The cross section of bremsstrahlung from high-energy electron suppressed due to the multiple scattering of an emitting electron in a dense media (the LPM effect) is discussed. Development of the LPM effect theory is outlined. For the target of finite thickness one has to include boundary photon radiation as well as the interference effects. The importance of multiphoton effects is emphasized. C...

2014 Emission spectra from aluminium and copper targets excited by fast electrons have been measured. The ratio of these two measurements can be directly compared with theoretical transition radiation calculations. A well pronounced shoulder is observed at 2.1 eV giving the first experimental evidence of interband contribution to transition radiation. J. Physique LETTRES 43 (1982) L-733 L-737 C...

Coherent bremsstrahlung (CBS) is a specified type of radiation at colliders with short bunches. In the present paper we calculate the main characteristics of CBS for the BEPC collider. At this collider dN γ ∼ 3 · 10 8 dE γ /E γ photons of CBS will be emitted for a single collision of the beams in the energy range E γ < ∼ 240 eV. It seems that CBS can be a potential tool for optimizing collision...

In this paper a straightforward high energy expansion is discussed and applied to the problem of radiation from an extended target. In particular, we discuss bremsstrahlung from an electron-pulse collision. A full quantum treatment of the power spectrum and the average energy loss is given. Scaling laws that smoothly join the quantum regime to the classical limit are derived. Submitted to Physi...

We develop a microscopic model for the interaction of small rare gas clusters with soft X-ray radiation. It is shown that, while the overall charging of the clusters is rather low, unexpectedly high atomic charge states can arise due to charge imbalances inside the cluster. The mechanism does not require unusually high absorption rates, and the heating can be described by standard inverse brems...

Bremsstrahlung spectral photon distributions produced by continuous beta particles of beta emitter 147Pm and 45Ca in thick targets studied in a photon energy region 10-30 keV. The bremsstrahlung spectral photon distribution measured with X-PIPS Si (Li) detector. The experimental results were compared with the theoretical bremsstrahlung distribution obtained from ordinary bremsstrahlung (OB) the...

We develop a microscopic model for the interaction of small rare-gas clusters with soft x-ray radiation from a free electron laser. It is shown that, while the overall charging of the clusters is rather low, unexpectedly high atomic charge states can arise due to charge imbalances inside the cluster. These findings are explained by an increased absorption via inverse bremsstrahlung due to high ...

Measurements of the bremsstrahlung emission profile have been made in order to measure the effective charge (Z.n) profile in Large Helical Device (LHD). The main diagnostic system consists of a 84 optical fiber array, an interference filter and 84 photomultipliers, which gives a spatial resolution of 5 cm at the plasma center. To evaluate the contribution of impurity line radiation, the wavelen...

Crystals present a uniquely simple environment for the investigation of strong electromagnetic fields. When energetic charged particles are incident on crystals close to major crystallographic directions, their electromagnetic interactions depend crucially on the kinematic conditions. The coherence of the crystalline field can produce very strong electric fields in the rest frame of the particl...