A new possibility to monitor collisions of relativistic heavy ions at LHC and RHIC
نویسنده
چکیده
We consider the radiation of particles of one bunch in the collective field of the oncoming bunch, called coherent bremsstrahlung (CBS). The main characteristics of CBS for LHC (in the Pb–Pb mode) and for RHIC are calculated. At LHC about 3.9 · 10dEγ/Eγ photons per second are expected for photon energies Eγ < ∼ Ec = 93 eV. It seems that CBS can be a potential tool for optimizing collisions and for measuring beam parameters. The bunch length σz can be found from the critical energy of the CBS spectrum Ec ∝ 1/σz ; the transverse bunch size σ⊥ is related to the photon rate dNγ ∝ 1/σ⊥. A specific dependence of dNγ on the impact parameter between the beams allows for a fast control over the beam displacement.
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