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So here we have some individual components of a linear accelerator.
If we look at them very briefly, each individually,
we can see how they fit together for the operation of the whole unit.
If we start with the electron gun.
Now, the electron gun produces the electrons from this little grid,
and this sits behind the wall of the accelerator.
The electron gun is essentially, very broadly speaking,
attached to this device.
The accelerating structure,
is basically a one and a half to two metre copper tubing,
with accelerating cavities inside it.
And this structure sits approximately here in the gantry of the unit.
Now, the electrons are accelerated down the structure
by pulses of microwaves from a magnetron.
Here we have an example of a magnetron.
This is a cutaway example of the magnetron,
and if we look inside it, we can see the accelerating cavities.
So, the electrons from the gun
are accelerated down the accelerating structure,
by the pulses of microwaves.
They come down here,
and by magnets they are bent,
the electron beam is bent through 90 degrees,
hits the target and produces, by definition, the X-rays.
So here we are at the back of the linear accelerator,
behind the wall of the gantry.
There's a lot of electronic equipment,
and there's a lot of heavy machinery.
We have a lot of high tension cables.
You'll notice that the unit has a gantry mechanism running on runners.
There are counterweights here,
and there's just generally a lot of high tension equipment.
Now, at the back of the machine,
we have the electron gun,
and the electron gun is attached to the accelerating structure of the unit,
which runs the whole way down here to the bending magnets.
Here we have the magnetron surrounded by a water jacket.
So, these are the components of the linear accelerator.
It's a complex piece of electrical equipment.