Berlin 2005 – wissenschaftliches Programm
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T: Teilchenphysik
T 403: Beschleuniger
T 403.1: Vortrag
Montag, 7. März 2005, 16:30–16:45, TU H1029
The E166 Experiment at SLAC: Development of polarized positrons source for the International Linear Collider. — •Karim Laihem1, Achim Stahl1, and Hermann Kolanoski1,2 — 1DESY, Platanenallee 6, 15738 Zeuthen. — 2Humboldt-Universitaet zu Berlin
The full exploitation of the physics potential of an International Linear Collider (ILC) in addition to the LHC program, will require the development of polarized positron beams. Having both positron and electron beams polarized in the e+e− collider will be a decisive improvement for many physics studies, providing new insight into structures of couplings and thus access to the physics beyond the standard model. The concept of a polarized positron source is based mainly on the development of a circular polarized photon source. Those photons are then converted in a relatively thin target to generate longitudinally polarized positrons and electrons. Up to date and using the same concept, two different approaches have been developed to test for the first time a polarized positron source. While in an experiment at KEK a Compton back scattering is used, the E166 experiment uses one meter long helical undulator in the FFTB 50 GeV beam line to produce several MeV photons with nearly 100 percent degree of circular polarization. In this experiment, the polarization of both photons and positrons is measured simultaneously. The installation period of E166 experiment was September 2004 and the first preliminary results are expected in spring 2005.