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Simbol-X will push grazing incidence imaging up to 80 keV, providing a strongimprovement both in sensitivity and angular resolution compared to allinstruments that have operated so far above 10 keV. The superb hard X-rayimaging capability will be guaranteed by a mirror module of 100 electroformedNickel shells with a multilayer reflecting coating. Here we will describe thetechnogical development and solutions adopted for the fabrication of the mirrormodule, that must guarantee an Half Energy Width (HEW) better than 20 arcsecfrom 0.5 up to 30 keV and a goal of 40 arcsec at 60 keV. During the phase A,terminated at the end of 2008, we have developed three engineering models withtwo, two and three shells, respectively. The most critical aspects in thedevelopment of the Simbol-X mirrors are i) the production of the 100 mandrelswith very good surface quality within the timeline of the mission; ii) thereplication of shells that must be very thin (a factor of 2 thinner than thoseof XMM-Newton) and still have very good image quality up to 80 keV; iii) thedevelopment of an integration process that allows us to integrate these verythin mirrors maintaining their intrinsic good image quality. The Phase A studyhas shown that we can fabricate the mandrels with the needed quality and thatwe have developed a valid integration process. The shells that we have producedso far have a quite good image quality, e.g. HEW <~30 arcsec at 30 keV, andeffective area. However, we still need to make some improvements to reach therequirements. We will briefly present these results and discuss the possibleimprovements that we will investigate during phase B.

Simbol-X Hard X-ray Focusing Mirrors: Results Obtained During the Phase A Study