/batch,list
/prep7
et,1,plane121,,,1
v_g=0.0		! Ground Potential
v_r=5.0		! Ring Potential
v_c=0.0 	! Collector Potential
mp,perx,1,1	! Free Space
mp,perx,2,10	! Metal
/pnum,area,1
rectng,0,5,0,1     ! 1
rectng,3,4,5,6	   ! 2
rectng,0,5,1,5     ! 3
rectng,0,3,5,6     ! 4
rectng,4,5,5,6     ! 5
rectng,0,5,6,10    ! 6
rectng,0,5,10,11   ! 7
aadd,2,3,4,5,6
aglue,all
/com
/com	Now A1 is ground, A2 the ring, A7 the collector, and A2 free space
/com
asel,s,area,,2
aatt,1,1,1
asel,inve
aatt,2,1,1
asel,all
smrtsize,3
amesh,all
!--------------------------------
nsel,s,loc,x,0,5
nsel,r,loc,y,0,1
d,all,volt,v_g
!--------------------------------
nsel,s,loc,x,0,5
nsel,r,loc,y,10,11
d,all,volt,v_c
!--------------------------------
!
!--------------------------------
finish
/solution
solve
finish
/post1
/number,1
plnsol,volt
*do,i,1,2
trpoin,i*0.1+2.4,1.5,0,0.1*(-1)**(i-1),0.1*i,0,30,5
*enddo
pltrac,elec