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Photon Emission in Crystalline Undulators

Objective

The project is devoted to a theoretical and experimental study of a possibility to create a new, powerful source of high-frequency monochromatic electromagnetic radiation of a free-electron laser (FEL) type formed by a bunch of ultra-relativistic particles channelling through a periodically bent crystal. Two fundamental phenomena will be investigated: (1) the undulator radiation by ultra-relativistic positrons during channelling in periodically bent crystals, (2) the lasing effect in such systems. The final goal of our efforts is to construct new sources of monochromatic electromagnetic radiation operating in the energy range from X- up to Gamma-rays. These energies by far exceed those, which are achievable at present or are planned to be achieved by means of conventional undulators and FELs based on the action of a magnetic field. To achieve the goal we plan the following:
(1) To develop an adequate theory of spontaneous and stimulated emission in crystalline undulators, and on its basis to formulate exact recommendations on the ranges of parameters of crystals, beams and bending shapes within which it is possible to create a crystalline undulator and a crystal-based FEL,
(2) To investigate, theoretically and experimentally, the alternative options for construction of crystalline undulators. A priori it is not clear which type of crystal media to use as well as which method to apply to create a periodic structure (supersonic wave, or Si-Ge graded strained composition, or mechanical deformation)
(3) To carry out experiments on testing the quality of the structures utilized in crystalline undulators
(4) To carry out experiments on propagation of a beam of ultra-relativistic particles through a crystalline undulator and on measurements and manipulation of the emitted electromagnetic radiation
(5) To investigate experimentally the lasing effect in a crystalline undulator and the possibility of construction of the operating Gamma-laser

Call for proposal

FP6-2003-NEST-A
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Funding Scheme

STREP - Specific Targeted Research Project

Coordinator

JOHANN WOLFGANG GOETHE UNIVERSITAET FRANKFURT AM MAIN
Address
Senckenberganlage 31
Frankfurt Am Main
Germany

Participants (3)

AARHUS UNIVERSITET
Denmark
Address
Nordre Ringgade 1
Aarhus C
IMPERIAL COLLEGE OF SCIENCE, TECHNOLOGY AND MEDICINE
United Kingdom
Address
Exhibition Road, South Kensington Campus
London
JOHANNES GUTENBERG UNIVERSITAT MAINZ
Germany
Address
Saarstr. 21
Mainz