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A new set of Heavy Ion Beam Probe diagnostic (HIBP-2) was recently installed in the TJ-II stellarator. HIBP-2 is being operated simultaneously with the previously existing HIBP-1 to provide the coherence data analysis aiming for the 3D studies of the Long-Range Correlations and Alfvenic Eigenmodes. A new Control and Data Acquisition System (CDAS) of high performance and high reliability has been made to operate HIBP-2. The CDAS of HIBP-1 is being upgraded to a similar configuration. The distributed architecture implementing a client–server model provides flexibility and system scalability. The developed CDAS has shown reliable operation of dual HIBP. This paper describes the CDAS of this dual diagnostics. [ABSTRACT FROM AUTHOR]

Abstract: A new technique for gas determination in the thermal decomposition of graphite nitrate II–IV stages has been reported. Its correctness was confirmed by thermogravimetry and infrared spectroscopy. Static and dynamic modes of the decomposition were examined. Firstly, the static mode was carried out in three atmospheres: (1) oxidizing – air; (2) argon – inert; (3) reducing – methane (4vol%) and argon. A detailed analysis of the evolved gases is presented. The composition of these gases was found to depend on graphite nitrate stage number and the atmosphere in which it was expanded. Following the static mode, the dynamic mode was carried out in the argon atmosphere only. Two-stages of gas evolution with increasing temperature were registered within the dynamic mode. The same two-stage effect was observed on the thermogravimetry curves and infrared spectra. Based on the results obtained from the dynamic mode, chemical reactions occurring in the thermal decomposition have been proposed. [Copyright &y& Elsevier]