While the general principles of high-energy neutrino detection have been understood for many years, the deep, remote geographical locations of suitable detector sites have challenged the ingenuity of experimentalists, who have confronted unusual deployment, calibration, and robustness issues. Two high energy neutrino programs are now operating (Baikal and AMANDA), with the expectation of usheri...

I give a brief discussion of possible sources of high energy neutrinos of astrophysical origin over the energy range from ∼ 10 12 eV to ∼ 10 25 eV. In particular I shall review predictions of the diffuse neutrino intensity. Neutrinos from interactions of galactic cosmic rays with interstellar matter are guaranteed, and the intensity can be reliably predicted to within a factor of 2. Somewhat le...

After introducing the subject or shielding high energy accelerators, point source, line-of-sight models, and in particular the Moyer Model, are discussed. Their use in the shielding of proton and electron accelerators is demonstrated and their limitations noted, especially in relation to shielding in the forward direction provided by large, flat walls. The limitations of reducing problems to th...

The previous sessions have borne witness to the fact &at high energy accelerator and storage ring technology is a.subject of continuing vitality. Nothing dramatizes this more convincingly than the chart (Fig. 1) which shows the growth in energy of the world’s accelerators in time. If one includes in this chart the equivalent laboratory energy of existing and projected colliding beam storage rin...

The Nautilus Project was started in 1995 as a joint USIsrael feasibility study for using laser systems to defend against short-range artillery rockets. It has now matured into a successful laser weapon demonstration program – the Tactical High Energy Laser (THEL) Advanced Concept Technology Demonstration (ACTD) Program. By now the THEL Demonstrator has engaged and destroyed a large number of ar...

High energy neutrinos with energy typically greater than tens of thousands of GeV may originate from several astrophysical sources. The sources may include, for instance, our galaxy, the active centers of nearby galaxies, as well as possibly the distant sites of gamma ray bursts. I briefly review some aspects of production and propagation as well as prospects for observations of these high ener...

In this paper we compare the results of the MACRO detector at Gran Sasso, that is the largest neutrino telescope operated before the year 2k, with theoretical predictions of the neutrino emission from some promising targets, such as blazars and GRB's. In particular we propose a new statistical method, justified by the maximum entropy principle, for assessing a model independent upper limit to t...

Our knowledge of the high-energy universe will change dramatically over the next several years as new astronomical detectors of high-energy radiation reach their design sensitivities. Besides Swift and HESS, which are already making important discoveries, these include the ground-based imaging air-Cherenkov telescopes VERITAS and MAGIC, the γ-ray space telescopes GLAST and AGILE, and the partic...