Nonlinear Observer of the thermal loads applied on the Helium Bath of a Cryogenic Refrigerator. Observer Design and Experimental Validation

François Bonne (1, 2) , Mazen Alamir (1) , Patrick Bonnay (2) , Fanny Clavel (1, 2) , Pawel Majecki (1)

1 GIPSA-SYSCO - GIPSA - Systèmes non linéaires et complexité
2 INAC - Institut Nanosciences et Cryogénie

In this paper, a nonlinear observer of the thermal loads applied to the helium bath of a cryogenic refrigerator is proposed. The thermal loads represents a time-varying thermal disturbance expected to take place in future tokamak refrigerators such as those used in the cooling systems for the International Thermonuclear Experimental Reactor (ITER) or the Japan Torus-60 Super Advanced (JT-60SA). The proposed observer can serve as monitoring tool for cryogenic operators and/or in observer-based advanced control strategies. The observer is based on a part of the nonlinear model of the refrigerator. The paper details the structure of the observer and validates its performance using experimental data.

Domaines: Automatique / Robotique

François Bonne, Mazen Alamir, Patrick Bonnay, Fanny Clavel, Pawel Majecki. Nonlinear Observer of the thermal loads applied on the Helium Bath of a Cryogenic Refrigerator. Observer Design and Experimental Validation. IFAC Joint conference SSSC - 5th Symposium on System Structure and Control, Feb 2013, Grenoble, France. pp.n/c. ⟨hal-00746619⟩