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Title: Physics Program at COSY-Juelich with Polarized Hadronic Probes

Abstract

Hadron physics aims at a fundamental understanding of all particles and their interactions that are subject to the strong force. Experiments using hadronic probes could contribute to shed light on open questions on the structure of hadrons and their interaction as well as the symmetries of nature. The COoler SYnchrotron COSY at the Forschungszentrum Juelich accelerates protons and deuterons with momenta up to 3.7 GeV/c. The availability of both an electron cooler as well as a stochastic beam cooling system allows for precision measurements, using polarized proton and deuteron beams in combination with polarized Hydrogen or Deuterium targets.This contribution summarizes the ongoing physics program at the COSY facility using ANKE, WASA and TOF detector systems with polarized hadronic probes, highlighting recent results and outlining the new developments.

Authors:
 [1]
  1. Institut fuer Kernphysik, Forschungszentrum Juelich and Juelich Center for Hadron Physics Leo-Brandt-Str. 1, 52425 Juelich (Germany)
Publication Date:
OSTI Identifier:
21316989
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1149; Journal Issue: 1; Conference: 18. international spin physics symposium, Charlottesville, VA (United States), 6-11 Oct 2008; Other Information: DOI: 10.1063/1.3215726; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ACCURACY; COSY STORAGE RING; DEUTERIUM TARGET; DEUTERON BEAMS; DEUTERON REACTIONS; FORSCHUNGSZENTRUM JUELICH; GEV RANGE; HYDROGEN 1 TARGET; POLARIZATION; POLARIZED BEAMS; POLARIZED TARGETS; PROTON BEAMS; PROTON REACTIONS; PROTON-PROTON INTERACTIONS; SYMMETRY

Citation Formats

Kacharava, Andro. Physics Program at COSY-Juelich with Polarized Hadronic Probes. United States: N. p., 2009. Web. doi:10.1063/1.3215726.
Kacharava, Andro. Physics Program at COSY-Juelich with Polarized Hadronic Probes. United States. doi:10.1063/1.3215726.
Kacharava, Andro. 2009. "Physics Program at COSY-Juelich with Polarized Hadronic Probes". United States. doi:10.1063/1.3215726.
@article{osti_21316989,
title = {Physics Program at COSY-Juelich with Polarized Hadronic Probes},
author = {Kacharava, Andro},
abstractNote = {Hadron physics aims at a fundamental understanding of all particles and their interactions that are subject to the strong force. Experiments using hadronic probes could contribute to shed light on open questions on the structure of hadrons and their interaction as well as the symmetries of nature. The COoler SYnchrotron COSY at the Forschungszentrum Juelich accelerates protons and deuterons with momenta up to 3.7 GeV/c. The availability of both an electron cooler as well as a stochastic beam cooling system allows for precision measurements, using polarized proton and deuteron beams in combination with polarized Hydrogen or Deuterium targets.This contribution summarizes the ongoing physics program at the COSY facility using ANKE, WASA and TOF detector systems with polarized hadronic probes, highlighting recent results and outlining the new developments.},
doi = {10.1063/1.3215726},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1149,
place = {United States},
year = 2009,
month = 8
}
  • The polarized ion source at the cooler synchrotron facility COSY of the research centre Juelich in Germany delivers negative polarized protons or deuterons for medium energy experiments. The polarized ion source, originally built by the universities of Bonn, Erlangen and Cologne, is based on the colliding beams principle, using after an upgrade procedure an intense pulsed neutralized caesium beam for charge exchange with a pulsed highly polarized hydrogen beam. The source is operated at 0.5 Hz repetition rate with 20 ms pulse length, which is the maximum useful length for the injection into the synchrotron. Routinely intensities of 20 {mu}Amore » are delivered for injection into the cyclotron of the COSY facility. For internal targets the intensity of 2 mA and a polarization up to 90% have been reached. Reliable long-term operation for experiments at COSY for up to 9 weeks has been achieved. Since 2003 polarized deuterons with different combinations of vector and tensor polarization were delivered to experiments.« less
  • The polarized negative light ion source at the Cooler Synchrotron COSY in Juelich is based on the colliding beams principle. Using an intense pulsed neutralized cesium beam for the charge exchange with a pulsed highly polarized hydrogen beam intensities of 50 {mu}A have been achieved at the end of 2005. The steady improvement has lead to a gain of a factor of three in the total charge contained in one pulse, compared to the record value achieved in 2001. This report sums up the characteristics of the ion source and its components in their present mode of operation and describesmore » the ongoing efforts for still higher beam intensities.« less
  • By advancing the components of the polarized negative ion source the number of polarized particles for injection into the cyclotron injector of the cooler synchrotron COSY at the IKP of the Forschungszentrum Juelich has been increased, since 2000, by a factor of three to 5.5x10{sup 12} H{sup -} ions, delivered in a 20 milliseconds pulse with a repetition rate of 2 seconds. This report sums up briefly the characteristics of the ion source in its present mode of operation and describes the achievements towards higher beam intensities as well as for providing polarized H{sup -} and D{sup -} beams withmore » high reliability.« less
  • An atomic-beam target (ABT) for the EDDA experiment has been built in Bonn and was tested for the very first time at the cooler synchrotron COSY. The ABT differs from the polarized colliding-beams ion source for COSY in the DC-operation of the dissociator and the use of permanent 6-pole magnets. At present the beam optics of the ABT is set-up for maximum density in the interaction zone, but for target-cell operation it can be modified to give maximum intensity. The modular concept of this atomic ground-state target allows to provide all vector- (and tensor) polarizations for protons and deuterons, respectively.more » Up to now the polarization of the atomic-beam could be verified by the EDDA experiment to be > or approx. 80% with a density in the interaction zone of > or approx. 10{sup 11} atoms/cm{sup 2}.« less
  • The polarized ion source at the cooler synchrotron COSY in Juelich has been designed for the cooler synchrotron COSY and the injector cyclotron JULIC. The source is based on the colliding beams concept and delivers an pulsed H{sup -} current of over 20 {mu}A within an emittance {epsilon} of less than 0.5 {pi} mm mrad ({beta}{gamma} normalized). The polarization P is in excess of 85%. A substantial enhancement of the H{sup -} current results from the pulsing of the atomic beam part and the improvement of the neutral cesium intensity.