What does it mean for a black hole to be spinning ? It has no electric charge, or if it does the space is so curved that photons carrying electromagnetic force are twisted back into the hole. How is gravity affected by angular momentum ? If there was a large imbalance in mass distribution around the axis of rotation then I could see that might create gravitational ripples, but it seems unlikely that a black hole would be lopsided. What even is it that can spin inside a black hole ? Eventually even the constituent hadrons are getting ripped apart by gravity What is left to spin when even chromodynamics can't exert a tangent to the gravitational centripetal force ? Perhaps past the event horizon, it's still normal matter spinning until it is ripped apart. Does a hungry black hole with no material falling into it still spin ?
Also why am I asking so many questions ? Are you all supposed to be smart or something ?
They're using beryllium for the plasma facing walls at ITER because of its nuclear properties, as well as its mechanical stiffness. Plasma facing components are exposed to constant neutron bombardment resulting in formation of radioisotopes. Beryllium forms radioisotopes with a short half life (so obviously not 10Be, which is 2+M years, probably 8Be and 7Be) and which have manageable decay paths. The modular shields are replaced when they get too "hot". They are low level waste for 200 years, after which you can put them back in or do whatever else you like to do with beryllium (not breathing it's dust is good).
Beryllium can also release a neutron under alpha decay, which is sometimes used in bomb trigger mechanisms. Not sure if that is useful in the tubes.
Aluminum is so much cheaper that there would have to be a very good reason not to use it. Maybe it results in a lot of 26Al with a half life of 7.2*10^5 y.
Slashdot Mirror
Who wants haters like the bathroom scales getting nerd raged by my troll fridge ?
What does it mean for a black hole to be spinning ? It has no electric charge, or if it does the space is so curved that photons carrying electromagnetic force are twisted back into the hole. How is gravity affected by angular momentum ? If there was a large imbalance in mass distribution around the axis of rotation then I could see that might create gravitational ripples, but it seems unlikely that a black hole would be lopsided. What even is it that can spin inside a black hole ? Eventually even the constituent hadrons are getting ripped apart by gravity What is left to spin when even chromodynamics can't exert a tangent to the gravitational centripetal force ? Perhaps past the event horizon, it's still normal matter spinning until it is ripped apart. Does a hungry black hole with no material falling into it still spin ? Also why am I asking so many questions ? Are you all supposed to be smart or something ?
The irony is strong in this one.
They're using beryllium for the plasma facing walls at ITER because of its nuclear properties, as well as its mechanical stiffness. Plasma facing components are exposed to constant neutron bombardment resulting in formation of radioisotopes. Beryllium forms radioisotopes with a short half life (so obviously not 10Be, which is 2+M years, probably 8Be and 7Be) and which have manageable decay paths. The modular shields are replaced when they get too "hot". They are low level waste for 200 years, after which you can put them back in or do whatever else you like to do with beryllium (not breathing it's dust is good). Beryllium can also release a neutron under alpha decay, which is sometimes used in bomb trigger mechanisms. Not sure if that is useful in the tubes. Aluminum is so much cheaper that there would have to be a very good reason not to use it. Maybe it results in a lot of 26Al with a half life of 7.2*10^5 y.