Title :
Multifunction-Timing Card lTTEV2 for CoDaC Systems of Wendelstein 7-X
Author :
Schacht, J. ; Skodzik, J.
Author_Institution :
Max Planck Inst. of Plasma Phys., Greifswald, Germany
Abstract :
The timing system is a crucial element for the Control, Data Acquisition, and Communication (CoDaC) system of the steady-state fusion experiment Wendelstein 7-X (W7-X). Its main task is the synchronization of all clocks with sufficient accuracy. Furthermore, it is able to send, receive, and process event messages. It offers a wide range of time-related functions, e.g., time capturing, pulse generation, realization of time delays, and sending and receiving of trigger signals. The overall timing system consists of a central timing system and a considerable number of local timing systems. A revision of the existing local Trigger Time Event card version (1lTTEV1) card and Time-to-Digital Converter (TDC) card was necessary as many components used for their fabrication were no longer available. The need for a bus interface for the lTTE card with long term availability has led to the decision to use a GBit Ethernet interface. By choosing a more powerful FPGA device, it was possible to increase the time resolution by a factor of two. This contribution starts with a short introduction of the W7-X timing system. The key properties, all extended as well as new features of the lTTEV2 card to face new requirements regarding data acquisition are described. The actual state of the development is given.
Keywords :
data acquisition; field programmable gate arrays; fusion reactor instrumentation; physical instrumentation control; plasma toroidal confinement; stellarators; time-digital conversion; CoDaC systems; FPGA device; GBit Ethernet interface; W7-X timing system; Wendelstein 7-X; clock synchronization; communication system; data acquisition; lTTE card; local Trigger Time Event card version; local timing systems; multifunction-timing card lTTEV2; pulse generation; time capturing; time delays; time-to-digital converter card; trigger signals; Data acquisition; Field programmable gate arrays; Hardware; Random access memory; Registers; Software; Timing; Control and data acquisition; FPGA device; synchronization; timing system; trigger-time-event (TTE) functions;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.2015.2425895
