I was just wondering about the antimatter containment system, after reading this post. Clearly a containment field is needed since the antimatter can't be allowed to contact normal matter until it can be safely annihilated in the reaction chamber, but is there a physical reason why a passive containment field would be impossible? A magnetic field of great strength must be required to contain dense antimatter plasma, but surely a civilization with the technology to create warp drives can create permanent magnets of such strength.
There would still be potential dangers from mechanical damage to the containers (and thus the critical magnets) which could cause the containment field to fail (a very specific arrangement of the magnetic field is required to form a magnetic "bottle").
"If you can't take a little bloody nose, maybe you ought to go back home and crawl under your bed. It's not safe out here. It's wonderous, with treasures to satiate desires both subtle and gross... but it's not for the timid." Q, Q Who