Improved Small-Sized X-band Microtrone on 5 MeV

After the rst publication where the idea of a microtrone [1] has been described, e ective ways of injection electrons in this accelerator [2] and e ective modes of acceleration [3] have been o ered and realized. Then began application of these machines for the decision of fundamental and applied tasks. Development of a X-band with the purpose of creation of small-sized, transportable microtrones has been complicated because of the limited electric durability of the accelerating cavity. In SSU the mode of acceleration with a low gain of energy (300 keV, Ω = 0, 62) has been o ered and realized [4]. Now it is applied in all X-band microtrons. The further development of a microtrone direction in SSU is described in [5]. One of probable ways of improvement mass and size parameters of classical microtrones is creation of the combined microwave systems of the magnetron the accelerating cavity. In which the accelerating cavity is a part of the anode block of magnetron or is connected to it directly. In the report results of calculations of transients in the microwave system of a classical microtrone made as a monoblock magnetron the accelerating cavity and results of research of magnetic system are submitted. Size of an induction of a magnetic eld of a microtrone in 2 3 time it is less than magnetron's rated eld both in S and in a X-band. It does not allow to place the anode block serial magnetron in an interpolar backlash of a microtrone and to unit their magnetic systems. The anode block magnetron is possible for placing only behind an external wall of the yoke and to connect with the cavity the coupling element which length is commensurable with in the length of a wave of oscillations. In all existing classical microtrones the magnetic eld is created by electromagnets as was it is o ered still in [2]. Their main lacks the big weight, expenses power supply, necessity of stabilization of a current, necessity of cooling by water or compressed air. Permanent magnets are deprived the speci ed lacks and favourably di er high reliability. Now there are magnetic materials on to basis erogeneity metals, such as Ne-Fe-B and Sm-Co. They possess high power parameters: residual induction (up to 1,41 T) and value of power product BHmax (up to 360 kJ/m3). On the basis of such materials have been created end magnets racetrack microtrones [6, 7]. With the help of program Poisson calculations of magnetic system of a X-band microtrone of have been carried out on the basis of the permanent magnets executed from Ne-Fe-B. They have shown, that minimally possible distance between an external wall of the yoke and area of a homogeneous magnetic eld of a microtrone about 20 mm. It approximately half of length of a wave in a X-band. We shall consider connection of the magnetron's anode block and the accelerating cavity of a microtrone the coupling element which length is not shorter than half of length of a wave.