Author: Lorentz, B.
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MOPOY002 Towards Beam-Dynamics Simulations Including More Realistic Field Descriptions for the HESR 847
  • J.H. Hetzel, U. Bechstedt, J. Böker, A. Lehrach, B. Lorentz, R. Tölle
    FZJ, Jülich, Germany
  The High Energy Storage Ring (HESR) is part of the upcoming Facility for Antiproton and Ion Research (FAIR) placed in Darmstadt (Germany). The HESR is designed for antiprotons with a momentum range from 1.5 GeV/c to 15 GeV/c, but will as well be suitable to provide heavy ion beams with a momentum range from approximately 0.6 GeV/c to 5.8 GeV/c. To guarantee smooth operation it is crucial to verify and improve the design with beam-dynamics simulations. Particularly the dynamic aperture is calculated as a measure of quality. Complementary to previous beam dynamics calculations based on frequency map analysis*, the dynamic aperture is calculated using a variant of the Lyapunov exponent. The first bending and focusing magnets have been delivered and the magnetic fields measured recently. So the modeled assumptions regarding the multipole imperfections of these elements are now replaced by values based on measurements. This contribution contains the inclusion of the measured values as well as the the tracking-based dynamic aperture calculations.
* D.M. Welsch, A. Lehrach, B. Lorentz, R.Maier, D. Prasuhn, R.Tölle: "Investigation and Optimization of Transverse Non-Linear Beam Dynamics in the High-Energy Storage Ring HESR"; IPAC'10
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY002  
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TUPMR026 First Experience of Applying Loco for Optics at Cosy 1294
  • D. Ji
    IHEP, Beijing, People's Republic of China
  • M. Bai, Y. Dutheil, F. Hinder, B. Lorentz, M. Simon, C. Weidemann
    FZJ, Jülich, Germany
  COSY is a cooler synchrotron designed for internal target hadron physics experiments, equipped with both electron cooling system and stochastic cooling system. During the past couple of years, COSY has been evolved into an ideal test facility for accelerator technology development as well as detector development for the Facility of Anti-proton and Ion Research at Darmstadt (FAIR). In addition, COSY has been the test ground for exploring the feasibility of a storage ring based Electric Dipole Moment (EDM) measurement. The proposed precursor experiment of a direct measurement of the EDM of the deuteron at COSY using an RF wien filter by the Jülich Electric Dipole moment Investigation (JEDI) requests significant improvement of beam based measurements as well as beam control. In this paper, first results of measured linear optics based on AT-LOCO are reported. Simulation studies are also discussed.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR026  
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THPMB009 Model Driven Machine Improvement of COSY Based on ORM Data 3240
  • C. Weidemann, M. Bai, F. Hinder, B. Lorentz
    FZJ, Jülich, Germany
  The COoler SYnchrotron in Jülich accelerates and stores unpolarized and polarized proton or deuteron beams in the momentum range between 0.3 GeV/c and 3.65 GeV/c [*,**]. This, in combination with its diverse capabilities of phase space cooling and the flexibility of the lattice with respect to ion-optical settings makes COSY an ideal test facility for accelerator technology development. High demands on beam control and beam based measurements have to be fulfilled for future experiments such as the proposed precursor experiment for a direct measurement of the electric dipole moment of the deuteron (see [***] and references within). The analysis of measured orbit response matrices (ORM), which com- prise the focussing structure of the ring, allows for a better understand- ing of machine imperfections such as gradient errors and misalignments of quadrupole magnets. This contribution presents the development of a MAD-X based LOCO (Linear Optics from Closed Orbits) algorithm [****] in a C++ program aiming to calibrate and correct linear optics as well as improving beam control at COSY.
* R. Maier, NIM A 390, 1 (1997).
** S.A. Martin et al., NIM A 236, 249-255 (1985).
*** D. Eversmann et al. [JEDI Collaboration], Phys. Rev. Lett. 115, 094801 (2015).
**** J. Safranek, NIM A 388, 27 (1997).
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB009  
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THPMR005 Systematic Errors Investigation in Frozen and Quasi-Frozen Spin Lattices of Deuteron EDM Ring 3394
  • V. Senichev, B. Lorentz
    FZJ, Jülich, Germany
  • S.N. Andrianov, A.N. Ivanov
    St. Petersburg State University, St. Petersburg, Russia
  • M. Berz, E. Valetov
    MSU, East Lansing, Michigan, USA
  • S. Chekmenev, J. Pretz
    RWTH, Aachen, Germany
  The search for the electric dipole moment (EDM) in the storage ring raises two questions: how to create conditions for maximum growth of the total EDM signal of all particles in bunch, and how to differentiate the EDM signal from the induced magnetic dipole moment (MDM) signal. The T-BMT equation distinctly addresses each issue. Because the EDM signal is proportional to the projection of the spin on the direction of the momentum, it is desirable to freeze the spin direction of all particles in a bunch along momentum. It can be successfully implemented in the Quasi Frozen (QFS) and Frozen (FS) Spin structures. However, in case of magnet misalignments, the induced MDM signal may arise in the same plane as the EDM signal and thereby prevent its registration. In this paper, we analyze the effect of errors together with the spin-tune decoherence of all particles in the bunch for FS and QFS options.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR005  
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