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

• DOI: 10.1016/0167-5087(84)90128-5
• Publication Date: 2002-12-02T20:16:46Z
• Authors: I.F. Ginzburg; G.L. Kotkin; S.L. Panfil; V.G. Serbo; V.I. Telnov
• Keywords: 0103 physical sciences; 7. Clean energy; 01 natural sciences

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.