Neutron Generators For Wireline Applications

Ethridge, R.; Valentine, J.D.; Stokes, E.

doi:10.1109/nssmic.1990.693467

Cited by 2 publications

(4 citation statements)

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“…and Ridgefield, Conn. [72,73,148] Since that time scores of other patents and research papers have been published on improvements and advances in the underlying technology and the oilfield applications that use neutron generators. [93,[149][150][151][152][153] Common characteristics of these devices are their small size (in order to fit within small diameter well holes ranging from 5 cm or less up to 20 cm), simplicity of use and low power consumption (in order to allow operation up to several kilometers below the Earth's surface, far from external control systems or power supplies), and extreme ruggedness and durability (to withstand prolonged exposure to high temperatures and pressures, shock, vibration, and corrosive environments). Functionally they generally use the DT fusion reaction, are capable of generating O(10 8 ) n/s, and pulse from 1,000 Hz to 20,000 Hz with duty cycles of about 10%.…”

Section: Geophysical Explorationmentioning

confidence: 99%

Production and applications of neutrons using particle accelerators

Chichester

2009

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Advances in neutron science have gone hand in hand with the development and of particle accelerators from the beginning of both fields of study. Early accelerator systems were developed simply to produce neutrons, allowing scientists to study their properties and how neutrons interact in matter, but people quickly realized that more tangible uses existed too. Today the diversity of applications for industrial accelerator-based neutron sources is high and so to is the actual number of instruments in daily use is high, and they serve important roles in the fields where they're used. This chapter presents a technical introduction to the different ways particle accelerators are used to produce neutrons, an historical overview of the early development of neutron-producing particle accelerators, a description of some current industrial accelerator systems, narratives of the fields where neutron-producing particle accelerators are used today, and comments on future trends in the industrial uses of neutron producing particle accelerators.

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Section: Geophysical Explorationmentioning

confidence: 99%

Production and applications of neutrons using particle accelerators

Chichester

2009

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“…These techniques are commonly employed in the manufacture of sealed tube neutron generators. Figure 5 is a spectrum from an asfabricated array in an atmosphere of 10 5 Torr D 2 , at an applied field of 1.6 V/Å where H, H 2 O and C are observed. The source of H is as yet unclear.…”

Section: Fig 2: the Modification Performed To Standard Spindttype Arrmentioning

confidence: 99%

“…With few exceptions the ion sources in these generators extract ions from a plasma created in various types of electrical discharges [2]. This leads to generators with either long lifetimes (1000 h) and low outputs (~10 8 n/s), such as well logging generators, or high outputs (>10 12 n/s) and short lifetimes (a few hours).…”

Section: Introductionmentioning

confidence: 99%

“…Existing compact, sealedtube neutron generators create and then accelerate deuterium (D) and/or tritium (T) ions into D and/or T-hydrided metal targets to produce neutrons by the DD or DT nuclear fusion reactions D + D → n + 3 He and D + T → n + 4 He. With few exceptions the ion sources in these generators extract ions from a plasma created in various types of electrical discharges [2]. This leads to generators with either long lifetimes (1000 h) and low outputs (~10 8 n/s), such as well logging generators, or high outputs (>10 12 n/s) and short lifetimes (a few hours).…”

Section: Introductionmentioning

confidence: 99%

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Field desorption ion source development for neutron generators

Solano

Reichenbach

Schwoebel

et al. 2008

Nuclear Instruments and Methods in Physics Research Section A:

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A new approach to deuterium ion sources for deuteriumtritium neutron generators is being developed. The source is based upon the field desorption of deuterium from the surfaces of metal tips.Field desorption studies of microfabricated field emitter tip arrays have been conducted for the first time. Maximum fields of 3 V/Å have been applied to the array tip surfaces to date, although achieving fields of 2 V/ Å to possibly 2.5 V/Å is more typical. Both the desorption of atomic deuterium ions and the gas phase field ionization of molecular deuterium has been observed at fields of roughly 2 V/Å and 23 V/Å, respectively, at room temperature. The desorption of common surface adsorbates, such as hydrogen, carbon, water, and carbon monoxide is observed at fields exceeding ~1 V/Å. In vacuo heating of the arrays to temperatures of the order of 800˚C can be effective in removing many of the surface contaminants observed.

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Neutron Generators For Wireline Applications

Cited by 2 publications

References 4 publications

Production and applications of neutrons using particle accelerators

Production and applications of neutrons using particle accelerators

Field desorption ion source development for neutron generators

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