Natural Science Forum / Physics / Research / June 2008

Since by definition gamma rays are emitted by nuclei I'd say its
impossible. X-rays of the same wavelength however...

Yes it is. A nuclear bomb though is required to pump it. Any
wavelength can theoretically lase. There has in fact been a proposal
to use an X/Gamma ray laser in an ABM system. The theory is all known.
The idea is to point rods towards incoming missiles and then detonate
a nuclear bomb. The material will stay in place just long enough for
the laser pulse.

A free electron laser is I feel impossible as you would need the sort
of magnetic fields you get round black holes.

Whether the laser should be built or not is a political and moral
question. There are you know limits for moral scientific enquiry.

 - Ian Parker

On Jun 10, 9:52=A0am, "Green Xenon [Radium]" <gluceg...@excite.com>
wrote:

A high energy FEL appears theoretically possible and allows a modest
energy.  A several MeV energy level is allowed.  What happens is a
bunch as the wiggled electron set can not be aligned as a whole
packet, disallowing ultra high energy levels.

A 5 MeV limit effectively exists.  Distortion of the bunch causes the
magnetic field to also distort.  A focusing is not present in FEL's
because of the difficulty in field gradient versus field x-axis
acceleration.  x-axis as the wiggled axis must be a suitably high
displacement and the magnetic field density as a length causes the
field to wiggle as a whole set of accelerator magnets.  Meaning the
whole length emitts as a laser, it is not magnet element by element
Bremsstralung.

So the axis free energy as a local effect becomes the stimulated atom
set, in effect, in analogy to a gas laser. FELs are true lasers, but
atomic excitation does not occur.

Axis acceleration versus length magnetic field gradient allows a state
as a wire coil excitation. Excited field coils form the laser in FELs,
not excited gas atoms.  A property of the coil allows focusing to
overcome this limitation.  An RF waveguided cavity inside the FEL can
allow ultrahigh energy levels.  A small linac field will cause a
slight bunching preventing distortion of the wire coil's magnetic
field.

A literal vacuum cavity using suseptable metal becomes the interior of
a good simple wiggler magnet.