532 



53 



4.3 Diagnostics 



- Active phase diagnostics 



During either DT or DD operation at high neutron fluences the use of 

 conventional diagnostics will encounter difficulties due to activation 

 of the structures, to remote operation, to degradation of component 

 lifetime, etc. .,. Also, diagnostics related to alpha-particles will 

 play a major role in the understanding of the physics of the active 

 phase; such measurements are particularly delicate by nature and their 

 interpretation requires a great deal of theoretical and computational 

 effort. 



Both the developments of new diagnostics specific of the active 

 operation and the hardening of existing diagnostics will require in the 

 near future substantial efforts which could he divided between 

 interested laboratories. These developments are essential for the 

 exploitation of JET and TFTR; they will also be of use in Tokamak of 

 intermediate size working in Deuterium at high temperature. 



4.4 Computer codes 



During recent years computer codes have become a powerful tool for 

 describing the behavior of magnetically confined plasmas. The 

 organization of voluminous codes in specialized packages, which could 

 be designed and tested by various partners whereas the full codes could 

 be made available to al 1 , is well suited for international 

 collaboration. The comparison of code analysis and the development of 

 plasma modelling In various physical situations would also benefit from 

 enhanced coordination. A data link to ease this coordination might be a 

 necessary prerequisite. 



4.5 Large Tokamak experiments 



Cooperation between large Tokamak programmes is an essential issue. It 

 is already In progress on an Informal basis. The conclusion of the 

 current negotiations of the lEA Implementing Agreement will give a 

 stronger basis to this cooperation. 



4.6 Exchange of information and personnel 



Of comparable importance to the formal cooperative actions are the 

 opportunities for the exchange of information and personnel between 

 specific programmes. These activities strengthen working 

 relationships between individual researchers and foster the spirit of 

 cooperation essential to the more substantial cooperative 

 undertakings on major new facilities and projects. The various 

 agreements presently under negotiation will constitute the proper frame 

 for organizing such exchanges. 



