z0=2400;
a=1.45;

r1=z0*sinh(a/2)/cosh(a/2);r2=z0^2/(2*r1)-r1/2;
x=sqrt(r1*(r1+2*r2));
y=sqrt(r1/(r1+2*r2));
v=sinh(a/2)/cosh(a/2);w=y-v