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
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.