Abstract
Crystalline undulators with periodically deformed crystallographic planes offer coherent electromagnetic fields on the order of 1000 T and provide undulator period $L$ in submillimeter range. We present an idea for creation of a crystalline undulator and report its realization. One face of a silicon crystal was given periodic microscratches (grooves) by means of a diamond blade, with a period ranging from 0.1 to 0.5 mm in different samples. The x-ray tests of the crystal deformation have shown that a sinusoidal-like shape of crystalline planes goes through the bulk of the crystals. This opens up the possibility for experiments with high-energy particles channeled in the crystalline undulator, a new compact source of radiation. The first experiments on photon emission in the crystal undulator are in preparation at IHEP (Protvino) with 2--15 GeV positrons and at LNF (Frascati) with 500--800 MeV positrons, aiming to produce undulator photons in the range of 50--500 keV. The results of Monte Carlo simulations for the planned experiments are presented as well.
Highlights
Accelerator-based sources of hard-photon radiation are a rapidly developing field, as can be seen, e.g., from a topical issue of Beam Line [1]
The energy of a photon emitted in an undulator is in proportion to the square of the particle Lorentz factor and in inverse proportion to the undulator period L: h! 2h 2c=L
A collaboration of researchers working at the 70 GeV accelerator of IHEP has recently achieved a substantial progress in the efficiency of crystal-assisted beam deflection: extraction efficiency larger than 85% has been obtained at intensity as high as 1012 protons [16]
Summary
Accelerator-based sources of hard-photon radiation are a rapidly developing field, as can be seen, e.g., from a topical issue of Beam Line [1]. The energy of a photon emitted in an undulator is in proportion to the square of the particle Lorentz factor and in inverse proportion to the undulator period L: h! The crystalline undulators with periodically deformed crystallographic planes offer electromagnetic fields on the order of 1000 T and could provide a period L in the submillimeter range. This way, a hundredfold gain in the energy of emitted photons would be reached, as compared to a usual undulator. A collaboration of researchers working at the 70 GeV accelerator of IHEP has recently achieved a substantial progress in the efficiency of crystal-assisted beam deflection: extraction efficiency larger than 85% has been obtained at intensity as high as 1012 protons [16]
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