ICAP2012 - List of Authors (Lehrach, A.)

Paper

Title

Page

Project Overview and Computational Needs to Measure Electric Dipole Moments at Storage Rings

7

A. Lehrach
FZJ, Jülich, Germany

The discovery of a non-zero EDM (Electric Dipole Moment) would be a signal for “new physics” beyond the standard model. EDM experiments with charged particles are only possible at storage rings. As a first step towards EDM searches in storage rings we proposed R&D work to be carried out at the Cooler Synchrotron COSY, then perform a first direct EDM measurement of a charged particle in a storage ring at COSY and on a longer time scale construct a dedicated storage ring. Full spin-tracking simulations of the entire experiment are absolutely crucial to explore the feasibility of the planned experiments. It is planned to use the COSY-INFINITY code and its updates to include higher-order nonlinearities, normal form analysis, symplectic tracking and especially spin tracking upon incorporation of RF-E/B spin flippers into the code. Adding the spin degree of freedom substantially enhances the need for the computing power. In order to study subtle effects and simulate particle and spin dynamics during the storage and build-up of the EDM signal, one needs custom-tailored fast trackers capable of following up to 100 billion turns for samples of up to 10⁶ particles.

Slides MOAAI1 [3.341 MB]

TUADI1

Storage Ring EDM Simulation: Methods and Results

99

Y. Senichev, A. Lehrach, R. Maier, D. Zyuzin
FZJ, Jülich, Germany
S.N. Andrianov, A.N. Ivanov
St. Petersburg State University, St. Petersburg, Russia
M. Berz, K. Makino
MSU, East Lansing, Michigan, USA

The idea of Electric Dipole Moment search using the electrostatic storage ring with polarized beam is based on accumulation of additional tiny spin rotation, about one-billionth of radians per second, occurred only in the presence of EDM. This method can be realized under condition of the long-time spin coherency ~1000 seconds. During this time each particle performs about 109 turns in ring moving on different trajectories. At such conditions the spin-rotation aberrations associated with various types of space and time dependent nonlinearities start playing a crucial role. To design such a ring the computer simulation is necessary taking into account all factors affecting the spin. We used COSY-Infinity and integrating program with symplectic Runge-Kutta methods in composition with analytic methods. We developed a new lattice based on the alternating spin rotating. As a result, we can achieve the SCT of ~5000 seconds. The difficulties of these studies are still in the fact that the aberrations growth is observed in the scale of 109 turns and few million particles. For this simulation we use a supercomputer with parallel computing process.

Slides TUADI1 [0.951 MB]

Paper	Title	Page
MOAAI1	Project Overview and Computational Needs to Measure Electric Dipole Moments at Storage Rings	7
	A. Lehrach FZJ, Jülich, Germany
	The discovery of a non-zero EDM (Electric Dipole Moment) would be a signal for “new physics” beyond the standard model. EDM experiments with charged particles are only possible at storage rings. As a first step towards EDM searches in storage rings we proposed R&D work to be carried out at the Cooler Synchrotron COSY, then perform a first direct EDM measurement of a charged particle in a storage ring at COSY and on a longer time scale construct a dedicated storage ring. Full spin-tracking simulations of the entire experiment are absolutely crucial to explore the feasibility of the planned experiments. It is planned to use the COSY-INFINITY code and its updates to include higher-order nonlinearities, normal form analysis, symplectic tracking and especially spin tracking upon incorporation of RF-E/B spin flippers into the code. Adding the spin degree of freedom substantially enhances the need for the computing power. In order to study subtle effects and simulate particle and spin dynamics during the storage and build-up of the EDM signal, one needs custom-tailored fast trackers capable of following up to 100 billion turns for samples of up to 10⁶ particles.
	Slides MOAAI1 [3.341 MB]

TUADI1	Storage Ring EDM Simulation: Methods and Results	99
	Y. Senichev, A. Lehrach, R. Maier, D. Zyuzin FZJ, Jülich, Germany S.N. Andrianov, A.N. Ivanov St. Petersburg State University, St. Petersburg, Russia M. Berz, K. Makino MSU, East Lansing, Michigan, USA
	The idea of Electric Dipole Moment search using the electrostatic storage ring with polarized beam is based on accumulation of additional tiny spin rotation, about one-billionth of radians per second, occurred only in the presence of EDM. This method can be realized under condition of the long-time spin coherency ~1000 seconds. During this time each particle performs about 109 turns in ring moving on different trajectories. At such conditions the spin-rotation aberrations associated with various types of space and time dependent nonlinearities start playing a crucial role. To design such a ring the computer simulation is necessary taking into account all factors affecting the spin. We used COSY-Infinity and integrating program with symplectic Runge-Kutta methods in composition with analytic methods. We developed a new lattice based on the alternating spin rotating. As a result, we can achieve the SCT of ~5000 seconds. The difficulties of these studies are still in the fact that the aberrations growth is observed in the scale of 109 turns and few million particles. For this simulation we use a supercomputer with parallel computing process.
	Slides TUADI1 [0.951 MB]