I am trying to design a high voltage low current power supply. My purpose is to design it without a transformer. For example circuit like this :

My input is 220V AC after this circuit I am going to add some current limitter and also voltage rectifier circuit to have it in DC mode. I have seen a lot of design which is with transformer. And I thought that I can have this circuit to fullfil my needs.(which is 220V AC input ~ 800 or 1000V DC output.) Am I have to use transformer or is it just enough?.

I am trying to design a high voltage low current power supply. My purpose is to design it without a transformer. For example circuit like this :

My input is 220V AC after this circuit I am going to add some current limitter and also voltage rectifier circuit to have it in DC mode. I have seen a lot of design which is with transformer. And I thought that I can have this circuit to fullfil my needs.(which is 220V AC input ~ 800 or 1000V DC output.) Am I have to use transformer or is it just enough?. Another question is: I couldn't find any step up transformer on the internet. If I step 220 AC down to 12V and after that is it posible to increase 12V to 1000V?