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A search has been performed for the lepton-flavor-nonconserving reaction /x~+Ti--*• e~+Ti using a time-projection chamber. No candidate events were observed, resulting in a limit of r^I+ I i " >g " +Ti ? < L6X10-H (90o/o C.L.) r (p + Ti -• capture) for this reaction relative to ordinary muon capture. PACS numbers: 13.60.-r, ll.30.-j, 14.60.-z, 25.30.Mr Neutrinoless muon-electron conversion in the field of a nucleus /x-+ Z--e~ + Zhas been discussed as a potentially favorable process with which to search for lepton-flavor nonconservation. 1 Many attempts to incorporate multiple generations (flavors) into the standard model of weak interactions predict branching ratios for jju-^e conver-sion (1), ft-* ey y and fi-* 3e at the level of < 10~9 relative to ordinary flavor-conserving processes, depending on the masses and couplings of hypothetical neutral particles which might mediate leptonflavor-changing processes. 2 " 5 In some models, 5 mass limits in the multiteraelectronvolt range for new particles such as flavor-changing Higgs scalars and leptoquarks have been obtained from the experimental upper limits for these reactions. The signature of

A theoretical methodology promising improved design of vacuum insulation in high-voltage pulsedpower systems is described. It consists of shaping the electromagnetic fields within the system in such a way that charged particles which can in principle initiate vacuum surface breakdown are deflected away from the insulator surface, and secondary electrons, if emitted, are prevented from restriking the surface. Thus, vacuum surface breakdown is prevented before it is able to develop. Our methodology is presented here by a set of case studies.

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