O'Neill cylinder can make interstellar travel possible.

The antimatter spacecraft can also look like this. The idea of that kind of system is that the anti-electrons or positrons would impact with electrons will impact with each other in the middle of the craft. The antimatter engine can use solar power for creating the cathode rays. 

The system uses cathode rays to create antimatter-matter annihilation. In that case, the cathode rays or electron beams will conduct to the chamber where gold-leaf turns part of them to positrons. That kind of system allows traveling in our planetary system or even on interstellar missions. 

The Tipler cylinder or Tipler's time machine can install to the core of the O'Neill cylinder. The Tipler's cylinder is simply a fast-rotating cylinder that dilates time in it. There is a possibility that Tipler's cylinder will install over the O'Neill cylinder. And that thing can dilate time in that system. 

There are visions that the O'Neill cylinder would cover by using fast rotating metal or plasma core. The mission of that cylinder is to dilate or stop time inside the system. The fast-rotating cylinder makes it possible to cross the speed of light virtually. 

In that case, the system will rotate the core with a speed of about 80% of the speed of light. And then, the craft will travel forward at the speed of 80% of the speed of light. That thing makes the crat will virtually cross the speed of light. 

The idea of Alcubierre dive is simple. The system must make energy travel in it when it reaches the speed of photons. 

Crossing the speed of light is very difficult because when the object reaches the speed of photons. Energy starts to travel away from it. There is the possibility to benefit the border layers. The idea is the same with Cherenkov radiation. When a particle hits the water it travels a short time faster than the speed of light. The reason for that is that the speed of light is lower in water than in air. 

And particle must release its kinetic energy in the form of a blue-light shock wave. So the same phenomenon can use to make spacecraft travel faster than the speed of light. The system creates the WARP bubble around the craft. And then it just removes that bubble. The craft will impact with plasma at a speed that is higher than the speed of light. 

Sometimes people ask why antigravity makes it possible to cross the speed of light. 

Antigravitation is one way to make a so-called WARP bubble. In that case, the antigravitation simply pushes particles out of the core of the craft. And that makes the area where is not so powerful quantum fields and matter are. So crossing the speed of light requires that there is a void or electromagnetic vacuum around the craft. 

The WARP bubbles are not the only way to make a craft that can virtually cross the speed of light. The idea is that some radiation like antimatter annihilation or laser beams are making an empty tunnel to the route of the spacecraft. 

Then that system accelerates to a speed that is as close to the speed of light as possible. And then the system will just remove the WARP bubble from the spacecraft. That thing makes the craft impact with plasma with so high speed that it just jumps out from the universe. So the craft will turn into a black hole. And the reason why its passengers will not rip in pieces is that black hole forms around them. 

Lasers and WARP-bubbles. 

There is a possibility to make weak Warp bubbles by using magnetic fields. In that case, things like air molecules will be ionized. And the magnetic field can push those molecules away from the airplane's core. That thing turns the friction lower. And the aircraft can travel faster because that thin air would not cause so much friction as it otherwise causes. 

The simplest possible laser engine is the laser ray that will make the vacuum or low-pressure area ahead of the aircraft. The laser heats air and makes molecules travel away from each other. That low-pressure area will pull the aircraft forward. 

The laser ray will ionize the air. And the magnetic system can pull those ions over the wings by using magnetic fields. 

There is a possibility that the annihilation reaction forms the shockwaves that push material away from the craft's core. Making a stable WARP bubble is very difficult. But there is the possibility to make the oscillating, short-term WARP bubbles around the spacecraft. 

The weak WARP bubbles can create by using laser light. If the core of the aircraft or spacecraft is covered by using lasers. That thing can also push molecules away from its core. There is a possibility that the aircraft's or rocket's nose is a laser. That laser pushes air molecules away from its route. The same, but more powerful effect can use to create the WARP channel or wormhole to the front of the spacecraft. 

https://en.wikipedia.org/wiki/Alcubierre_drive

https://en.wikipedia.org/wiki/Cherenkov_radiation

https://en.wikipedia.org/wiki/Tipler_cylinder

Image II: https://theaviationgeekclub.com/the-fastest-known-speed-ever-recorded-by-a-lockheed-blackbird/