From Off-line to Real-time Analysis: Accelerating Bayesian Analysis Codes
A. Dinklage, Rainer Dieter Fischer, J. Geiger, Georg Kühner, Henning Maassberg, J. Svensson, U. von Toussaint · 2003
Capabilities of real time performance of a Bayesian analysis codes are explored. Background For continuously working fusion devices timely provision of significant physics quantities are desirable for possible interventions in running physics programmes. Typical time scales relevant for control and interventions for the Wendelstein 7-X stellarator are given by MHD fluctuations (¿MHD 10¡3 s), the energy confinement time (¿E 10¡2:::¡1 s) and the plasma current relaxation time (¿L=R 101 s). Both real time control and possibilities for human interaction may benefit from such a fast analysis. The term ’real-time analysis’ refers to the usual timeliness condition for the completion of analysis here ¿A ¿ ¿L=R allowing for a synchronous operation of analysis procedures and a sufficiently high repetition rate of analyzes. Possibilities for the acceleration of data analysis codes with focus on such a continuously working data analysis techniques are discussed, such as parallelization. Additional emphasis is led on the real-time provision of significance measures. The required analysis time of codes based on Bayesian models of diagnostics is discussed in figures