A.V.Arzhannikov(b), N.S.Ginzburg(a), N.Yu.Peskov(a), A.S.Sergeev(a), S.L.Sinitsky(b)
(a)Institute of Applied Physics, N-Novgorod, 603600, Russia; (b)Budker Institute of Nuclear Physics, Novosibirsk, 630090, Russia
In resent years the use of a two-dimensional distributed feedback in a planar FEL has been proposed as a method to produce spatially coherent radiation from a large size sheet relativistic electron beam. It was shown theoretically that such novel feedback mechanism, which can be realised by using a 2-D Bragg resonator, provides opportunity for practically unlimited extension of one of transverse sizes of the planar FEL. First operation of powerful FEL with 2-D distributed feedback was achieved recently.
In present paper we study a possibility to increase the second transverse size of the wave-beam by synchronising several FEL units of planar geometry. In every unit the 2-D feedback mechanism is explored. Different units are linked in chain through the transverse energy fluxes arising in every 2-D Bragg resonators. Computer simulations demonstrate possibility of synchronisation and single frequency operation of the unified oscillator even under condition that different units are driven by electron beams with slightly different energies. Experiments on synchronisation of two FEL-units are planing presently on the base of ELMI accelerator at BINP.
