[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

*To*: KellySt@aol.com, stevev@efn.org, jim@bogie2.bio.purdue.edu, zkulpa@zmit1.ippt.gov.pl, hous0042@maroon.tc.umn.edu, rddesign@wolfenet.com, David@InterWorld.com, lparker@destin.gulfnet.com, bmansur@oc.edu*Subject*: Re: MARS*From*: T.L.G.vanderLinden@student.utwente.nl (Timothy van der Linden)*Date*: Thu, 29 Feb 1996 17:47:59 +0100

To Brian from Tim >3. This maser thing. What exactly is a maser? A microwave beam generator? > Is there a way to reflect these microwaves with good efficiency? Perhaps >we could somehow rig a reflector to detact from our ship and reflect back >the beam and do away with a linear accelerator. Indeed it is laser with microwaves. Thus making highly directional monochromic microwaves. I remember a college-demonstration where wax (where candles are made of) where used as a lens for microwaves. (There we just used a magnetron and waveguide to generate microwaves) >4. Has anyone figured out just how long the accelerator needs to be since it >has to be linear? More to the point, can we keep the linear accelerator >short enough and, therefore, light enough to produce relativistic exhaust >velocities? Some long time ago I figured out that it would probably be too long, the formulas are not so easy to integrate so at that time I used some repeating summation. I assumed that we would not have a constant acceleration of the mass, but a constant power input. This means that initially it accelerates fast but at the end much slower. Relativistic effects do make this difference worse. But as Kevin corrected me a week ago, why not use a torus instead a lineac? You seem to have a reason for not liking a torus, could you tell me what that reason is? >5. Can we even produce the magnetic fields in an accelerator necessary to >get an exhaust velocity of .9996c for .62kg/sec. or even a .75c exhaust >velocity using say a 1km long accelerator? My understanding is that field >generators that confine magnetics fields have a tendency to blow up. I hope >I'm wrong but I thought you might know if this concern applies to the >designs we've discussed. I think we should not worry about that too much, for me this is just a problem for the gigantic-energy stack (i.e. problems involving creation and containment of gigangtic energies). Timothy

- Prev by Date:
**Re: My Two Bits Ain't Worth 1E-15 (Take 2)** - Next by Date:
**Re: your mail = Greenhouse** - Prev by thread:
**Re: MARS** - Next by thread:
**Re: MARS** - Index(es):