PAC2013 - List of Authors (Dutheil, Y.)

Paper	Title	Page
MOPBA04	Polarization Profile and Spin Dynamics Simulations in the AGS Using the Zgoubi Code	180
	Y. Dutheil, L. Ahrens, H. Huang, F. Méot, V. Schoefer BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. Polarization transmission during the AGS acceleration cycle is critical for the RHIC polarized proton program, driving strong interest on the exploration of the polarization losses in the AGS. Intrinsic spin resonances are the main source of depolarization in the AGS. This results in the formation of a polarization profile since the strength of such depolarizing resonance depends on the Courant Snyder invariant of each particle. The Zgoubi code and the AGS Zgoubi on-line model now allow to explore the formation of the polarization profile during the acceleration cycle using multi-particle trackings with realistic beam and machine conditions. This paper introduces the specificities of these simulations and compares some of the latest simulated and experimental results.

MOPBA05	Design of the Injection into the 800 MeV/amu High Power Cyclotron	183
	M. Haj Tahar, Y. Dutheil, F. Méot, N. Tsoupas BNL, Upton, Long Island, New York, USA L. Calabretta INFN/LNS, Catania, Italy A. Calanna CSFNSM, Catania, Italy
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. The injection into a separated sector cyclotron (SSC) aimed at the production of a high power 800MeV/amu molecular H²⁺ beam for ADS-Reactor applications * is being designed. This work includes the definition of the parameters of the injection line, as well as beam dynamics simulations of the line and first accelerated turns using the OPERA magnetic field maps of the cyclotron sector. Both schemes of radial and vertical injection are assessed. Various optics codes are employed for that as MADX, Zgoubi. The paper details and discusses various aspects of that design study and its outcomes. * A.Calanna et al., A multi-megawatt ring cyclotron to search for CP violation in the neutrino sector, April 2011, e-Print: arXiv:1104.4985

TUPAC10	Energy Calibration in the AGS Using Depolarization Through Vertical Intrinsic Spin Resonances	466
	Y. Dutheil, L. Ahrens, H. Huang, F. Méot, V. Schoefer BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. The AGS tune jump system accelerates the crossing of 82 horizontal intrinsic resonances using two fast pulsed quadrupoles. Timing of the tune jumps requires accurate tune and energy measurements. Although cross calibration using measurements of the beam revolution frequency shows good accuracy for most of the AGS energy range it is not adequately sensitive as the beam becomes highly relativistic. This drives a strong interest for a new independent energy measurement method. Reduction in the vertical tune across vertical intrinsic spin resonances can induce important depolarization of the beam. Therefore it was proposed to use the negative vertical tune shift created by this tune jump system to calibrate the energy measurement at few locations along the AGS acceleration cycle. The fast tune jump, of ΔQ≈-0.02 within 100μs in the vertical plane, allows to accurately locate the spin resonant condition, independently from orbit or field conditions. Simulations using the AGS Zgoubi on-line model facilitates the interpretation of the experimental results. This paper introduces the experimental procedure and shows some of the latest results.

Paper

Title

Page

Polarization Profile and Spin Dynamics Simulations in the AGS Using the Zgoubi Code

180

Y. Dutheil, L. Ahrens, H. Huang, F. Méot, V. Schoefer
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
Polarization transmission during the AGS acceleration cycle is critical for the RHIC polarized proton program, driving strong interest on the exploration of the polarization losses in the AGS. Intrinsic spin resonances are the main source of depolarization in the AGS. This results in the formation of a polarization profile since the strength of such depolarizing resonance depends on the Courant Snyder invariant of each particle. The Zgoubi code and the AGS Zgoubi on-line model now allow to explore the formation of the polarization profile during the acceleration cycle using multi-particle trackings with realistic beam and machine conditions. This paper introduces the specificities of these simulations and compares some of the latest simulated and experimental results.

MOPBA05

Design of the Injection into the 800 MeV/amu High Power Cyclotron

183

M. Haj Tahar, Y. Dutheil, F. Méot, N. Tsoupas
BNL, Upton, Long Island, New York, USA
L. Calabretta
INFN/LNS, Catania, Italy
A. Calanna
CSFNSM, Catania, Italy

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
The injection into a separated sector cyclotron (SSC) aimed at the production of a high power 800MeV/amu molecular H²⁺ beam for ADS-Reactor applications * is being designed. This work includes the definition of the parameters of the injection line, as well as beam dynamics simulations of the line and first accelerated turns using the OPERA magnetic field maps of the cyclotron sector. Both schemes of radial and vertical injection are assessed. Various optics codes are employed for that as MADX, Zgoubi. The paper details and discusses various aspects of that design study and its outcomes.
* A.Calanna et al., A multi-megawatt ring cyclotron to search for CP violation in the neutrino sector, April 2011, e-Print: arXiv:1104.4985

TUPAC10

Energy Calibration in the AGS Using Depolarization Through Vertical Intrinsic Spin Resonances

466

Y. Dutheil, L. Ahrens, H. Huang, F. Méot, V. Schoefer
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
The AGS tune jump system accelerates the crossing of 82 horizontal intrinsic resonances using two fast pulsed quadrupoles. Timing of the tune jumps requires accurate tune and energy measurements. Although cross calibration using measurements of the beam revolution frequency shows good accuracy for most of the AGS energy range it is not adequately sensitive as the beam becomes highly relativistic. This drives a strong interest for a new independent energy measurement method. Reduction in the vertical tune across vertical intrinsic spin resonances can induce important depolarization of the beam. Therefore it was proposed to use the negative vertical tune shift created by this tune jump system to calibrate the energy measurement at few locations along the AGS acceleration cycle. The fast tune jump, of ΔQ≈-0.02 within 100μs in the vertical plane, allows to accurately locate the spin resonant condition, independently from orbit or field conditions. Simulations using the AGS Zgoubi on-line model facilitates the interpretation of the experimental results. This paper introduces the experimental procedure and shows some of the latest results.