Athanassios Liakopoulos, Basil Maglaris, Christos Bouras, Afrodite Sevasti 1 Department of Electrical & Computer Engineering, National Technical University of Athens (NTUA), 15780 Zografou, Athens, Greece Greek Research and Technology Network (GRNET), 56 Mesogion Ave., 11574, Athens, Greece Department of Computer Engineering and Informatics, University of Patras, 26500 Rion, Patras, Greece Comp...

We have made a basic study of a polarized positron source for the next generation linear collider, JLC[1][2]. This is based on a new idea that polarized positrons are pair-created from polarized γ -rays produced through Compton scattering of circularly polarized laser lights o relativistic electron beams[3][4]. Since a pulse duration of γ -rays thus produced is extremely short i.e. 20 psec, the...

The MUCOOL facility is proposed to examine cooling techniques that could be used in a muon collider. The solenoidal beam channel before and after the cooling test section are instrumented to measure the beam emittance. This instrumentation channel includes a bent solenoid to provide dispersion and time projection chambers to measure the beam variables before and after the bend. The momentum of ...

The GEANT/FLUKA detector simulation and particle interaction package was used to develop a Monte Carlo program to estimate atmospheric secondary ux produced by primary cosmic rays, as a function of depth in the atmosphere. Of special interest is the calculation of secondary electrons and positrons near the top of the atmosphere. The HEAT instrument measured primary and secondary electrons rangi...

We describe R&D results on optical properties of a scintillating tile//ber system for the SDC barrel electromagnetic calorimeter. The tile//ber system uses a wavelength shifting ber to readout the signal of a scintillating plate (tile) and a clear ber to transmit the signal to a phototube. In the SDC calorimeter design, four of tile//ber systems are grouped as a 22 tile package so that the gap ...

A magnetic spectrometer with a relative energy resolution of 5·10 was proposed for ILC beam energy calibration. A complementary method of beam energy measurement based on registration of synchrotron radiation (SR) from the dipole magnets of the energy spectrometer is proposed. Measuring both horizontal edge positions of the SR fan at a distance of 50-70 m downstream of spectrometer allows to de...

Anomaly detection remains a poorly understood area where visual inspection and manual analysis play a significant role in the effectiveness of the detection technique. We observe traffic anomalies in two adjacent networks, namely GEANT and Abilene, in order to determine what parameters impact the detectability and the characteristics of anomalies. We correlate three weeks of traffic and routing...

A new g-tracking method based on the Compton-scattering probability of photons in a spectrometer composed of segmented Ge detectors has been developed and evaluated with the GEANT 3 simulation code. The performance of this probabilistic method, in terms of photopeak detection efficiency and peak-to-total ratio calculated for a 4p array composed of planar detectors, is comparable with the ones o...

A multi-detector array has been constructed for the simultaneous measurement of energyand angular correlation of electron-positron pairs produced in internal pair conversion (IPC) of nuclear transitions up to 18 MeV. The response functions of the individual detectors have been measured with mono-energetic beams of electrons. Experimental results obtained with 1.6 MeV protons on targets containi...