Electromagnetic, Thermal, and Strength Analysis of ITER Diagnostic Equipment (2011 to 2013)
Area of expertise:
|Keywords||Thermonuclear reactor, ITER, diagnostic equipment, electromagnetic calculations, thermal calculations, strength calculations, finite elements modelling|
|Programs in use||CATIA, ANSYS|
|Project period||2011-2013 гг.|
ITER (International Thermonuclear Experimental Reactor) is the international thermonuclear experimental reactor project. It is based on the TOKAMAK magnetic plasma confinement concept proposed by Soviet scientists. The ITER story started in 1985 when USSR proposed to develop a next generation TOKAMAK by joining efforts of countries that had significant progress in controlled thermonuclear fusion research. Today, Russian Federation, EU countries, India, China, Republic of Korea, USA and Japan take part in the project resulting in construction of a unique ITER fusion reactor in southern France (Cadarache). Equipment developed for ITER should sustain extremely high heat, electromagnetic, and strength loads. The requirements for the structure often contradict with each other which makes it impossible to satisfy and balance all of them without complex variable computations. Calculations and research related to ITER diagnostic equipment performed by experts from the “Computation Mechanics” laboratory (CompMechLab®) play an integral role in the design process. A special feature of mechanical calculations for ITER is the need to carry out associated tasks in the area of mechanics, thermal conduction and electromagnetism.
Results were presented at two international symposiums:
- 27th Symposium on Fusion Technology (SOFT), 2012, Liege (Belgium) - Dynamic structural analysis of a fast shutter with a pneumatic actuator; Engineering analyses of ITER divertor diagnostic rack design;
Nemov A., Panin A., Borovkov A., Khovayko M., Zhuravskaya E., Krasikov Yu., Biel W., Neubauer O. Dynamic structural analysis of a fast shutter with a pneumatic actuator // Fusion Engineering and Design, 2013, vol. 88, Available online 6 April 2013; doi: 10.1016/j.fusengdes.2013.02.143
Abstract. Fast shutters can play important role for the ITER diagnostics. They protect diagnostic mirrors, especially the first ones closest to the plasma, between measurements, during dwell time and baking. In a nominal mode, as it is assumed, for example, for the ITER upper port plug #3 diagnostics, its shutter stays open ∼1 s and closed ∼21 s. The principal idea of the shutter concept is its ability to make fast transitions between the open and closed positions within fractions of second. A pneumatic actuator produces a pressure force to open or close the shutter.
Due to the fast transient nature of the shutter operation, complicated by the parts’ impact interaction, the FE codes using the explicit time integration scheme have an advantage over the implicit ones. The shutter operation is modelled using the explicit solver. Since the shutter dynamic behavior strongly depends on the actuator flood time, different time profiles of the actuator pressure rise (drop) has been verified, including a fast transient with duration of ∼0.1 s. The results of the implicit and explicit solvers are compared. Their pros and cons are pointed out. The system damping, estimations of energy loss and ways to specify damping in FE models are discussed in the paper.
- 11th International Symposium on Fusion Nuclear Technology - Engineering analyses of ITER divertor Thomson scattering
Modestov V.S., Nemov A.S., Borovkov A.I., Buslakov I.V., Lukin A.V., Kochergin M.M., Mukhin E.E., Litvinov A.E., Koval A.N., Andrew P. Engineering analyses of ITER divertor diagnostic rack design // Fusion Engineering and Design, 2013, vol. 88, Available online 6 April 2013; doi:10.1016/j.fusengdes.2013.02.151
Abstract. The divertor port racks used as a support structure of the divertor Thomson scattering equipment has been carefully analyzed to be consistent with electromagnetic and seismic loads. It follows from the foregoing simulations that namely these analyses demonstrate critical challenges associated with the structure design. Based on the results of the reference structure a modified design of the diagnostic racks is proposed and updated simulation results are given. The results signify a significant improvement over the previous reference layout and the design will be continued towards finalization.