic deflection of the beam. Fields of electrostatic deflectors tend to have slower falloffs than magnetic dipole fields. We studied fringe fields of electrostatic deflectors and developed a general model for their representation.

 

Biography:

 

2017 Ph.D. in Physics, Michigan State University, East Lansing, Michigan, USA
2016 Master in Mathematics, Université Pierre et Marie Curie, Paris, France
2010 M.S. in Physics,  Michigan State University, East Lansing, Michigan, USA
2005 Magister in Mechanics, Moscow State University, Moscow, Russia

 

Eremey Valetov is a postdoctoral researcher with Lancaster University and the Cockcroft Institute. He is based at Fermilab, where he performs beam dynamics research for the Muon g-2 Experiment. Eremey is also part of Michigan State University's Center for Beam Theory and Dynamical Systems. His research is focused at the intersection of accelerator physics, applied mathematics, and scientific computing. A significant portion of Eremey's research involves beamline simulations using high performance computing resources, field modeling and calculations for particle optical elements, and systematic analyses.

 

Eremey served as the team leader for Michigan State University's team at ECP/NERSC OpenMP Hackathon in 2019, where he worked on OpenMP parallelization of the scientific code COSY INFINITY. He was part of the organizing team for the 13th International Computational Accelerator Physics Conference (ICAP 2018) and the Tenth International Conference on Charged Particle Optics (CPO-10) in 2018, and in the latter his talk on aberrations of electrostatic deflectors received an award from the Microscopy Society of America.