P. Espigat

A NEW ANALYSIS METHOD FOR VERY HIGH DEFINITION IMAGING ATMOSPHERIC CHERENKOV TELESCOPES AS APPLIED TO THE CAT TELESCOPE

Abstract A new method of shower-image analysis is presented which appears very powerful as applied to those Cherenkov Imaging Telescopes with very high definition imaging capability. It provides hadron rejection on the basis of a single cut on the image shape, and simultaneously determines the energy of the electromagnetic shower and the position of the shower axis with respect to the detector. The source location is also reconstructed for each individual γ-ray shower, even with one single telescope, so for a point source the hadron rejection can be further improved. As an example, this new method is applied to data from the CAT (Cherenkov Array at Themis) imaging telescope, which has been operational since Autumn, 1996.

Results from the Beam Test of the Engineering Model of the GLAST Large Area Telescope

This paper describes the results of a beam test using the Engineering Model of the GLAST Large Area Telescope, which was installed in a beam of positrons, hadrons and tagged photons at SLAC. The performance of the four subsystems, Anti Coincidence Detector, Silicon Tracker, Calorimeter and Data Acquisition will be described.

CELESTE: an atmospheric Cherenkov telescope for high energy gamma astrophysics

Abstract CELESTE is an atmospheric Cherenkov telescope based on the sampling method which makes use of the de-commissioned THEMIS solar electrical plant in the French Pyrenees. A large (2000 m 2 ) mirror surface area from 40 independent heliostats followed by a secondary optic, a trigger system using analog summing techniques and signal digitization with 1 GHz flash ADCs make possible the detection of cosmic γ-rays down to 30 GeV . This paper provides a detailed technical description of the CELESTE installation.

Prototype tests for the CELESTE solar array gamma-ray telescope

Abstract The CELESTE experiment will be an atmospheric Cherenkov detector designed to bridge the gap in energy sensitivity between current satellite and ground-based gamma-ray telescopes, 20–300xa0GeV. We present test results made at the former solar power plant, Themis, in the French Pyrenees. The tests confirm the viability of using a central tower heliostat array for Cherenkov wavefront sampling.

Conventional readout electronics for superheated superconducting grains — First experimental results

Abstract Complete analysis of the electronics for a superheated superconducting grains detector is presented. The designed electronics readout is presented as a good tool to understand grains transiting signals. First experimental results for very small grains, less than 8 μm size, and transiting time evaluation are presented.

Indium solar neutrino experiment using superconducting grains

In this paper we would like to emphasize the revival of interest for Indium experiment in Europe. Properties of metastable superconducting indium grains are presented and our progress towards making an experiment feasible is reviewed.