Cosmic ray production in superbubbles

We compute the production of cosmic rays in dynamical superbubble produced by a cluster massive stars. Stellar winds, supernova remnants and turbulence are found to accelerate particles so efficiently that nonlinear feedback must be taken into account order ensure energy balance is not violated. High do scatter on escape quickly after each explosion, which makes both their intensity inside bubble injection interstellar medium intermittent. On other hand, stochastic acceleration low hardens spectra at GeV energies. Because damp cascade, this hardening less pronounced when nonlinearities account. Nevertheless, with hard components extending up 1 10 normalised an density 100 eV cm$^{-3}$ typical signatures superbubbles. Efficient shock reacceleration within compact clusters further shown produce hard, slightly concave spectra, while presence magnetised shell enhance confinement therefore collective plasma effects acting them. eventually estimate overall contribution superbubbles galactic ray content show gamma-ray expected from hadronic interactions superbuble shells. In cases, qualitative agreement observations obtained.