Observation of Polarized Positrons from an Undulator-Based Source

by: G Alexander, J Barley, Y Batygin, S Berridge, V Bharadwaj, G Bower, W Bugg, FJ Decker, R Dollan, Y Efremenko, V Gharibyan, C Hast, R Iverson, H Kolanoski, J Kovermann, K Laihem, T Lohse, KT Mcdonald, AA Mikhailichenko, Moortgat GA Pick, P Pahl, R Pitthan, R Pöschl, Reinherz E Aronis, S Riemann, A Schälicke, KP Schüler, T Schweizer, D Scott, JC Sheppard, A Stahl, ZM Szalata, D Walz, AW Weidemann

Physical Review Letters, Vol. 100, No. 21. (2008)

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Abstract

An experiment (E166) at the Stanford Linear Accelerator Center has demonstrated a scheme in which a multi-GeV electron beam passed through a helical undulator to generate multi-MeV, circularly polarized photons which were then converted in a thin target to produce positrons (and electrons) with longitudinal polarization above 80% at 6 MeV. The results are in agreement with Geant4 simulations that include the dominant polarization-dependent interactions of electrons, positrons, and photons in matter.

@article{citeulike:2857035, abstract = {An experiment (E166) at the Stanford Linear Accelerator Center has demonstrated a scheme in which a multi-GeV electron beam passed through a helical undulator to generate multi-MeV, circularly polarized photons which were then converted in a thin target to produce positrons (and electrons) with longitudinal polarization above 80\% at 6\ MeV. The results are in agreement with Geant4 simulations that include the dominant polarization-dependent interactions of electrons, positrons, and photons in matter.}, author = {Alexander, G. and Barley, J. and Batygin, Y. and Berridge, S. and Bharadwaj, V. and Bower, G. and Bugg, W. and Decker, F. J. and Dollan, R. and Efremenko, Y. and Gharibyan, V. and Hast, C. and Iverson, R. and Kolanoski, H. and Kovermann, J. and Laihem, K. and Lohse, T. and Mcdonald, K. T. and Mikhailichenko, A. A. and Pick, Moortgat G. A. and Pahl, P. and Pitthan, R. and P\"oschl, R. and Aronis, Reinherz E. and Riemann, S. and Sch\"alicke, A. and Sch\"uler, K. P. and Schweizer, T. and Scott, D. and Sheppard, J. C. and Stahl, A. and Szalata, Z. M. and Walz, D. and Weidemann, A. W. }, citeulike-article-id = {2857035}, doi = {http://dx.doi.org/10.1103/PhysRevLett.100.210801}, journal = {Physical Review Letters}, keywords = {beam, helical, polarized, positron, wiggler}, number = {21}, posted-at = {2008-06-02 14:58:19}, priority = {2}, publisher = {APS}, title = {Observation of Polarized Positrons from an Undulator-Based Source}, url = {http://dx.doi.org/10.1103/PhysRevLett.100.210801}, volume = {100}, year = {2008} }

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TY - JOUR ID - citeulike:2857035 L3 - citeulike-article-id:2857035 TI - Observation of Polarized Positrons from an Undulator-Based Source JF - Physical Review Letters VL - 100 IS - 21 PB - APS N2 - An experiment (E166) at the Stanford Linear Accelerator Center has demonstrated a scheme in which a multi-GeV electron beam passed through a helical undulator to generate multi-MeV, circularly polarized photons which were then converted in a thin target to produce positrons (and electrons) with longitudinal polarization above 80% at 6 MeV. The results are in agreement with Geant4 simulations that include the dominant polarization-dependent interactions of electrons, positrons, and photons in matter. KW - beam KW - helical KW - polarized KW - positron KW - wiggler AU - Alexander, G AU - Barley, J AU - Batygin, Y AU - Berridge, S AU - Bharadwaj, V AU - Bower, G AU - Bugg, W AU - Decker, FJ AU - Dollan, R AU - Efremenko, Y AU - Gharibyan, V AU - Hast, C AU - Iverson, R AU - Kolanoski, H AU - Kovermann, J AU - Laihem, K AU - Lohse, T AU - Mcdonald, KT AU - Mikhailichenko, AA AU - Pick, Moortgat AU - Pahl, P AU - Pitthan, R AU - P\"oschl, R AU - Aronis, Reinherz AU - Riemann, S AU - Sch\"alicke, A AU - Sch\"uler, KP AU - Schweizer, T AU - Scott, D AU - Sheppard, JC AU - Stahl, A AU - Szalata, ZM AU - Walz, D AU - Weidemann, AW PY - 2008/// UR - http://dx.doi.org/10.1103/PhysRevLett.100.210801 ER -

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