الفهرس 
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Abstract
In this thesis, a new mo4ifiation of the charge simu-atioa is presented for treating electric field b1s, •specill7 srowzd surface irregularities jrom )W .o&etorS. Such irregularities are sepr enta’d for simpliy a. gia. L1E-1t j4 Therefore, the main object is to alculatc the fielt. values in the vicinity pf a ain51ê p*tsioii bEing Da’ctr’aliz.d ox’ acIi t0 the 1w ziçc,r. The method. is based n i odu.oi a known set fcharas which are d.duc.d frozi the analysia a similarb t aimpl., problems. Good estimate of these charges in si4ition to a set of uzik.uown charges are used to simulate the iLctor with its protraion. The better the choice .f the known charges the wijl be tb.a tU*nOwn charges,, ADd the computational tiino.
The Nethc4 howe4 a considerable improvement over a provioia method as regards the accuracy aM. computational tie. for the conical protrusion with a hemispherical cap. Th. pr•sent method has no restrictions as regard the shape of x’otraaj0i,. Cases of spherical, hemispherical, and rod 4 P*ons were considered. Also, tne method of calcula— tion was used to check the emprical formui,a.—comonly used in literatur.for fieJA caculat,zi in the vicinity of Surface protru.ons.