Scattered and (n,2n) neutrons as a measure of areal density in ICF capsules

Wilson, D. C.; Mead, W. C.; Disdier, L.; Houry, M.; Bourgade, J. L.; Murphy, T. J.

doi:10.1016/s0168-9002(02)00474-6

Cited by 40 publications

(19 citation statements)

References 19 publications

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“…It is expected that noise coming from neutrons being scattered from the chamber walls will be significant. 2,3 To circumvent this, the detector system was placed at a 2 m distance from the target in order to detect DS neutrons at a much earlier time, prior to the onset of noise from the chamber wall scattering. Figure 4 shows the TOF neutron spectrum, which includes chamberscattering noise.…”

Section: Current Mode Tof Detector Designmentioning

confidence: 99%

“…The imaging of the DS neutrons is also fascinating as it offers observation of the asymmetry of the core shape. [2][3][4][5] The measurement of the DS neutrons comes with an inherent technical difficulty, wherein the DS neutrons must be discriminated from the much stronger primary neutron "flash" within a very short time-of-flight ͑TOF͒ difference window. Figure 1 shows the neutron energy spectrum calculated using MCNP5 Monte Carlo neutron transport code.…”

Section: Introductionmentioning

confidence: 99%

“…Down-scattered neutron imaging detector for areal density measurement of inertial confinement fusion a… Y. Arikawa, 1,b͒ K. Yamanoi, 1 T. Nakazato, 1 E. S. Estacio, 1 T. Shimizu, 1 N. Sarukura, 1 M. Nakai, 1 H. Hosoda, 1 T. Norimatsu, 1 Y. Hironaka, 1 H. Azechi, 1 N. Izumi, 2 T. Murata, 1,3 S. Fujino, 4 H. Yoshida, 5 K. Kamada, 6 Y. Usuki, 6 T. Suyama, 7 A custom developed 6 Li glass scintillator ͑APLF80+ 3Pr͒ for down-scattered neutron diagnostics in inertial confinement fusion experiments is presented. 6 Li provides an enhanced sensitivity for down-scattered neutrons in DD fusion and its experimentally observed 5-6 ns response time fulfills the requirement for down-scattered neutron detectors.…”

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confidence: 99%

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Down-scattered neutron imaging detector for areal density measurement of inertial confinement fusion

Arikawa

Yamanoi

Nakazato

et al. 2010

Review of Scientific Instruments

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A custom developed (6)Li glass scintillator (APLF80+3Pr) for down-scattered neutron diagnostics in inertial confinement fusion experiments is presented. (6)Li provides an enhanced sensitivity for down-scattered neutrons in DD fusion and its experimentally observed 5-6 ns response time fulfills the requirement for down-scattered neutron detectors. A time-of-flight detector operating in the current mode using the APLF80+3Pr was designed and its feasibility observing down-scattered neutrons was demonstrated. Furthermore, a prototype design for a down-scattered neutron imaging detector was also demonstrated. This material promises viability as a future down-scattered neutron detector for the National Ignition Facility.

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Section: Current Mode Tof Detector Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Down-scattered neutron imaging detector for areal density measurement of inertial confinement fusion

Arikawa

Yamanoi

Nakazato

et al. 2010

Review of Scientific Instruments

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“…Measurements of fuel areal density <ρr> are essential for characterizing ICF target capsule implosions and are traditionally performed using a number of neutronbased techniques [46,[54][55][56]. One method involves the detection of secondary neutrons produced in reactions in pure deuterium fuel and is useful for <ρr> values below about 20 mg/cm 2 [57].…”

Section: Ii9 Neutron Diagnosticsmentioning

confidence: 99%

Diagnostics development plan for ZR.

Hanson¹

2003

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The Z Refurbishment (ZR) Project is a program to upgrade the Z machine at SNL with modern durable pulsed power technology, providing additional shot capacity and improved reliability as well as advanced capabilities for both pulsed x-ray production and high pressure generation. The development of enhanced diagnostic capabilities is an essential requirement for ZR to meet critical mission needs. This report presents a comprehensive plan for diagnostic instrument and infrastructure development for the first few years of ZR operation. The focus of the plan is on: (1) developing diagnostic instruments with high spatial and temporal resolution, capable of low noise operation and survival in the severe EMP, bremsstrahlung, and blast environments of ZR; and (2) providing diagnostic infrastructure improvements, including reduced diagnostic trigger signal jitter, more and flexible diagnostic line-of-sight access, and the capability for efficient exchange of diagnostics with other laboratories. This diagnostic plan is the first step in an extended process to provide enhanced diagnostic capabilities for ZR to meet the diverse programmatic needs of a broad range of defense, energy, and general science programs of an international user community into the next decade. ZR Diagnostics Development Plan ________________________________________________________________________ 4 AcknowledgementsThe author would like to thank

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“…The fraction of down-scattered neutrons with respect to the primary neutrons corresponds to the areal density of the plasma. Consequently, measurement of down-scattered neutrons has received much attention for its potential to measure the fuel areal density, rR [2][3][4]. In order to discriminate down-scattered neutrons from primary neutrons and strong X-ray, a scintillator with fast decay and high sensitivity for down-scattered neutrons is strongly required [5].…”

Section: Introductionmentioning

confidence: 99%