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  • A.

    P.Potylitsyn, L.G.Sukhikh, A.V.Kostousov (Tomsk Polytechnic University, Tomsk, Russia);

  • J.

    Urakawa, A.Aryshev (KEK, Tsukuba, Japan).

Generation of soft X-ray pulse using Thomson scattering of coherent diffrac- tion radiation by a short electron bunch

The processes of generation of coherent diffraction radiation (CDR) by a short electron bunch of 45-MeV S-band electron accelerator and it’s Thomson scattering on one of the subsequent bunches have been simulated. Backward CDR is emitted when electron bunch with population and length passes in a vicinity of a conducting target along the direction of specular reflection. In the wavelength region all electrons in a bunch emit coherently and CDR intensity becomes pro- portional to the square of a bunch population. For a target with inclined angle 45o CDR beam may be extracted from the accelerator chamber at right angle to an electron beam. For this ge- ometry we calculated CDR spectral-angular distributions from concave targets with different profiles which allow to focus radiation at different distances. If the direction of specular reflec- tion coincides with electron path it is possible to use a concave target with a focal distance pro- viding the maximal overlapping of CDR pulse and a subsequent electron bunch. In this case one may obtain hard radiation in forward direction for the photon energy range as a result of Thom- son scattering. The yield of hard photons is proportional to [1]. For the following accelerator pa- rameters [2]: Beam energy - 45 MeV; Charge/bunch - 500 pC; Beam emittance - 3 mm mrad; Bunch length - 0.3 mm. we estimated the efficiency of considered schemes for obtaining of ra- diation and soft X-ray radiation ( eV) with duration ps. REFERENCES [1] A.P. Potylitsyn, Physical Review E, vol. 60, 1999, p. 2272. [2] H. Koichiro et al., Nucl.Instrum. and Methods A, 2006 (to be published).

Prof. Alexander Petrovich Potylitsyn: pap@interact.phtd.tpu.edu.ru

Plenary session: Superconducting accelerators and cryogenic tech- nology

N.A.Mezentsev (Budker Institute of Nuclear Physics, Novosibirsk, Russia)

Superconducting magnets for SR generation in Budker INP: the status of works

The synchrotron radiation (SR) user’s community in their requirements moves ahead to more rigid SR spectrum and to higher photon flux density. Performance of these requirements on SR sources with electron energy of 1-3 GeV is carried out by simple and cheap enough way – instal- lation of superconducting shifters and multipole wigglers with high magnetic field. Besides there is an opportunity of replacement of normal conducting bending magnets on superconducting ones with magnetic field up to 8.5 Tesla, that essentially expands spectral range of radiation. Pa- rameters of the superconducting magnetic systems made in Budker INP for the SR centers in the world are resulted. Consumer SR properties from these devices are discussed.

Dr. Nikolai Alexandrovich Mezentsev: mezentsev@inp.nsk.su

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