12-13 February 2014
Europe/Berlin timezone

Depolarisation at e+e- colliders due to strong fields at the interaction point

13 Feb 2014, 12:00


Institut für Kernphysik; Johannes Gutenberg-Universität Mainz; Johann-Joachim-Becher-Weg 45; D 55128 Mainz


Dr Anthony Hartin (DESY)


Depolarisation of polarised collider beams, due to the strong electromagnetic fields of the bunch-bunch collision at the IP, is important to understand for the precision physics goals of future e+e- colliders. Beam parameters are generally chosen to maximise the collision luminosity whilst minimising non-linear effects from strong IP fields. Here it will be shown that luminosity can be further enhanced by a judicious choice for the relative longitudinal position of the beam waists. A simulation study of the beam waist optimisation on depolarisation will be presented. The possibility of higher order, non-linear depolarisation effects will be discussed.

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