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The new powerful VME–based data acquisition (DAQ) system has been designed for the Deuteron Spin Structure setup [1] placed at the Nuclotron Internal Target Station [2]. The DAQ system is built using the netgraph–based data acquisition and processing framework  ngdp  [3, 4]. The software dealing with VME hardware is a set of  netgraph  nodes in the form of the loadable kernel modules. The specific for current implementation nodes are described, while specific software utilities for the user context are the following. The  b2r  (binary–to– ROOT ) server converts raw data into per trigger and per accelerator spill representations, which are based on C++ classes derived from the  ROOT  framework [5] ones. This approach allows us to generalize the code for histograms filling and polarization calculations. The  b2r  optionally stores  ROOT  events as  ROOT  TTree in file(s) on HDD, and supports the design of some express offine. The  histGUI  software module provides an interactive online access for human operator to histograms filled by the  r2h  ( ROOT –to–histograms) server, which obtains the  ROOT  event representations from  b2r . The  r2h  supports the calculation and histograming of runtime configurable variables as well as raw data variables, and optionally stores  ROOT  histograms in file(s) on HDD. Since the spin studies at the Nuclotron require fast and precise determination of the deuteron and proton beam polarization, the polarization calculator software module is introduced. This calculator based on runtime configurable  r2h  code allows us to compute polarization values online and integrate them into the Web–based scheme of representation and control of the polarimeters [6, 7].

VME–based DAQ system for the Deuteron Spin Structure setup at the Nuclotron internal target station