Okay kiddo, so let's talk about the "helicon double layer thruster."
You know how sometimes you want to move really fast, like when you're riding your bike and you pedal really hard? Well, in space, we also want to move really fast, but there's no air to pedal against. So we have to use special things called thrusters to push us along.
Now, a helicon double layer thruster is a special kind of thruster that uses something called plasma to move a spacecraft. Plasma is like a gas, but it's different because its atoms don't have any electrons attached to them. They're a lot hotter and more energetic than normal gas atoms, and they glow really brightly.
The way a helicon double layer thruster works is by using magnets and special coils of wire to make the plasma spin around really fast. And when it spins around like that, it creates something called a "double layer."
This double layer is like a wall of energy that separates the plasma on one side from the plasma on the other side. It's kind of like the wall of water that you see when you splash your hands in the bathtub. And just like with the wall of water, you can make the double layer do things - like pushing a spacecraft forward!
So when we turn on the helicon double layer thruster, it makes the plasma spin around and creates this double layer. And then, we can use that double layer to push the spacecraft forward and make it go really fast!
It's like magic, but with science instead of a wand. And that's how a helicon double layer thruster works, in a nutshell!