The ITER project requires additional heating via injection of neutral beams, provided by two injectors accelerating negative ions. To study and optimise negative ion production, the SPIDER prototype is under construction in Padova, whose beam has an energy of 100keV and a current of 50A. The instrumented calorimeter STRIKE (Short-Time Retractable Instrumented Kalorimeter Experiment) has been developed with the main purpose of characterising the SPIDER negative ion beam in terms of beam uniformity and beam divergence during short pulse operations (several seconds). STRIKE is made of 16 1D Carbon Fibre Composite (CFC) tiles, intercepting the whole beam and observed on the rear side by infrared (IR) cameras. Prototypes of the CFC material were procured and this contribution presents experimental tests and numerical simulations devoted to the characterisation of the CFC properties and to the assessment of the performance of the diagnostic. Tests are described, performed using a CO 2 laser to investigate the spatial resolution of the diagnostic on the scale lengths and with the experimental layout expected in SPIDER. Data recorded by an IR camera during the experiments are compared with simulations aiming to reproducing the experimental data with the purpose of validating the thermal parameters of CFC.
Thermal Simulations of STRIKE tiles for the assessment of the CFC prototypes and of the configuration for SPIDER
Serianni G;Pasqualotto R;Cervaro V;Dalla Palma M;
2013
Abstract
The ITER project requires additional heating via injection of neutral beams, provided by two injectors accelerating negative ions. To study and optimise negative ion production, the SPIDER prototype is under construction in Padova, whose beam has an energy of 100keV and a current of 50A. The instrumented calorimeter STRIKE (Short-Time Retractable Instrumented Kalorimeter Experiment) has been developed with the main purpose of characterising the SPIDER negative ion beam in terms of beam uniformity and beam divergence during short pulse operations (several seconds). STRIKE is made of 16 1D Carbon Fibre Composite (CFC) tiles, intercepting the whole beam and observed on the rear side by infrared (IR) cameras. Prototypes of the CFC material were procured and this contribution presents experimental tests and numerical simulations devoted to the characterisation of the CFC properties and to the assessment of the performance of the diagnostic. Tests are described, performed using a CO 2 laser to investigate the spatial resolution of the diagnostic on the scale lengths and with the experimental layout expected in SPIDER. Data recorded by an IR camera during the experiments are compared with simulations aiming to reproducing the experimental data with the purpose of validating the thermal parameters of CFC.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
