Calibration of CR-39 for detecting fusion neutrons

Collopy, M.T.; Carpenter, P. K.; Harmon, Charles D.; Vandenberg, J. M.; Cooper, G. W.; Ruiz, C. L.; Reyes, P.; Stygar, W. A.; Schmidlapp, A.; Malbrough, D. J.; Becker, Robert

doi:10.1063/1.1143542

Cited by 15 publications

(9 citation statements)

References 2 publications

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“…For D-D neutrons, the quantum efficiency of CR39 is 1.1 × 10 −4 tracks per incident neutrons. [11][12][13] To enhance the response to D-D neutrons, a 1 mm thick layer of high density polyethylene (HDPE) was positioned ahead of CR39. Incident neutrons interact with the HDPE producing a proton, which has a much higher efficiency than neutrons in CR39.…”

Section: Detector Designmentioning

confidence: 99%

One dimensional imager of neutrons on the Z machine

Ampleford

Ruiz

Fittinghoff

et al. 2018

Review of Scientific Instruments

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We recently developed a one-dimensional imager of neutrons on the Z facility. The instrument is designed for Magnetized Liner Inertial Fusion (MagLIF) experiments, which produce D-D neutrons yields of ∼3 × 10 12. X-ray imaging indicates that the MagLIF stagnation region is a 10-mm long, ∼100-µm diameter column. The small radial extents and present yields precluded useful radial resolution, so a one-dimensional imager was developed. The imaging component is a 100-mm thick tungsten slit; a rolled-edge slit limits variations in the acceptance angle along the source. CR39 was chosen as a detector due to its negligible sensitivity to the bright x-ray environment in Z. A layer of high density poly-ethylene is used to enhance the sensitivity of CR39. We present data from fielding the instrument on Z, demonstrating reliable imaging and track densities consistent with diagnosed yields. For yields ∼3 × 10 12 , we obtain resolutions of ∼500 µm.

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Section: Detector Designmentioning

confidence: 99%

One dimensional imager of neutrons on the Z machine

Ampleford

Ruiz

Fittinghoff

et al. 2018

Review of Scientific Instruments

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“…The angular distribution of the (time-integrated) neutron flux φ was also measured with CR-39 plates. This method had shortly before been used by other authors [20,21] to detect neutrons of energy around 2.5 MeV. Our CR-39 plates (2 cm × 2 cm of surface area and 0.5 mm thick) were arranged on a circular arc of 1 m radius, centred at the focus and outside the discharge chamber, at six different angles relative to the gun axis: 0 • , 5 15 • , 25 • and 90 • .…”

Section: The Experimentsmentioning

confidence: 99%

Some experimental research on anisotropic effects in the neutron emission of dense plasma-focus devices

Mejía

Milanese

Moroso

et al. 1997

J. Phys. D: Appl. Phys.

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An axial plasma jet emitted from the dense plasma focus (DPF) was detected using a Faraday cup. The jet was registered into a cone with a half angle of 6 • . The angular measurements of the D-D fusion neutron flux, performed with CR-39 nuclear track detectors, allowed us to see that there is a high anisotropy of the neutron flux just in a narrow cone, practically coincident with that of the plasma jet. This phenomenon is consistent with a DPF thermonuclear model based on the hypothesis of axial inertial plasma confinement. The same Faraday cup measurements showed the existence of very collimated and brief (about 10 ns) ion beams. Image-converter pinch photographs showed that these beams could be produced by spatial charge-separation effects due to m = 0 instabilities. The beam energy spectrum, obtained with track detectors, had the range from 0.7-5 MeV. Both plasma jets and high energy beams can explain the high angular anisotropy of the neutron flux, in terms of non-thermal fusion mechanisms. On the basis of these experimental results we discuss the coexistence of thermal and non-thermal mechanisms for neutron production in a DPF.

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“…C 12 H 16 O 7 ) nuclear track detectors for proton detection is widely known [10,16]. In addition, Collopy and his colleagues [17] have used these detectors as a diagnostic tool for neutrons from D-D and D-T reactions. In order to detect the neutrons, a radiator material, for instance polyethylene, paraffin, can be placed in front of the detectors, so the detection efficiency can be increased further [18].…”

Section: Introductionmentioning

confidence: 99%

Preliminary plasma focus studies at ODAK-3K device using track detectors

Akgun

Bolukdemir

Kurt

et al. 2009

Plasma Devices and Operations

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In this study, a newly-constructed plasma focus (PF) device ODAK-3K is introduced to the literature and some results of first fusion research realized in this device are reported. The device has a maximal energy input of 3 kJ and is used for both plasma and D-D reaction explorations. Experiments with deuterium have shown that peak current of I peak = 39 kA flows between the electrodes at P = 11.5 mbar for the operation voltage of V = 14 kV. An average total neutron yield is measured around 3.3 × 10 5 neutrons per shot using CR-39 plastic detectors located in different places opposite to the anode inside the PF chamber. Neutron anisotropy and pressure-dependent neutron yields are also determined for a series of shots.

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Calibration of CR-39 for detecting fusion neutrons

Cited by 15 publications

References 2 publications

One dimensional imager of neutrons on the Z machine

One dimensional imager of neutrons on the Z machine

Some experimental research on anisotropic effects in the neutron emission of dense plasma-focus devices

Preliminary plasma focus studies at ODAK-3K device using track detectors

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