Comparison of four calibration techniques of a silver activated Geiger counter for the determination of the neutron yield on the Frascati plasma focus experiment

Gentilini, A.; Rager, J. P.; Steinmetz, K.; Tacchi, Massimo; Antonini, Davide; Arcipiani, B.; Moioli, Pietro; Pedretti, Edmondo; Scafè, R.

doi:10.1016/0029-554x(80)90347-x

Cited by 37 publications

(19 citation statements)

References 10 publications

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“…The comparison shows that the (n, c) reaction rate for Am-Be neutrons is about 16.5 % less than that of 2.5 MeV neutrons. This has been also shown in Gentilini et al's [18] measurements that the K value changes from 3.89 ± 1.00 9 10 7 neutrons per shot to 3.40 ± 0.85 9 10 7 neutrons per shot for Am-B and Am-Be neutron sources, respectively, which gives about 13 % error for calibration factor value.…”

Section: Experimental Studiesmentioning

confidence: 55%

“…According to Gentilini et al [18], there are at least four calibration constant measurement methods among which it has been decided to incorporate the count rate measurement at saturation, following Etaati et al [19], whose more general approach is comparable to Gentillini et al's. In this method, the purpose is the measurement of thermal neutron flux per unit neutron source (i.e., c value) in the detectors, for which at t = t 0 a neutron source with intensity I 0 (in neutron/s unit) is placed at the position where the plasma is formed in the PF device.…”

Section: Theorymentioning

confidence: 99%

“…Let K be the calibration constant, G 12 the detector count in time interval between T 1 and T 2 , and Y the neutron yield in neutron per shot unit. Then, we have [18]:…”

Section: Theorymentioning

confidence: 99%

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Design and Fabrication of a Data Acquisition System for Pulsed Neutron Flux Measurement of Plasma Focus Devices

et al. 2014

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Silver-activated Geiger counters together with a polyethylene layer as neutron moderator are frequently used in pulsed neutron flux measurements in research studies with plasma focus (PF) devices. In this study, an array of seven counters was used at seven different angles (0°, ±30°, ±60°a nd ±90°) to the PF-axis for which a software and a 10-channel data acquisition hardware (PCT2660) compatible with NIM standards have been designed and fabricated. In the proposed PCT2660, the preset timing algorithms are considered as general and they can be programmed for required detector calibrations and neutron flux measurements. The calibration constant measurement has been undertaken with a 16.5 Ci Am-Be source of 35 mm diameter by 70 mm cylindrical active volume located at anode top whilst the neutron flux at zero degree of PF device axis at 13.5 kV operating voltage and 13.54 9 10 -2 PSI pressure is measured as (2.88 ± 0.29) 9 10 8 neutrons per shot. Accordingly, the studies on the angular distribution of the PF neutron emission within the pressure range of 7.73 9 10 -2 -15.47 9 10 -2 PSI confirm an anisotropy ranging from 1.53 ± 0.09 to 2.95 ± 0.24 and a symmetry of angular distribution around the anode axis.

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Section: Experimental Studiesmentioning

confidence: 55%

Section: Theorymentioning

confidence: 99%

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Design and Fabrication of a Data Acquisition System for Pulsed Neutron Flux Measurement of Plasma Focus Devices

et al. 2014

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“…From these twenty shots, fifteen shots with higher neutron yield were selected and the mean value of these was calculated. Detector calibration was done with an Am-Be source and with source removal method (Gentilini et al 1980). Aluminum sample, which was irradiated by hydrogen ions in each mentioned height, was punctured at the place of maximum ion density.…”

Section: Methodsmentioning

confidence: 99%

Investigation of deuterated target effects on neutron yield in plasma focus device SBUMTPF1

2014

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In this research, the effect of inserting deuterated solid target in plasma focus device 'SBUMTPF1' on neutron yield has been investigated. The deuterated target with the diameter of 2.5 cm was placed at different heights relative to the anode tip. In each height, the best place of target (where the ion density is highest) was found from observing the effects of ions struck on the aluminum samples. Also for each height, 20 shots were performed at the optimum pressure of deuterium working gas and operating voltage, which are equal to 1.5 mbar and 24 kV, respectively. The neutron production was measured with two activation counters, which placed in 0 • and 90 • relative to the anode axis. Neutron scattering from two activation counters was calculated with MCNP4C code and the results showed that this effect is negligible. In this article, the probability of implanting deuterium ions into the titanium target was also investigated. Deviation angle of the ion emission relative to the anode axis was measured experimentally in this research and it was about 3.1 • .

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“…The counts being taken for two 100-s period immediately after the focus is fired. Calibration is performed with source removal method [16] using a 5Ci Am-Be reference neutron source. In SBUPF1 we also studied the amplitude of neutron signal pulse as detected by a PMT + plastic scintillator.…”

Section: Experimental Arrangementmentioning

confidence: 99%

Construction and experimental study of a 2.5kJ, simply configured, mather type plasma focus device

Shirani

Abbasi

2010

Braz. J. Phys.

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In this work, a 2.5kJ plasma focus device (named as SBUPF1) has been constructed on the basis of a simple configuration. The most important characteristics of this configuration is relative simplicity and using less components in its structure compared with common configurations. SBUPF1 has been tested between 18-25kV and wide range of pressure for various gases including Argon, Neon and Deuterium. The system shows consistent and reproducible plasma focusing action as well as fusion neutron production (when deuterium is used as working gas).

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Comparison of four calibration techniques of a silver activated Geiger counter for the determination of the neutron yield on the Frascati plasma focus experiment

Cited by 37 publications

References 10 publications

Design and Fabrication of a Data Acquisition System for Pulsed Neutron Flux Measurement of Plasma Focus Devices

Design and Fabrication of a Data Acquisition System for Pulsed Neutron Flux Measurement of Plasma Focus Devices

Investigation of deuterated target effects on neutron yield in plasma focus device SBUMTPF1

Construction and experimental study of a 2.5kJ, simply configured, mather type plasma focus device

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