Operation of the energy spread of beam with using of exchange target

A gas jet, vapour, electron and photon beams and a thin foil can be used as the exchange target. Usually the gas target is used at the pulse mode, the foil is used at the streaming operation. Our method can be simply realised in the case of the gas target. In the foil case the realisation is more difficult. But a comfortable construction, which consists of the set of foils located at the different potentials, can be found.