Real-Time data acquisition Prototype proposal of the ITER radial neutron camera and gamma-ray spectrometer

The Radial Neutron Camera (RNC) and the Radial Gamma-Ray Spectrometer (RGRS) are two ITER diagnostics, devoted, respectively, to the Real-Time (RT) measurement of the neutron emissivity profile and to the measurement of the confined alpha profile and runaway electrons. The two systems are closely related as they share the same equatorial port plug and part of the lines-of-sight and both require the acquisition of event-based signals from radiation detectors.The RNC Data Acquisition and Processing (DAQP) system should be capable of handling peak count rates of the order of 106counts per second for a time duration up to 500s. Moreover, for a continuous data throughput, the DAQP system of both diagnostics shall provide two separate DMA channels, capable to transfer simultaneously event-based data and RT processed data from the digitizers to the host. A DAQP prototype will be developed to identify and study critical issues.The present paper will: i) present the RNC DAQP prototype showing its compliancy with the RNC plant system Fast Controller; ii) show the scalability of the actual RNC DAQP from the prototype concept; iii) identify the differences between the RNC and RGRS DAQP needs; iv) describe the RGRS DAQP system and its interface to the ITER Control Data Access and Communication.