Unidirectional carbon-carbon (C-C) composite tiles have been designed, manufactured, and tested to be used as thermal imaging diagnostic of high energy particle beam. Tiles intercept the particle beam forming plasma of arrested ions and eroded carbon at the impinging surface. Carbon fiber reinforcement is aligned along tile thickness in order to transfer the thermal pattern from the front to the rear surface. Thermal pattern divergence is limited by the very high thermal conductivity of carbon fiber and pattern aspect ratio is preserved by applying the same manufacturing parameters in any transversal direction. Thermal radiation is detected at the tile rear surface by thermographic cameras producing thermograms correlated to particle beam energy, distribution, and exposure time [1]. Different manufacturers have been involved in the project to develop the unidirectional C-C composite and tile prototypes have been tested. New thermal patterns have been measured on C-C tiles exposed to hydrogen accelerated to produce up to 10 MW/m2 in the Gladis ion beam test facility observing thermal deformations and temperature distribution with maximum value of 800 °C in vacuum [2]. A multiphysics transient non-linear parametric finite element model has been developed to simulate thermal transfer inside tiles, thermal patterns at surfaces, and thermal deformations of tiles varying distribution and peak of specific power. Screening shields have been simulated to investigate experimental effects on tested tiles. Thermal gradients, heat fluxes, and hoop deformations around the applied power density have been analysed and discussed to recognise the tile behaviour. This model has been validated by comparing outputs from analytical calculations and experimental measurements. Then, model geometry and parameters can be changed to extrapolate the behaviour of the full diagnostic with expected specific power up to 20 MW/m2 [3].
Thermal analysis & testing of unidirectional carbon-carbon composite for thermal imaging diagnostic
Dalla Palma Mauro
2017
Abstract
Unidirectional carbon-carbon (C-C) composite tiles have been designed, manufactured, and tested to be used as thermal imaging diagnostic of high energy particle beam. Tiles intercept the particle beam forming plasma of arrested ions and eroded carbon at the impinging surface. Carbon fiber reinforcement is aligned along tile thickness in order to transfer the thermal pattern from the front to the rear surface. Thermal pattern divergence is limited by the very high thermal conductivity of carbon fiber and pattern aspect ratio is preserved by applying the same manufacturing parameters in any transversal direction. Thermal radiation is detected at the tile rear surface by thermographic cameras producing thermograms correlated to particle beam energy, distribution, and exposure time [1]. Different manufacturers have been involved in the project to develop the unidirectional C-C composite and tile prototypes have been tested. New thermal patterns have been measured on C-C tiles exposed to hydrogen accelerated to produce up to 10 MW/m2 in the Gladis ion beam test facility observing thermal deformations and temperature distribution with maximum value of 800 °C in vacuum [2]. A multiphysics transient non-linear parametric finite element model has been developed to simulate thermal transfer inside tiles, thermal patterns at surfaces, and thermal deformations of tiles varying distribution and peak of specific power. Screening shields have been simulated to investigate experimental effects on tested tiles. Thermal gradients, heat fluxes, and hoop deformations around the applied power density have been analysed and discussed to recognise the tile behaviour. This model has been validated by comparing outputs from analytical calculations and experimental measurements. Then, model geometry and parameters can be changed to extrapolate the behaviour of the full diagnostic with expected specific power up to 20 MW/m2 [3].I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.