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ISSN - 01675087, Nuclear Instruments & Methods in Physics Research, 1983, vol. 219, p. 5-24

Colliding γe and γγ beams based on single-pass e+e- accelerators II. Polarization effects, monochromatization improvement

Ginzburg I. F., Kotkin G. L., Panfil S. L., Serbo V. G., Telnov V. I.

Polarization effects are considered in colliding γe and γγ beams, which are proposed to be obtained on the basis of linear e+e- colliders (by backward Compton scattering of laser light on electron beams). It is shown that using electrons and laser photons with helicities λ and Pc, such that λPc<0, essentially improves the monochromatization. The characteristic laser flash energy, A0, which is necessary to obtain a conversion coefficient k ≈ 1 with a definite degree of monochromatization, is considerably less (sometimes by one order of magnitude) in the case 2λPc = -1 in contrast to the case λPc=0. Simultaneously the luminosities Lγe and Lggγ essentially increase. Formulae are obtained which allow one to extract the polarization information about γe → X and γγ → X reactions. Perculiarities connected with the specific scheme of the γ beam preparation are discussed. Problems of the calibration of the γe and γγ collisions for the polarized beams are discussed. © 1984.