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Re: RE: starship-design: Hull Materials
In a message dated 11/11/97 2:52:33 AM, firstname.lastname@example.org wrote:
>On Monday, November 10, 1997 10:37 AM, Antonio C T Rocha
>> A few doubts regarding radiation shielding and fractional lightspeed.
>> Would there be any considerable effect from doppler-shifting of
>> radiation - taking into consideration relativistic effects?.
>> Ditto for particles?
>I don't think Doppler shift is the problem, it is total energy in the
>quanta rather than its frequency - a megajoule laser is more powerful than
>a milliwatt x-ray, period. This the problem with particulate matter though,
>a grain of sand impacting the ship at near c contains quite a bit of
>energy, we don't even want to think about hitting anything larger. As
>Timothy pointed out, dust alone is going to cause significant erosion and
>thermal gain, "streamlining" may begin to make sense again.
>It should be possible to at least deflect charged particles with some sort
>of magnetic field, but a lot of these particles are going to either be
>neutral or simply to massive to deflect in time so the hull has to be
>capable of absorbing quite a bit of impact for long durations. This means
>high melting points, high thermal transmissivity or a least high
>emissivity, extremely hard and yet ductile enough to remain "tough for
>several years of use.
Oh, did I mention the dust shield idea? You dump a cloud of fine dust or gas
ahead of you. The debres slams into it and vaporizes, or at least ionizes.
The resulting plasma is fairly easy to steer magnetically.