Analysis Of Three-Dimensional Nuclear Data On A Transputer-Based Multiprocessor System

A prototype for administration and analysis of huge amounts of data, mainly nuclear multiple coincidences, is described. The prototype is implemented on a 100\Gammaunit transputer-based multiprocessor system, Hathi-2. First, the performance of the software is tested on artificially generated three--dimensional data. Then a set of real data is analyzad to estimate the rate of sort that can be performed. The feasibility of using such a system to analyse large nuclear-physics data spaces is discussed. Contents: Page: 1. Introduction: Some Basic Nuclear Physics 2 1.1 Properties of a fl \Gammaray Coincidence Experiment 2 1.2 Multidetector Arrays: NORDBALL 3 2. Principles of the fl \Gamma fl \Gamma fl Analysis 6 2.1 Structure of the Data 6 2.2 Decomposition of the Data Space 7 3. Description of a Transputer and of Hathi-2 8 3.1 The Transputer 8 3.2 The Hathi-2 Multiprocessor System 9 4. Implementation on Hathi-2 10 4.1 Representation of Data 10 4.2 Processes Used 12 4.3 Configuration, ..

Overview of the JET results

Since the installation of an ITER-like wall, the JET programme has focused on the consolidation of ITER design choices and the preparation for ITER operation, with a specific emphasis given to the bulk tungsten melt experiment, which has been crucial for the final decision on the material choice for the day-one tungsten divertor in ITER. Integrated scenarios have been progressed with the re-establishment of long-pulse, high-confinement H-modes by optimizing the magnetic configuration and the use of ICRH to avoid tungsten impurity accumulation. Stationary discharges with detached divertor conditions and small edge localized modes have been demonstrated by nitrogen seeding. The differences in confinement and pedestal behaviour before and after the ITER-like wall installation have been better characterized towards the development of high fusion yield scenarios in DT. Post-mortem analyses of the plasma-facing components have confirmed the previously reported low fuel retention obtained by gas balance and shown that the pattern of deposition within the divertor has changed significantly with respect to the JET carbon wall campaigns due to the absence of thermally activated chemical erosion of beryllium in contrast to carbon. Transport to remote areas is almost absent and two orders of magnitude less material is found in the divertor