A. R. Milosavljević

 

Programming - AQUGRA

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·         AQUGRA is a program for controlling of an experiment and data acquisition, through a “National Instruments” multifunctional I/O board attached to a PC. The program controls different measurement modes, such as electron energy loss, differential cross section measurements, excitation function measurements … The program uses an internal clock (on the NI board) and an original algorithm to ensure a very precise measurement of counting rates, which is tested by a commercial pulse-source. Several output voltages can be controlled simultaneously through the D/A converter on the board, each of them independently, by a given function. A number of different parameters - such as the pressure, the electrode bias voltages, angular position of the electron gun - are acquired simultaneously at each measured experimental point and stored in a matrix that can be exported as an ASCII file. The experimental parameters and data matrix can be saved at any time and loaded again after. The program allows on-line monitoring of several chosen dependences (counting rate versus: impact energy, retarding potential, pressure, scattering angle) during data acquisition, with a very sophisticated graphical user interface (type of scale, plot details, colours, …). The program allows an on-line extracting of a noise signal.

·         The source code (C++) can be easily adapted for a new type of experimental procedure, additional devices or even different type of the I/O board.  

·         Requirements: Windows XP, installed National Instruments NI-DAQ 7.1

·         The program is developed in the Laboratory for Atomic Collision Processes, Institute of Physics Belgrade, by Dr Stojan Madžunkov as a leading programmer, and Aleksandar R. Milosavljević.

·         Acknowledgements: The AQUGRA project is performed under the supervision of Dr Bratislav Marinković and was supported by MNZZS of Republic of Serbia. We are very grateful to Vladimir Samara from Gaseous Electronics Laboratory, Institute of Physics Belgrade, for his help in developing the source for AQUGRA counter.