Recent content by teve

OK. Then in the LHC with gamma=7500, r=4300m (C=27000m), 2808 bunches of 1.15e11 protons each (proton m=1.67e-27kg), the LHC dipole magnets exert (on the average) a radial inward force per meter of very nearly (7500*(1.67e-27kg*2808*1.15e11)(c^2)/4300m)/27000m=3.131 N/m. 6.262 N/m for the two...

So then what is the magnitude of the (relativistic) centripetal force on a particle with rest mass m traveling at velocity v in a circle of radius r as observed from a frame at rest with the center of the circle? Is it (mvv/r) times gamma, or gamma squared? It is still not clear to me. It...

The last post in the thread https://www.physicsforums.com/showthread.php?t=466305 seems to say that the relativistic force on a mass moving on a circular path is the centripetal acceleration, v*v/r, times rest mass times gamma squared. But the articles...

The last post of that thread suggests the radial force is just mv^2/r, but the velocity is multiplied by the Lorentz factor. Is this correct? Then with the LHC Lorentz factor 7500 and radius 4300m, the radial force on a proton is ((1.67e-27)(7500c)^2)/4300 = 2e-6 Newtons. For 2808 bunches...

I posted an LHC question a while back but did not get a reply. I'll ask a somewhat different, simplified and more specific question. I hope I am asking the question correctly. How much inward radial force is needed to keep a proton going in a 27 km circular path at 7 Tev or a Lorentz factor...

Now I'm curious how this compares to the oncoming background radiation being blue shifted? Assuming a round value of 200GHz for the radiation and relativistic Doppler shift and Lorentz factor of 50000 I think that make the frequency 2E+15 GHz which I think is ultraviolet. But I don't know how...

I found that two LHC beams totaling 724 MJ melts one metric ton of copper. I would think that assumes a spread out beam so that all the copper just melts. http://lhc-machine-outreach.web.cern.ch/lhc-machine-outreach/beam.htm So in 50 years (about 1.6E+9 sec) at 2000 J per square meter, that's...

Thanks. I had a feeling the intergalactic hydrogen alone, though very thin, would still be a significant problem just by roughly comparing it to the LHC. I read intergalactic hydrogen is maybe about 1 atom per cubic meter but maybe its significantly higher inside galaxies.

Intergalactic space travel and hydrogen "blasting" To travel by spaceship to Andromeda (2.5 million light years) within a life time (say 50 years) you would have to travel with a much greater Lorentz factor than LHC protons, 50000 versus 7500. The LHC supposedly can melt a metric ton of copper...

Found this: http://www.symmetrymagazine.org/breaking/2010/11/05/the-skinny-on-the-lhcs-heavy-ions/ Apparently heavy ions allow quark-gluon plasma to be studied. The lead used is the heaviest stable lead isotope, 208, purified at a dollar per milligram. A few grams is probably a lifetime...

Thanks. I think I can see the issue with charge to mass ratio. Then the next question would be what range of charge to mass ratio for particles can LHC accelerate.

I know neutrons can't be accelerated. I meant colliding neutrons when carried along with protons.

The LHC accelerates protons and lead ions. Are all the electrons stripped from the lead ions? If so, could lead ions with some electrons still be accelerated? Would there be any reason to? Could the LHC accelerate alpha particles or other nuclei? Why lead ions over lighter or heaver...

Bob S, that seems to be similar to the calculation I made from the LHC frame of reference which I think is correct. I am a little more suspicious of my second calculation.

Thanks kev. I stand corrected on the combined Lorentz factor. I did the math (algebra) wrong. If I did it right this time, the Lorentz factor for two oncoming protons each with Lorentz factor k=7500 is 2*k*k-1 = 112,499,999 which agrees with what kev came up with. I did not completely...