Status of a Pulsed-Neutron Logging Probe Using a High-Purity Germanium Detector

Jensen, D.H.; Barnard, R.W.; Bivens, H.M.; Humphreys, D. R.; Weinlein, J. H.; Stephenson, W. A.

doi:10.1109/tns.1983.4332609

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…However, high electromagnetic noise generated during capacitor bank discharge has been an issue in applications that require a high signal-to-noise ratio (S/N) because of its proximity to the plasma focus unit. In addition, the capacitor bank and other associated high-voltage (HV) components of the portable plasma focus devices may not be compatible for use in extreme conditions, such as a neutron probe tool in borehole logging for deep geological surveys to find deep ore deposits and petroleum reservoirs [34,35], as high moisture among other factors severely effects its electrical operation in such conditions.…”

Section: Introductionmentioning

confidence: 99%

Development of a portable pulsed fast ⩾10⁶ neutron generator based on a flexible miniature plasma focus tube

Niranjan

Srivastava

Joycee

et al. 2023

Plasma Phys. Control. Fusion

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Plasma focus is a laboratory fusion device that is used to produce pulsed neutrons for a few tens of ns duration. A compact plasma focus tube (volume ≈ 130 cm3) has been developed and this was connected to a newly developed capacitor bank using twenty four coaxial cables, each 10 m long. The capacitor bank was of compact size and this was consisted of four energy storage capacitors (each 6 µF, 20 kV, size:20 cm × 20 cm × 30 cm). The peak discharge current of the capacitor bank was estimated to be 176 kA with rise time of around 3.6 µs at maximum 4.8 kJ operation energy. The average neutron yield was observed to be maximum (3.1±1.0)×106 neutrons/pulse with pulse duration of 15 to 25 ns at an operation energy of 2.7 kJ (15 kV) and deuterium gas filling pressure of 4 mbar. Long coaxial cables allow only the plasma focus head (neutron source) to be moved as per needs, making this a portable pulsed neutron source useful in many applications including in extreme conditions such as in borehole logging applications for oils and minerals mapping. This report describes the details about various components of this portable neutron generator along with its neutron emission characteristics.

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Section: Introductionmentioning

confidence: 99%