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Polarization of a stored beam by spin filtering
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2012 (English)In: Physics Letters B, ISSN 0370-2693, Vol. 718, no 1, 64-69 p.Article in journal (Refereed) Published
Abstract [en]

The PAX Collaboration has successfully performed a spin-filtering experiment with protons at the COSY-ring. The measurement allowed the determination of the spin-dependent polarizing cross section, that compares well with the theoretical prediction from the nucleon-nucleon potential. The test confirms that spin-filtering can be adopted as a method to polarize a stored beam and that the present interpretation of the mechanism in terms of the proton-proton interaction is correct. The outcome of the experiment is of utmost importance in view of the possible application of the method to polarize a beam of stored antiprotons.

Place, publisher, year, edition, pages
2012. Vol. 718, no 1, 64-69 p.
Keyword [en]
Polarized beams, Storage rings, Antiprotons
National Category
Physical Sciences
URN: urn:nbn:se:su:diva-85529DOI: 10.1016/j.physletb.2012.10.030ISI: 000311816400010OAI: diva2:585981


Available from: 2013-01-10 Created: 2013-01-08 Last updated: 2013-10-17Bibliographically approved
In thesis
1. Instrumentation development for physics with antiproton beams
Open this publication in new window or tab >>Instrumentation development for physics with antiproton beams
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis summarises work done in the preparation for the PANDA (antiproton ANnihilations at DArmstadt) experiment, that will be built at the HESR (High Energy Storage Ring) at FAIR (Facility for Antiproton and Ion Research) and for the PAX (Polarised Antiproton eXperiment) experiment proposed for the HESR.

For PANDA, characteristics of the electromagnetic calorimeter have been measured at the tagged photon beam facility at the MAX IV laboratory for 61 photon energies in the range 12-63 MeV. The tested detector array consisted of 5×5 PbWO4 (lead tungstate) crystals designed for the forward end-cap. The array was cooled to -25 °C and read out with either conventional photomultiplier tubes or vacuum phototriodes (VPTs), the photo-sensor proposed for the forward end-cap. The measured relative energy resolution with photomultiplier tubes, σ/E, (for example 6 % at 20 MeV) is well within the limits of the PANDA requirements. In tests with VPTs the lower signal-to-noise ratio deteriorates the resolution to a level suggesting that VPTs should not be used in PANDA.

For PAX, the analysing power with respect to the neutron in pd → ppn, with a transversely polarised proton beam with energy 49.3 MeV, has been measured. Data was taken at the COSY storage ring, Forschungszentrum Jülich, during an experiment in which the PAX collaboration successfully polarised a stored proton beam by spin filtering. In the measurement the beam was scattered of a deuterium cluster-jet target and the scattered protons were detected in the two silicon tracking telescopes of the ANKE detector system. The measured analysing power is compared to the predictions by chiral effective field theory at next-to-next-to-leading order by interpolating on a precalculated grid and using the sampling method.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2013. 118 p.
National Category
Accelerator Physics and Instrumentation
Research subject
urn:nbn:se:su:diva-94925 (URN)978-91-7447-728-3 (ISBN)
Public defence
2013-11-18, Lecture hall FA32 , AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 09:30 (English)

At the time of the doctoral defence the following paper was unpublished and had a status as follows: Paper 2: Manuscript.

Available from: 2013-10-26 Created: 2013-10-17 Last updated: 2014-02-04Bibliographically approved

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von Wuertemberg, Klas Marcks
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