Université de Genève
Ecole de physique - Département de physique nucléaire et corspusculaire
24, quai Ernest-Ansermet - 1211 GENÈVE 4
Tél: (022) 379 62 73 - Fax: (022) 379 69 92
Lundi 8 décembre 2008
PARTICLE PHYSICS SEMINAR
at 17.00 hrs – Stückelberg Auditorium
The Galaxy in a new light: High energy gamma ray astronomy with H.E.S.S.
Prof. Werner Hofmann / MPI für Kernphysik, Heidelberg
During its first years of operation, the H.E.S.S. array of imaging atmospheric Cherenkov telescopes has revealed a sky full of sources of very high energy gamma rays and has demonstrated the great power of the Cherenkov technique for exploring non-thermal processes in the Universe. High-energy gamma ray astronomy is now delivering sky maps, sources with resolved morphology, and high-resolution light curves, joining up with mainstream astronomy. The talk will illustrate some of the key results from H.E.S.S., mention some of the open questions, and present ideas for the next-generation CTA observatory.
Organizer : Prof. Markus Büttiker
Wednesday 10 December 2008
PARTICLE PHYSICS SEMINAR
at 17.00 hrs – Stückelberg Auditorium
Kinematics at Hadron Colliders
by Prof. Drew Baden / University of Maryland
I will review the kinematics of hadron collisions, especially relevant on the eve of the LHC startup. A variety of topics will be covered, meant to be useful for those not familiar with the origins and details of these considerations.
Organizer : J.-S. Graulich
Wednesday 17 décembre 2008
PARTICLE PHYSICS SEMINAR
at 17.00 hrs – Stückelberg Auditorium
Bent crystals: a long story and its new frontiers
by Dr Michela Prest / Universita degli Studi dell’Insubria, sede di Como
When a particle physicist hears the world "crystal", he usually thinks of calorimeters, silicon detectors, a state of matter. When he hears the word "magnet", he thinks of bulky, heavy objects. In 1976, E. H. Tsyganov experimentally demonstrated how a bent crystal 1 mm thick, a couple of mm wide and a few cm high can steer particles as a dipole of several tens of Tesla. Crystals and the channelling phenomena have been studied for around 30 years. Hadron beam collimation has been immediately identified as their main application and the understanding of the physics of crystals and their experimental study have proceeded in parallel, discovering new phenomena and requiring new technological achievements. This seminar describes the role of bent crystals in collimation in general and for the second phase of LHC in particular giving an insight of the physics of crystals. It will also revise the topic of radiation production by light particles in bent crystals which is still an open field both from the theoretical and experimental points of view and which would be a real breakthrough in several fields, from the production of positron sources for the Linear Collider to the generation of intense gamma beams for medical applications."
Organizer : J.-S. Graulich
Information: http://dpnc.unige.ch/seminaire/annonce.html