parameter[e_tot] = 15e6
parameter[geometry] = closed
parameter[particle] = electron

ldl = 0.20
lds = 0.05
lqf = 0.10
lqd = 0.10
ang = pi/21.0
g = 3.5

dlh: drift, l=0.5*ldl
ds: drift, l=lds
qf: quadrupole, field_master=t, l=lqf, 
	b1_gradient=-g
qd: quadrupole, field_master=t, l=lqd, b1_gradient=g,
	x_offset=2.0*sin(0.5*ang)*beginning[p0c]/(c_light*lqd*g) + lqd*(tan(0.5*ang)-0.5*ang)/(ang*tan(0.5*ang))
p: patch, x_pitch=-0.5*ang

cell: line=(dlh,qf,ds,p,qd,p,dlh)