Beam energy measurement at linear colliders using spin precession

Details Beam energy measurement at linear colliders using spin precession Beam energy measurement at linear colliders using spin precession

2003-02-25

arxiv.org/abs/hep-ex/0302036v3

Phys.Rev.ST Accel.Beams 6 (2003) 091002

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, Latex, 4 figures(.eps). In v.3 corresponds to journal publication. Talk at 26-th Advanced ICFA Beam Dynamic Workshop

Scientific paper

10.1103/PhysRevSTAB.6.091002

Linear collider designs foresee some bends of about 5-10 mrad. The spin precession angle of one TeV electrons on 10 mrad bend is 23.2 rad and it changes proportional to the energy. Measurement of the spin direction using Compton scattering of laser light on electrons before and after the bend allows determining the beam energy with an accuracy about of 10^{-5}. In this paper the principle of the method, the procedure of the measurement and possible errors are discussed. Some remarks about importance of plasma focusing effects in the method of beam energy measurement using Moller scattering are given.

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