DENEX Detektoren für Neutronen GmbH
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»   Principle of Operation

The DNX-detector is a two-dimensional spatial sensitive Multi-Wire-Proportional-Counter. Strong and nearly homogeneous electric fields (red arrows) will be generated between the electrodes caused by applied voltages. If, for example, a neutron will be absorbed in the detection volume, the electrons released by ionisation, will be accelerated towards the anode (blue arrows).

The charge impact originated by an electron avalanche on the anode will influence two electric impulses (green arrows)in both cathode wires (X and Y cathode). Each delayline will split the input impulse in two equally strong pulses. The latter flow out at both ends of the delayline. The delaylines consist of an array of LC elements which lead to a delaytime of about 2.7 ns for both pulses between two adjacent cathode wires.

The more the distance from an end of a delayline an impulse is generated, the more the time is required, until it is observed at this end of the delayline. Finally, the arrival times of both impulses lead to the detection point in X and Y direction.
Fig.1: Principle of the spatial recognition in 2D-Multi-Wire Proportional Detector with delay management
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