Help with circuit (voltage doubler)
I think you will see more interesting signals if you set your transient analysis so you can observe the initial milliseconds of your circuit. It looks like you set "Time to start saving data"=0.9. Set it to 0 and change the "stop time" to 0.2 (you will see the first 10 cycles) and you will realize what is going on.
You can access these parameters by right clicking over the .tran statement in LTSpice. 
Good luck!