My barn cats are good hunters, and catch and kill many a half grown rabbit, but are quite afraid of the chickens and wouldn't think of taking one on (I do have standard sized chickens, some quite large). But chicks or young pullets are too tempting. I really wonder whether it's possible to "train" a cat not to kill a chick. Dogs, yes, absolutely. Cats? I wouldn't risk it. Keep Sampson away from the chicks until they're full grown. If you have a rooster, good! HE'LL train your cat for you!
PS: I have a Weimaraner and a Viszla mix, both hunting breeds - and they are completely relaxed and reliable around the chickens, who free range on our property, as do the dogs. I never leave the dogs out with the chickens if I am not around, but they have never - since that first steep learning curve era - made a move after a chicken. It's quite remarkable what they can learn to differentiate. Again, cats? Not so much, in my experience. Dogs will recognize and regard you as their leader, and the owner of many desirable things they can't therefore have. Cats don't appear to get that concept!