On the fission chamber pulse charge acquisition and interpretation at MINERVE

Loiseau, Patrice; Geslot, B.; André, J.

doi:10.1016/j.nima.2012.11.179

Cited by 5 publications

(4 citation statements)

References 21 publications

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“…The 239 Pu fission chamber was fixed at the same position at four measurements, with a high voltage of 210 V, and the critical assembly operating at 180 W. The 239 Pu fission fragments spectra were recorded by MCA. (a) the fission reaction rate of the naked 239 Pu fission chamber was measured; (b) the reaction rate of the 239 Pu fission chamber with a 0.5 mm thick Cd cover was measured; and (c) the reaction rate of the 239 Pu fission chamber with 10 B cover was measured. The length of 10 B cover is 100 mm,with the hollow length, the inner diameter and the outer diameter being 85 mm, 10 mm and 40 mm respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The fission chamber current pulse depends on specifications such as the filling gas pressure and the fission chamber geometry [10]. 0.168mg 239 Pu is uniformly plated on a foil surface with a length of 10mm and a width of 13.8mm in the fission chamber filled with 4.0×10 5 Pa Argon.…”

Section: Detector Systemmentioning

confidence: 99%

“…The measuring system consists of a 239 Pu fission chamber, a preamplifier, a linear amplifier, and a multichannel pulse analyzer. The fission chamber current pulse depends on specifications such as the filling gas pressure and the fission chamber geometry [10]. In the fission chamber, 0.168 mg 239 Pu is uniformly plated on a foil surface with a length of 10 mm and a width of 13.8 mm filled with 4.0×10 5 Pa argon.…”

Section: Detector Systemmentioning

confidence: 99%

See 2 more Smart Citations

Influence of thermal and resonance neutron on fast neutron flux measurement by ²³⁹ Pu fission chamber

Zeng¹,

Wang²,

Lingli³

et al. 2015

Chinese Phys. C

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Abstract:The 239 Pu fission chambers are widely used to measure fission spectrum neutron flux due to a flat response to fast neutrons. However, in the mean time the resonance and thermal neutrons can cause a significant influence on the measurement if they are moderated, which could be eliminated by using 10 B and Cd covers. At a column enriched uranium fast neutron critical assembly, the fission reaction rates of 239 Pu are measured as 1.791×10 -16 , 2.350×10 -16 and 1.385×10 -15 per second for 15mm thick 10 B cover, 0.5mm thick Cd cover, and no cover respectively. While the fission reaction rate of 239 Pu is rapidly increased to 2.569×10 -14 for a 20mm thick polythene covering fission chamber. The average 239 Pu fission cross-section of thermal and resonance neutrons is calculated to be 500b and 24.95b with the assumption of 1/v and 1/E spectra respectively, then thermal, resonance and fast neutron flux are achieved to be 2.30×10 6 , 2.24×10 6 and 1.04×10 8 cm -2 ·s -1 .

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Section: Methodsmentioning

confidence: 99%

Section: Detector Systemmentioning

confidence: 99%

Section: Detector Systemmentioning

confidence: 99%

See 1 more Smart Citation

Influence of thermal and resonance neutron on fast neutron flux measurement by ²³⁹ Pu fission chamber

Zeng¹,

Wang²,

Lingli³

et al. 2015

Chinese Phys. C

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“…This parameter characterizes the chamber response to neutron detection. This experimental study has been made after a theoretical work to simulate fission chamber pulse signals [1].…”

Section: Introductionmentioning

confidence: 99%

Impact of gas pressure on fission chamber sensitivity in Campbelling mode

Geslot

Loiseau

Lanaute

et al. 2013

2013 3rd International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and Their Applications (ANIMM

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The study presented in this paper is based on measurements conducted in the MINERVE zero power reactor operated at CEA Cadarache with a CEA-made U-235 miniature fission chamber (8 mm in diameter) and obtained in both pulse and Campbelling modes. Our objective was to investigate the impact of the filling gas mixture and pressure on each operating mode, using the capacity of the chamber to be refilled with gas. Three gas mixtures were tested (pure Ar, Ar+4%N2 and Ar+10%CH4) with pressure ranging from 1 to 9 bars. The Mean Fission Product Charge (MFPC), which is the mean charge deposited in the gas by fission products, was obtained from pulse mode signals for each detector setting. It is shown the MFPC is another key parameter to optimize the detector neutron sensitivity, after the fissile coating cross section. Campbelling mode signal was acquired with the Fast Neutron Detector System (FNDS) recently developed by CEA and SCK•CEN.Interesting results were obtained which improve our knowledge of the detector operation. Firstly, it was found that the measurements obtained in both modes are very consistent. The MFPC as a function of the gas pressure was found to be not monotonic. Instead, it features a maximum between 3 and 4 bars. This behavior is expected if the detector does not operate in saturation regime. Indeed, our standard voltage bias of 300 V appeared to be not high enough so that the saturation regime is established. Saturation curves measured in Campbelling mode were fitted using a detector modeling in order to extrapolate the saturation regime MFPC, which came to be independent from the gas. Secondly, obtained results show that the measuring range in Campbelling mode with this detector starts from fission rates as low as a few thousand counts per second. So the so called overlapping range, in which both pulse and Campbelling modes are usable, is about one decade with our spectroscopy modules and more than two decades with fast counting electronic modules. This feature is of high interest to test and/or calibrate Campbelling mode electronic systems using the MINERVE ZPR.

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Fission chamber's neutron signal characterization using nonnegative matrix factorization

Arahmane

Moursli

Hamzaoui

2017

2017 International Conference on Advanced Technologies for Signal and Image Processing (ATSIP)

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On the fission chamber pulse charge acquisition and interpretation at MINERVE

Cited by 5 publications

References 21 publications

Influence of thermal and resonance neutron on fast neutron flux measurement by ²³⁹ Pu fission chamber

Influence of thermal and resonance neutron on fast neutron flux measurement by ²³⁹ Pu fission chamber

Impact of gas pressure on fission chamber sensitivity in Campbelling mode

Fission chamber's neutron signal characterization using nonnegative matrix factorization

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On the fission chamber pulse charge acquisition and interpretation at MINERVE

Cited by 5 publications

References 21 publications

Influence of thermal and resonance neutron on fast neutron flux measurement by 239 Pu fission chamber

Influence of thermal and resonance neutron on fast neutron flux measurement by 239 Pu fission chamber

Impact of gas pressure on fission chamber sensitivity in Campbelling mode

Fission chamber's neutron signal characterization using nonnegative matrix factorization

Contact Info

Product

Resources

About

Influence of thermal and resonance neutron on fast neutron flux measurement by ²³⁹ Pu fission chamber

Influence of thermal and resonance neutron on fast neutron flux measurement by ²³⁹ Pu fission chamber