Utilisation and Reliability of High Power Proton Accelerators
Workshop Proceedings, Daejeon, Republic of Korea, 16-19 May 2004
Accelerator-driven systems (ADS) are being considered for their potential use in the transmutation of radioactive waste. The performance of such hybrid nuclear systems depends to a large extent on the specification and reliability of high power accelerators, as well as the integration of the accelerator with spallation targets and sub-critical systems. At present, much R&D work is still required in order to demonstrate the desired capability of the system as a whole.
Accelerator scientists and reactor physicists from around the world gathered at an NEA workshop to discuss issues of common interest and to present the most recent achievements in their research. Discussions focused on accelerator reliability; target, window and coolant technology; sub-critical system design and ADS simulations; safety and control of ADS; and ADS experiments and test facilities. These proceedings contain the technical papers presented at the workshop as well as summaries of the working group discussions held. They will be of particular interest to scientists working on ADS development as well as on radioactive waste management issues in general.
Methods and Codes for Estimation of Tolerance
Agence pour l'Energie Nucléaire
Successful development of a reliable and normal hands-on maintainable high-power linac requires minimisation of beam losses along the accelerator. The high sensitivity of the high-power linac focusing channel to random perturbation encourages designers to concentrate their attention on the tolerance estimation problem. The degradation of beam parameters, including transverse size and emittance growth, is caused by channel and beam parameter perturbations. The calculation of channel sensitivity permits to estimate the influence of each perturbing factor on the beam parameters and to determine the main source of perturbation, to find perturbing factors compensation possibilities and to determine the factors required to guarantee beam passage throughout the real channel without losses. Methods for the estimation of tolerance in high-power linac accelerating-focusing channels are considered in the present paper. The realisation of these methods in the LIDOS code package is presented. Monte Carlo simulation results for various types of accelerating channels are discussed.