5-9 September 2016
Prague Congress Centre
Europe/Prague timezone

P1.029 Coupled thermal-hydraulic and thermal-mechanical analysis of a 1MW gyrotron cavity cooled by mini-channels

5 Sep 2016, 14:20
1h 40m
Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Foyer 2A (2nd floor), 3A (3rd floor)

Prague Congress Centre

5. května 65, Prague, Czech Republic
Board: 29
Poster B. Plasma Heating and Current Drive P1 Poster session

Speaker

Andrea Bertinetti (Politecnico di Torino)

Description

During operation, the resonance cavity of a high power gyrotron experiences a very large heat load (>15 MW/m2), localized on a very short ( < 1 cm) length, where any thermal deformation should be carefully controlled to guarantee the gyrotron performance. Different strategies can be considered for the removal of the heat there, among which we focus here on the use of mini-channels drilled in the annular region around the cavity.A mock-up of such a cavity has been designed, fabricated and tested at the FE200 electron beam test facility of AREVA with the double objective of checking the cooling performance and acquiring experimental data to validate/calibrate the 3D computational analysis, which was performed using the commercial software STARCCM+, especially as far as the turbulence and the boiling models are concerned. The temperature distribution on the heated surface and the temperature of the solid structure on the inner part of the mock-up assembly are measured during the tests by an infra-red camera and by a set of thermocouples, respectively, and compared to the computed values.The numerical model, after its calibration, is applied to the analysis of a 1 MW gyrotron cavity in nominal operation. The thermal behavior of the cavity under nominal heat load is computed, assuming a tentative deformation of the cavity. Then a 3D thermo-mechanical model of the cavity is developed, and simulations are performed, based on the temperature maps computed by the thermal-hydraulic analysis, to evaluate the resulting deformation of the inner cavity surface. The deformation is used in turn to re-assess the heat load coming from the electron beam in nominal operation, which becomes the input for a new iteration of the thermal-hydraulic and thermal-mechanical analysis, until the requested tolerance/accuracy has been reached.

Co-authors

Andrea Bertinetti (Politecnico di Torino, Torino, Italy) Fabio Cismondi (EUROfusion, Garching, Germany) Ferran Albajar (Fusion for Energy, Barcelona, Spain) Francesca Cau (Fusion for Energy, Barcelona, Spain) Konstantinos Avramidis (Karlsruhe Institute of Technology, Karlsruhe, Germany) Laura Savoldi (Politecnico di Torino, Torino, Italy) Roberto Zanino (Politecnico di Torino, Torino, Italy) Yoann Rozier (Thales Electron Devices, Vélizy-Villacoublay, France)

Presentation Materials

There are no materials yet.