Scientific Seminars and Workshops

Future Physics at COMPASS.

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Future Physics at COMPASS.

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Future Physics at COMPASS.

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A theory with such mathematical beauty cannot be wrong: this is one of the main arguments in favour of string theory, which unifies all known physical theories of fundamental interactions in a single coherent description of the universe. But no one has ever observed strings, not even indirectly, nor the space of extra dimensions where they live. However there are good reasons to believe that the 'hidden' dimensions of string theory may be much larger than what we thought in the past and that they may be within experimental reach in the near future - together with the strings themselves. In my talk, I will give an elementary introduction of string theory and describe the main experimental predictions.

Organiser(s): Jasper Kirkby / EP Division

Note: Tea & coffee will be served at 16.00 hrs..

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HCAL Status.

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Physics Plenary.

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11:00	Coffee
11:30	DELPHI	John Holt /CERN
12:00	L3	Arno Straessner /CERN
12:30	Lunch
14:00	OPAL	Richard Hawkings /CERN
14:30	ALEPH	Stephane Jezequel /Annecy
15:00	QCD working group report	Roger Jones /Lancaster
15:20	Status of the energy calibration	Guy Wilkinson /Oxford
15:35	All that theories can tell us is how the world could be	Giampiero Passarino /Torino

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Organiser(s): Jasper Kirkby / EP Division.

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Our future deep-space exploration faces many daunting challenges, but three of them loom high above the rest: physiological debilitation, radiation sickness and psychological stress. Many measures are presently being developed to reduce these difficulties. However, in the long run, two important new developments are required: abundant supply of power, and advanced space propulsion. The future looks bright, however. While the road is a long one, it is now well defined and many exciting explorations are within near-term reach.

Biography
Dr. Chang-Diaz graduated from MIT in the field of applied plasma physics and fusion research. He has been a NASA space shuttle astronaut on seven missions between 1986 and 2002. As director of the ASP Laboratory in Houston, he continues research on plasma rockets.
For more details: see
www.jsc.nasa.gov/Bios/htmlbios/chang.html

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Celebrating CERN's discoveries and looking into the future.

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The seminar will cover the major results and issues presented at the Lepton Photon Conference, held at Fermilab in August 2003.

Organiser(s): Rolf Landua / EP Division

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A few years ago, "the Grid" was just a vision dreamt up by some computer scientists who wanted to share processor power and data storage capacity between computers around the world - in much the same way as today's Web shares information seamlessly between millions of computers. Today, Grid technology is a huge enterprise, involving hundreds of software engineers, and generating exciting opportunities for industry. "Computing on demand", "utility computing", "web services", and "virtualisation" are just a few of the buzzwords in the IT industry today that are intimately connected to the development of Grid technology. For this third First Tuesday @CERN, the panel will survey some of the latest major breakthroughs in building international computer Grids for science. It will also provide a snapshot of Grid-related industrial activities, with contributions from both major players in the IT sector as well as emerging Grid technology start-ups..

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There are issues encountered in high performance storage systems that normally lead to compromises in architecture. Compute clusters tend to have compute phases followed by an I/O phase that must move data from the entire cluster in one operation. That data may then be shared by a large number of clients creating unpredictable read and write patterns. In some cases the aggregate performance of a server cluster must exceed 100 GB/s to minimize the time required for the I/O cycle thus maximizing compute availability. Accessing the same content from multiple points in a shared file system leads to the classical problems of data "hot spots" on the disk drive side and access collisions on the data connectivity side. The traditional method for increasing apparent bandwidth usually includes data replication which is costly in both storage and management. Scaling a model that includes replicated data presents additional management challenges as capacity and bandwidth expand asymmetrically while the system is scaled. In some cases, systems must also be designed for minimum acceptable bandwidths in the case of a subsystem failure such as a disk drive or data channel leading to increased hardware and management costs. An architectural model will be presented that is in use today in demanding high performance shared access environments. This architecture allows simultaneous data access requiring high bandwidths without the use of data replication. Data can be shared in dynamic multiple path environments allowing for multiple point simultaneous data analysis without a concern for data "hot spots". Further benefits include online scalability where bandwidth and capacity scale linearly as the system is expanded. Additionally, planning for subsystem failures is greatly simplified since the system throughput is maintained regardless ofsystem status. An object based file system will also be presented that is highly scalable and can take full advantage of the hardware architecture. The future roadmap of both the hardware and software will be discussed including block level interfaces that will improve data movement efficiency through the server layer. Biography Dave Fellinger is the Chief Technical Officer at DataDirect Networks, Inc., the world's leading provider of networked storage and cluster solutions for High Performance Computing. Mr. Fellinger has positioned DataDirect Networks solutions in 15 of the world's top 20 HPC systems including Lawrence Livermore National Labs, Sandia National Labs, NCSA, NASA Goddard, Lawrence Berkeley National Labs, Argonne National Laboratory, US Army Research Lab, NOAA Forecast Systems Lab, NCAR, and DKRZ. Mr. Fellinger was a member of "Distributed Lustre File System Demonstration" team that won the "Both Direction Award" at the fourth annual High Performance Bandwidth Challenge held at SC2003 in Phoenix, Arizona. Mr. Fellinger attended Carnegie-Mellon University (Electrical Engineering and Physics) and holds numerous electrical engineering patents..

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