NC State Creates Most Powerful Positron Beam Ever 214
eldavojohn writes "A fairly large breakthrough took place earlier this month with the most powerful man-made antimatter electron beam ever being created at North Carolina State University. Professor Hawari who worked on the project explains its benefits: 'The idea here is that if we create this intense beam of antimatter electrons — the complete opposite of the electron, basically — we can then use them in investigating and understanding the new types of materials being used in many applications.'"
Re:Little useful info in TFA (Score:3, Interesting)
Don't cross the beams! (Score:3, Interesting)
Useless without... (Score:3, Interesting)
Re:Don't cross the beams! (Score:3, Interesting)
Naw. It would have to hit something to glow. And it wouldn't be much of a beam with an acceleration voltage in the single-digit volts needed to produce visible light when the electrons slam into something.
As for trying to make a middle-of-the-air display by intersecting electron and positron beams: While half-MeV gamma-ray photons count as "light" they don't count as "visible light" (unless the light is really bright and an unfocused, all-over-the-retina, dying-cell sensation counts as "visible"). They're more than 100,000 times as "ultra" as "ultra-violet".
Re:Jesus Christ in a Chicken Basket (Score:1, Interesting)
Not Quite (Score:5, Interesting)
Re:Jesus Christ in a Chicken Basket (Score:2, Interesting)
(lawyer note: I don't recommend this, you will probably get caught and spend the rest of your life in jail, plus it's just plain a bad idea)
Re:How is the beam manipulated? (Score:3, Interesting)
I used to work at SLAC, and I got to know something about how the whole machine worked and what we (as a member of the team who made it work) were doing. You are 100% correct about beer and bubble chambers. At one time SLAC had a huge bubble chamber filled with liquid hydrogen (as I recall, I could be wrong). They also had a huge cloud chamber, and even a very large spark chamber, and giant solenoid magnets around those chambers, to make charged particles leave curved tracks. Back then, they photographed each pulse of the accelerator as seen in the bubble chamber, the cloud chamber, or the spark chamber (something like 5 to 10 pulses per second) on black and white movie film. They then had teams of people studying those films, frame by frame, looking for "interesting events". I'm sure the folks doing this visual analysis rapidly developed eye strain. I'm also sure the development of the particle detector (as represented by SLD) was a great improvement, both because the experimental machinery could run faster, and because computers could do the data analysis much faster and more accurately than people.
Although I am no longer working for SLAC, I always thought SLAC was a great place to work. There was so much history there that I could see and touch, and I sometimes got to talk with the people who were there when exciting discoveries were made. SLAC was where quarks were first observed in the form of three small (but hard) pits in the middle of a large squishy thing called a proton. They made this discovery by studying the scattering of some high speed electrons shot into a tank of liquid hydrogen. They then shot the same high speed electron beam into a tank of liquid deuterium. Deuterium has one proton and one neutron in its nucleus. To derive what the neutron looked like, they subtracted out what the scattering effect was from liquid hydrogen (which has only a proton in it's nucleus) and from that concluded that neutrons also were large squishy things with three hard pits in the middle, just like protons.
SLAC and the team that performed this high speed electron scattering experiment won a Nobel Prize for their work.
SLAC is also where the quark theory was tested in one of the first storage rings called SPEAR, earning SLAC another Nobel Prize. The Tau particle was found there, too, although the tau had been recorded but not recognized in other places. The discovery of the tau earned SLAC their third Nobel Prize.
While I worked there, my email and newsgroup signature line was, "Nobel Prizes R Us!"
Re:Obligatry (Score:3, Interesting)
I do wish the article gave more information. If someone has some, please post it.