Abstract
The Divertor nuclear flux monitor (DNFM) is one of the ITER neutron diagnostics. This diagnostic consists of the three same subsystems. Each subsystem concludes the detector module with fission chambers (FCs) and the data acquisition system (DAQ). To solve the task of the neutron flux measurements in the range of 7 orders of magnitude and 1 ms of time resolution the multidetector module is used. To confirm the possibility of the neutron flux measurements in a wide range using such a detector module and to evaluate the characteristics of the DAQ prototype a number of tests were carried out under conditions of the intense neutron radiation. The detector module and the DAQ, which are the prototype of the equipment planned for use on site were used for the tests. The tests were carried out at the plasma neutron diagnostic stand based on the NG-24M neutron generator and at the IBR-2 pulsed reactor of the Joint Institute for Nuclear Research. During the tests at the plasma neutron diagnostic stand the data for the calibration of the DNFM DAQ measuring channels were collected. During the tests at the IBR-2 pulsed reactor the signals from the measuring channels of the DNFM subsystem were obtained while the neutron flux was changed. This report shows the test results and the subsystem calibration techniques.
Highlights
THE neutron diagnostic “Divertor neutron flux monitor” (DNFM) is one of the instruments to determine the neutron yield and the thermonuclear power of the International thermonuclear experimental reactor ITER
To increase the dynamic range of the neutron flux measurements using one fission chambers (FCs) the data acquisition system processes the signal from each chamber with four methods: pulse counting, fluctuation (MSV, Campbelling), current, and pulse-fluctuation
The DNFM data acquisition system (DAQ) prototype tests with mockups of detector units were carried out at the neutron diagnostics stand of plasma of the JSC "SSC RF TRINITY"
Summary
THE neutron diagnostic “Divertor neutron flux monitor” (DNFM) is one of the instruments to determine the neutron yield and the thermonuclear power of the International thermonuclear experimental reactor ITER. The neutron flux measurements should be provided with 1 ms of time resolution and 10 % of uncertainty. To meet these requirements the multidetector module consists of six FCs with different sensitivities and the DAQ system processed FCs signals with different methods is used. At the first stage the DAQ system prototype was manufactured With this prototype the software for measuring and diagnostic procedures was checked and validated [1]. The stage of the DNFM neutron diagnostic research and developing was field testing of the DAQ system prototype with the detector module mockup. The first aim of tests was to check the operation parameters of the DNFM subsystem under the conditions of neutron and gamma radiation. The second aim was to obtain the data to validate the methods and techniques of the calibration and combination of the measurement chains of each measurement channel taking into account the FC parameters
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