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Results are presented from experimental studies of the spatial distribution of the density of matter in the central part of the discharge gap and the formation of the temporal profile of the X ray power in the course of implosion of quasi spherical wire arrays at discharge currents of up to 4 MA. The spatial distribution of the X ray intensity in the central part of the discharge gap and the temporal profile of the X ray power are used as implosion characteristics of quasi spherical wire arrays. The quasi spherical arrays were formed by the radial stretching of unstrained wires of initially cylindrical and conical wire arrays under the action of the electrostatic field. The temporal profile of the output X ray pulse in the photon energy range of 0.1-1 keV is shown to depend on both the geometrical parameters of the quasi spherical array and the longitudinal distri bution of its mass. It is found that a 40% increase in the wire mass due to deposition of an additional mass in the equatorial region of a quasi spherical array leads to a 15% increase in the average current radius of the pinch and a 30% decrease in the X ray yield. Experiments with quasi spherical arrays made of kapron fibers with deposited Al and Bi conducting layers were also carried out. It is demonstrated that application of such arrays makes it possible to control the profile and duration of the generated X ray pulse by varying the mass, material, and location of the deposited layer. It is found that deposition of an additional mass in the form of a thin Bi stripe on tungsten wires near the cathode end of the array allows one to mitigate the influence of the cathode zipper effect on the pinch compression and formation of the X ray pulse in tungsten arrays.

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