/BATCH,list
/PREP7
et,1,solid123
v_g=0.0		! Ground Potential
v_r=5.0		! Ring Potential
v_c=-5.0 	! Collector Potential
mp,perx,1,1	! Free Space
mp,perx,2,10	! Metal
/pnum,volume,1
BLOCK,-4,4,-4,4,6,7,		! vol 1     collecter
BLOCK,-4,4,-4,4,-5,-6,  	! vol 2     ground
block,-2,2,-2,2,-0.5,0.5,	! vol 3
block,-1,1,-1,1,-0.5,0.5,	! vol 4
vsbv,3,4			! vol 5
BLOCK,-4,4,-4,4,-5,6,		! vol 3
vsbv,3,5			! vol 4     free space
vglue,all			! 4->3
block,-2,2,-2,2,-0.5,0.5,	! vol 4
block,-1,1,-1,1,-0.5,0.5,	! vol 5
vsbv,4,5			! vol 6     ring
vglue,all			! 6->4
vsel,s,volume,,3
vatt,1,1,1
vsel,inve
vatt,2,1,1
vsel,all
esize,2
vmesh,all
finish
/solution
ANTYPE,STAT
!-----------------------------
vsel,s,,,4 
nslv,s,1
d,all,volt,v_r
!-----------------------------
vsel,s,,,1 
nslv,s,1
d,all,volt,v_c 
!-----------------------------
vsel,s,,,2 
nslv,s,1
d,all,volt,v_g  
!-----------------------------
nsel,all
!-----------------------------
solve
finish
!-----------------------------
/post1
plnsol,volt
!-----------------------------
*do,i,-3,3
	*do,j,-3,3
		trpoin,i*0.9,j*0.9,-4,0,0,0.7,1,15.5
	*enddo
*enddo
!-----------------------------
/VIEW,1,1,1,1   
/ANG,1  
/REP,FAST   
!-----------------------------
pltrac,elec