A team of UK scientists has used, for the first time, an extremely short-pulse laser to accelerate high-energy electrons over an incredibly short distance. Current accelerators can be hundreds of metres long, this is just a millimetre long.
Earlier laser-driven accelerators were inefficient, accelerating the electrons to a wide range of energies. But scientists who wish to use these electron beams to research materials science – such as the structure of viruses and moon rock – need the electrons to have the same energy. The team of scientists, led by Imperial College London and including scientists from the CCLRC Rutherford Appleton Laboratory, the University of Strathclyde and University of California, Los Angeles, has shown for the first time that a laser-driven accelerator can produce a beam of electrons with a narrow range of energies. The results of this experiment will be published in Nature on 30 September 2004.
The experiment was performed at the CCLRC Rutherford Appleton Laboratory near Oxford using the Astra laser. This major breakthrough represents a step towards a new technology which promises to be much cheaper and more compact than the conventional approach and in the future could allow individual universities to afford these accelerators instead of relying on large national laboratories.
Jacky Hutchinson | alfa
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The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
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