Timur Delahaye is one of the OKC fellows working at the Cosmology, Particle astrophysics and String theory group (CoPS) since this summer. Lets get to know him better.
The Alpha Magnetic Spectrometer (AMS) collaboration announced its first physics result in Physical Review Letters on 3 April 2013. This was a long awaited event for the astroparticle physics community. Indeed, this large particle detector was first proposed by Nobel laureate Samuel Ting in 1994, to study primordial cosmic-ray particles in the energy range from 0.5 to 2 TeV. A proof-of-principle spectrometer (AMS-01) flew successfully for 10 days on the space shuttle Discovery during flight STS-91 in June 1998.
Particles with TeV energies, like those produced at the LHC, seem exotic. But once outside the protection of our atmosphere, these “cosmic rays” (CR) become exceedingly common. The Fermi Telescope, for example, encounters a hundred thousand CR for every gamma ray it detects. These particles have an impressive scope of local effects, from damaging electronics and inhibiting manned space travel to possibly triggering lightning strikes. And although we have been aware of their existence since the early 1900ʼs, their exact origins remained unclear.
The past year, 2012 has been the hundredth anniversary of the discovery of the cosmic-rays by Viktor Hess. It was also the tenth anniversary of the High Energy Stereoscopic System, in short H.E.S.S., named after him and last but not least 2012 also marked the start of the second phase of the experiment with the inauguration in September of a fifth and much larger telescope.
It was 1912, when Viktor Hess performed several flights in air balloon, and discovered the extra-terrestrial origin of ionizing particles bombarding the Earth. The cosmic-rays were discovered. Since then, they have attract attention of a large community of scientists: physicists, astrophysicists and astronomers. A new field of research, astro-particle physics, emerged, spanning several orders of magnitude both in energy and particle rate, with the aim of studying their origin and properties.
Antje Putze is an Oskar Klein Fellow since october 2009. She is working in cosmic-ray physics and indirect dark matter detection.
You have been an Oskar Klein Fellow for more than 2 year, how is it going so far?
I am very much enjoying working at the OKC. In particular, the inspirational atmosphere within the centre is very fruitful for my work. I adjusted easily to the Swedish climate (especially the short winter days) and I love living in Stockholm.