65V Square wave Switching Circuit
I can think of 2 filter approaches:

1) an impedance controlled RLC filter for maximum power transfer thus 50% efficiency, using C as load

2) A RLC filter based on user's rise time requirement at given f, Vpp
 - thus  dV/dt =Ic/C and dI/dt=V/L with low Q &lt;2 and lower loss
 - but higher peak power demand for same energy stored in C load. 

Using 1)


with a period of 100 us cycle and 10us rise time at 50% efficiency 
compute the average power dumped in R.


E=0.5CV² = 0.5 * 1uF * 65V² = 2.1 mJ = 2.1 W-us means 21 Watts in 10us  
thus here is a quick &amp; dirty design