THE INFLUENCE OF STRONG CRYSTALLINE FIELDS ON QED-PROCESSES INVESTIGATED USING DIAMOND CRYSTALS → CRYSTALS IN γ,γ COLLIDERS

摘要

The very recent indications of Higgs-candidates at CERN have led to a strong interest in new types of facilities like high-energy photon colliders. This again leads to a search for strong high-energy gamma sources. In the present paper it is shown that single crystals are unique radiators due to the strong crystalline fields of 10~(12) V/cm or more, in which incident particles move over very large distances (～ 100μm). Along axes, radiation emission and energy loss is enhanced more than two orders of magnitude. This dramatic effect leads to radiation cooling followed by capture to high-lying channeling states. The radiation is emitted in the forward angular cone of 40 μrad or less. In the planar cases certain incident directions give hard photons with an intensity ～ 10 times the norma coherent bremsstrahlung. Therefore, in general, crystals turn out to be very interesting γ-sources for photo production and coming γ,γ colliders.