Download or read book Neutron Time of flight Spectrometer for Laser fusion Experiments written by and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The basic concept of a time-of-flight spectrometer is illustrated. The spectrometer described can measure 14.1-MeV neutrons coming directly from the D-T plasma and also neutrons scattered by the air or ground or other structures within the vicinity of the flight path. (MOW).

Download or read book Neutron Diagnostics for Laser Fusion Experiments written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Three different neutron diagnostic instruments are used at our laboratory to acquire data for judging the performance of D-T filled laser-fusion targets. Large scintillation detectors and a neutron activation system are used to measure the number of 14-MeV reaction neutrons emitted from a target, and a 45-meter neutron time-of-flight spectrometer is used to determine the fuel ion temperature. At our facilities, the scintillation detectors are used for neutron yields above 104 per shot, and neutron activation by the 63Cu(n,2n)62Cu reaction is used as an additional diagnostic device for yields above 108 per shot. Application of these techniques to laser-fusion measurements data taken at the Argus laser facility, and neutron diagnostics being prepared for the Shiva facility are discussed. Comparison of experimental yield data obtained for a number of laser-fusion targets show that neutron yield values obtained by the neutron systems and .cap alpha.-particle yields by TOF methods are in good agreement.

Download or read book Neutron and Gamma Time of flight Measurements in Inertial Confinement Fusion Experiments written by Zaarah L. Mohamed and published by . This book was released on 2021 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This work includes the study of various nuclear processes relevant to inertial confinement fusion (ICF) plasmas and big bang nucleosynthesis via experiments performed at the OMEGA laser facility. Neutron and gamma time-of-flight detectors were used to determine various quantities of interest in cryogenic and room temperature implosions. In particular, xylene neutron time-of-flight (nTOF) detectors were used to determine areal densities from backscattered neutrons for OMEGA cryogenic experiments using a forward fit analysis. This analysis was extended to a recently deployed second nTOF line of sight (LOS) on OMEGA. The presence of two nTOF LOS enables a comparison of two measurements to study implosion symmetry, however, these two measurements still leave a lack of coverage around the target chamber which makes it difficult to infer the 3D shape of the areal density. This analysis can easily be extended to additional nTOF lines of sight in the future. The original xylene nTOF detector was also used to infer properties of the 5He ground state and first excited state via a simple wave-function amplitude analysis of neutron spectra from warm TT implosions. These quantities are particularly interesting because of their relationship to the gamma spectrum produced by DT fusion and additionally because the TT neutron spectrum is a background observed in the neutron spectra produced on cryogenic implosions. The ground state mass inferred via forward fit agrees with the accepted value [Audi et al., Nucl. Phys. A 729 (2003)], but the lifetime inferred here is about 70% longer than the accepted value [Wong, Anderson, & McClure, Nucl. Phys. 71 (1965)]. The mass and width of the first excited state were also inferred and compared to previously reported values, though there is a wide spread in the previously reported values. Cherenkov detectors were used to study gamma rays from the reactions D(T,5He)[gamma], H(D,3He)[gamma], and H(T,4He)[gamma] at low energies. The measurements detailed in this work result in a DT gamma-to-neutron branching ratio of (8.42 ł 2.84) × 10-5 measured at a center-of-mass (CM) energy of 19 ł 2 keV. This branching ratio is a factor of 2 larger than the branching ratio previously inferred on an ICF platform [Kim et al., Phys. Rev. C 85 (2012)], however, the error bars on the two measurements overlap. Considering a recent measurement of the DT gamma spectrum [Horsfield et al., Phys. Rev. C. 104 (2021)], the branching ratio measurement detailed in this work also appears to be in agreement with accelerator measurements [Cecil & Wilkinson, Phys. Rev. Lett. 53 (1984); Morgan et al., Phys. Rev. C. 33 (1986)] that isolated the ground state DT gamma. S factors for H(D,3He)[gamma] and H(T,4He)[gamma] were determined at low energies (ECM=16-37 keV). The inferred H(D,3He)[gamma] S factor appears to agree with accelerator data. The H(T,4He)[gamma] S factor inferred from one detector with a relatively high gamma energy threshold appears to be 25-70% larger than an evaluated S factor determined by including accelerator data at higher CM energies [Canon et al., Phys. Rev. C 65 (2002)], however, only two accelerator data points currently exist for comparison at these low energies and these two accelerator data points are in reasonable agreement with the S factors inferred using the high threshold detector as detailed in this work. Another detector with a very low minimum gamma energy threshold was also used to study the H(T,4He)[gamma] S factor. This detector inferred significantly higher values for the H(T,4He)[gamma] S factor, but this particular measurement is thought to be contaminated by detection of neutron-induced gammas from remaining shell material. These time-of-flight gamma measurements require some assumptions concerning the gamma spectrum from each reaction in order to infer branching ratios or S factors. This is not ideal, however, traditional pulse height gamma detection cannot be used for detection of fusion gammas in ICF experiments due to the short time scales involved. Two potential designs are discussed for a true gamma spectrometer intended for operation at ICF facilities"--Pages ix-x.

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration. Technical Information Center and published by . This book was released on 1977 with total page 1682 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ERDA Energy Research Abstracts written by and published by . This book was released on 1977 with total page 742 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Energy Research Abstracts written by and published by . This book was released on 1994-11 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ERDA Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1976 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advanced Diagnostics for Magnetic and Inertial Fusion written by Peter E. Stott and published by Springer Science & Business Media. This book was released on 2011-06-28 with total page 449 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the International Conference on Advanced Diagnostics for Magnetic and Inertial Fusion, held September 3-7, 2001 at Villa Monastero, Varenna, Italy. This volume focuses on future diagnostic requirements for fusion energy research emphasizing advanced diagnostics, new techniques and areas where further progress is required.

Download or read book A Novel Method for Modeling the Neutron Time of Flight nTOF Detector Response in Current Mode to Inertial Confinement Fusion Experiments written by and published by . This book was released on 2012 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1976 with total page 1320 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fusion Energy Update written by and published by . This book was released on 1978 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Neutron Time of Flight Spectrometer Appropriate for D T Plasma Diagnostics written by Thomas Elevant and published by . This book was released on 1984 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analysis of the Neutron Time of flight Spectra from Inertial Confinement Fusion Experiments written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: For a long time, neutron time-of-flight diagnostics been used to characterize the neutron spectrum produced by inertial confinement fusion experiments. The primary diagnostic goals are to extract the d+t→n+[alpha] (DT) and d+d→n+3He (DD) neutron yields and peak widths, and the amount DT scattering relative to its unscattered yield, which is also known as the down-scatter ratio (DSR). These quantities are used to infer yield weighted plasma conditions, such as ion temperature (Tion) and cold fuel areal density. We explain such novel methodologies used to determine neutron yield, apparent Tion and DSR.

Download or read book A Rotating shutter Time of flight Neutron Spectrometer for the Resonance Region written by Walter Selove and published by . This book was released on 1949 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: A resonance region spectrometer for use with a pile has now been built and put into operation. The first part of this paper describes the design considerations, constructional details, and operational features of the apparatus, and the second part describes some measurements with the apparatus.

Download or read book Neutron Time of flight Spectrometer for Diagnostics of D T Fusion Plasma written by J. Kallne and published by . This book was released on 1985 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: