Speakers
Dr
Biswanath SARKAR
(ITER-India, Institute for Plasma Research)
Ritendra Bhattacharya
(ITER-India, Institute for Plasma Research)
Description
The high mass flow rates of supercritical helium necessary to maintain the ITER magnet and cryopump system at nominal operation conditions are generated by the cold circulators of the Cryodistribution system. The requirements for those cold circulators are unique in terms of the high mass flow rate and dynamic operation environment compared to the presently existing and commercially available ones used at 4 K temperature levels. Two full-scale cold circulators are being developed by IHI Corporation, Japan and Barber Nichols Inc., USA to mitigate the technical and schedule risks of the project. Both cold circulators will be integrated into the Test Auxiliary Cold Box (TACB) as per the conceptualized test proposal. The qualification test plan has been developed in compliance with the capacity of the cryogenic test facility at the Japan Atomic Energy Agency consisting of a cryoplant of ~ 5 kW at 4.5 K.
The qualification test involves technical validation of both cold circulators as per the cryogenic operating modes of the ITER toroidal field magnet under a simulated condition. Accordingly, the configuration of TACB has been developed for the integration of two cold circulators including a liquid helium (LHe) thermal buffer, LHe submerged heat exchangers and set of cryogenic valves for precise process management. The modes of operation during the test have been defined as cool-down/warm-up, nominal and 10 % higher speed operation as a function of pressure head variation. Studies have been performed to develop the control methodology of the various test modes using the process simulation to cope with the functional requirement of the test within the operational limits of the test facility. The paper will describe the process modelling, test approach, assumptions involved in the simulation, and results using the control strategies to be implemented during the cold circulator test.
Author
Ritendra Bhattacharya
(ITER-India, Institute for Plasma Research)
Co-authors
Dr
Biswanath SARKAR
(ITER-India, Institute for Plasma Research)
Mr
Chalifour Michel
(ITER Organization)
Mr
Hitensinh Vaghela
(ITER-India, Institute for Plasma Research)
Dr
Hyun-Sik Chang
(ITER Organization)
Dr
Katsumi Kawano
(Japan Atomic Energy Agency)
Minoru Sato
(Japan Atomic Energy Agency)
Mr
Pratik Patel
(ITER-India, Institute for Plasma Research)
Mr
Srinivasa Muralidhara
(ITER-India, Institute for Plasma Research)
Dr
Takaaki Isono
(Japan Atomic Energy Agency)
