Trying to couple some noise
You are trying to inject noise into the mains supply? (I am wondering - perhaps you want to test some other circuit for immunity to mains born noise? but that's not what you asked, so anyway ... )

There are really good reasons why this probably won't work well, and why you should not try to make it work better. Basically, the mains is a very stiff (i.e. low impedance) source, and you need to use a lot of energy to change it. (Yes, mains born transients are not uncommon but they typical coming from things like high power motors with poor suppression, which do have a lot of energy.) You would need a quite serious power amp after your noise generator.

(Most likely your noise generator is unable to drive the 10 ohm load anyway, unless you are already using a power amp - but don't! - which is another reason this circuit will not work. Whatever energy comes out of your noise source ends up in that resistor, which is low in relation to the 3uF caps, which have an impedance of about 1k each.)

Actually you ought to hope that this doesn't work; basically you are trying to deliberately contaminate the public mains supply, which could have unfortunate effects on other users, and is may well be illegal.

Lastly - you are connecting your "noise generator" (whatever ever it is) to a high voltage source, which might well damage it and also be unsafe.

You probably need to re-evaluate what you are trying to do - and find another way to do it. This sounds quite ill-advised to me.