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Webb TJ, Bliss DE, Chandler GA, Dolan DH, Dunham G, Edens A, Harding E, Johnston MD, Jones MC, Langendorf S, Mangan M, Maurer AJ, McCoy CA, Moore NW, Presura R, Steiner AM, Wu M, Yager-Elorriaga DA, Yates KC. Radiation, optical, power flow, and electrical diagnostics at the Z facility: Layout and techniques utilized to operate in the harsh environment. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2023; 94:031102. [PMID: 37012753 DOI: 10.1063/5.0123448] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Accepted: 02/20/2023] [Indexed: 06/19/2023]
Abstract
The Z machine is a current driver producing up to 30 MA in 100 ns that utilizes a wide range of diagnostics to assess accelerator performance and target behavior conduct experiments that use the Z target as a source of radiation or high pressures. We review the existing suite of diagnostic systems, including their locations and primary configurations. The diagnostics are grouped in the following categories: pulsed power diagnostics, x-ray power and energy, x-ray spectroscopy, x-ray imaging (including backlighting, power flow, and velocimetry), and nuclear detectors (including neutron activation). We will also briefly summarize the primary imaging detectors we use at Z: image plates, x-ray and visible film, microchannel plates, and the ultrafast x-ray imager. The Z shot produces a harsh environment that interferes with diagnostic operation and data retrieval. We term these detrimental processes "threats" of which only partial quantifications and precise sources are known. We summarize the threats and describe techniques utilized in many of the systems to reduce noise and backgrounds.
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Affiliation(s)
- T J Webb
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - D E Bliss
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - G A Chandler
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - D H Dolan
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - G Dunham
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - A Edens
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - E Harding
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - M D Johnston
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - M C Jones
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - S Langendorf
- Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, USA
| | - M Mangan
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - A J Maurer
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - C A McCoy
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - N W Moore
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - R Presura
- Nevada National Security Site, Albuquerque Operations, Albuquerque, New Mexico 87185, USA
| | - A M Steiner
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - M Wu
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - D A Yager-Elorriaga
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - K C Yates
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
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Gatu Johnson M. Charged particle diagnostics for inertial confinement fusion and high-energy-density physics experiments. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2023; 94:021104. [PMID: 36859013 DOI: 10.1063/5.0127438] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Accepted: 01/21/2023] [Indexed: 06/18/2023]
Abstract
MeV-range ions generated in inertial confinement fusion (ICF) and high-energy-density physics experiments carry a wealth of information, including fusion reaction yield, rate, and spatial emission profile; implosion areal density; electron temperature and mix; and electric and magnetic fields. Here, the principles of how this information is obtained from data and the charged particle diagnostic suite currently available at the major US ICF facilities for making the measurements are reviewed. Time-integrating instruments using image plate, radiochromic film, and/or CR-39 detectors in different configurations for ion counting, spectroscopy, or emission profile measurements are described, along with time-resolving detectors using chemical vapor deposited diamonds coupled to oscilloscopes or scintillators coupled to streak cameras for measuring the timing of ion emission. A brief description of charged-particle radiography setups for probing subject plasma experiments is also given. The goal of the paper is to provide the reader with a broad overview of available capabilities, with reference to resources where more detailed information can be found.
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Affiliation(s)
- M Gatu Johnson
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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Mangan MA, Ruiz CL, Cooper GW, Chandler GA, Ampleford DJ. Inferring neutron yields using indium activation samples for small fractions of tritium added to deuterium fuel in inertial confinement fusion (ICF) experiments. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:103514. [PMID: 36319333 DOI: 10.1063/5.0101823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 09/01/2022] [Indexed: 06/16/2023]
Abstract
In inertial confinement fusion experiments, the neutron yield is an important metric for thermonuclear fusion performance. Neutron activation diagnostics can be used to infer neutron yields. The material used for neutron activation diagnostic undergoes a threshold reaction so that only neutrons having energies above the threshold energy are observed. For thermonuclear experiments using deuterium (D) and tritium (T) fuel constituents, neutrons arising from D + D reactions (DD-neutrons) and neutrons resulting from D + T reactions (DT-neutrons) are of primary interest. Indium has two neutron activation reactions that can be used to infer yields of DD-neutrons and DT-neutrons. One threshold is high enough that only DT-neutrons can induce activation, the second reaction can be activated by both DD-neutrons and DT-neutrons. Thus, to obtain the DD-neutron yield, the contribution made by DT-neutrons to the total induced activity must be extracted. In DD-fuel experiments, DT-neutrons arise from secondary reactions, which are significantly lower in number than primary DD-neutrons, and their contribution to the inferred DD-neutron yield can be ignored. When the DD- and DT-neutron yields become comparable, such as when low tritium fractions are added to DD-fuel, the contribution of DT-neutrons must be extracted to obtain accurate yields. A general method is described for this correction to DD-neutron yields.
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Affiliation(s)
- M A Mangan
- Fusion Experiments Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
| | - C L Ruiz
- Fusion Experiments Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
| | - G W Cooper
- Department of Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131, USA
| | - G A Chandler
- Fusion Experiments Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
| | - D J Ampleford
- Fusion Experiments Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
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Zhu C, Zhang J, Ke T. A real-time multi-function digital coincidence spectrometer for neutron copper activation diagnostics. Appl Radiat Isot 2022; 185:110229. [DOI: 10.1016/j.apradiso.2022.110229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 03/02/2022] [Accepted: 04/04/2022] [Indexed: 11/02/2022]
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Styron JD, Ruiz CL, Hahn KD, Cooper GW, Chandler GA, Jones B, McWatters BR, Forrest CJ, Vaughan J, Torres J, Pelka S, Smith J, Weaver C. Average neutron time-of-flight instrument response function inferred from single D-T neutron events within a plastic scintillator. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:10I119. [PMID: 30399763 DOI: 10.1063/1.5038883] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2018] [Accepted: 07/08/2018] [Indexed: 06/08/2023]
Abstract
The apparent ion temperature and neutron-reaction history are important characteristics of a fusion plasma. Extracting these quantities from a measured neutron-time-of-flight signal requires accurate knowledge of the instrument response function (IRF). This work describes a novel method for obtaining the IRF directly for single DT neutron interactions by utilizing n-alpha coincidence. The t(d,α)n nuclear reaction was produced at Sandia National Laboratories' Ion Beam Laboratory using a 300 keV Cockcroft-Walton generator to accelerate a 2.5 μA beam of 175 keV D+ ions into a stationary ErT2 target. The average neutron IRF was calculated by taking a time-corrected average of individual neutron events within an EJ-228 plastic scintillator. The scintillator was coupled to two independent photo-multiplier tubes operated in the current mode: a Hamamatsu 5946 mod-5 and a Photek PMT240. The experimental setup and results will be discussed.
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Affiliation(s)
- J D Styron
- Department of Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131, USA
| | - C L Ruiz
- Sandia National Laboratories, Albuquerque, New Mexico 87123, USA
| | - K D Hahn
- Sandia National Laboratories, Albuquerque, New Mexico 87123, USA
| | - G W Cooper
- Department of Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131, USA
| | - G A Chandler
- Sandia National Laboratories, Albuquerque, New Mexico 87123, USA
| | - B Jones
- Sandia National Laboratories, Albuquerque, New Mexico 87123, USA
| | - B R McWatters
- Sandia National Laboratories, Albuquerque, New Mexico 87123, USA
| | - C J Forrest
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - J Vaughan
- Department of Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131, USA
| | - J Torres
- Sandia National Laboratories, Albuquerque, New Mexico 87123, USA
| | - S Pelka
- Department of Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131, USA
| | - J Smith
- Sandia National Laboratories, Albuquerque, New Mexico 87123, USA
| | - C Weaver
- Department of Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131, USA
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Gomez MR, Slutz SA, Sefkow AB, Sinars DB, Hahn KD, Hansen SB, Harding EC, Knapp PF, Schmit PF, Jennings CA, Awe TJ, Geissel M, Rovang DC, Chandler GA, Cooper GW, Cuneo ME, Harvey-Thompson AJ, Herrmann MC, Hess MH, Johns O, Lamppa DC, Martin MR, McBride RD, Peterson KJ, Porter JL, Robertson GK, Rochau GA, Ruiz CL, Savage ME, Smith IC, Stygar WA, Vesey RA. Experimental demonstration of fusion-relevant conditions in magnetized liner inertial fusion. PHYSICAL REVIEW LETTERS 2014; 113:155003. [PMID: 25375714 DOI: 10.1103/physrevlett.113.155003] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Indexed: 06/04/2023]
Abstract
This Letter presents results from the first fully integrated experiments testing the magnetized liner inertial fusion concept [S. A. Slutz et al., Phys. Plasmas 17, 056303 (2010)], in which a cylinder of deuterium gas with a preimposed 10 Taxial magnetic field is heated by Z beamlet, a 2.5 kJ, 1 TW laser, and magnetically imploded by a 19 MA, 100 ns rise time current on the Z facility. Despite a predicted peak implosion velocity of only 70 km = s, the fuel reaches a stagnation temperature of approximately 3 keV, with T(e) ≈ T(i), and produces up to 2 x 10(12) thermonuclear deuterium-deuterium neutrons. X-ray emission indicates a hot fuel region with full width at half maximum ranging from 60 to 120 μm over a 6 mm height and lasting approximately 2 ns. Greater than 10(10) secondary deuterium-tritium neutrons were observed, indicating significant fuel magnetization given that the estimated radial areal density of the plasma is only 2 mg = cm(2).
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Affiliation(s)
- M R Gomez
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - S A Slutz
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - A B Sefkow
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - D B Sinars
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - K D Hahn
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - S B Hansen
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - E C Harding
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - P F Knapp
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - P F Schmit
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - C A Jennings
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - T J Awe
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - M Geissel
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - D C Rovang
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - G A Chandler
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - G W Cooper
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - M E Cuneo
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - A J Harvey-Thompson
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - M C Herrmann
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - M H Hess
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - O Johns
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - D C Lamppa
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - M R Martin
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - R D McBride
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - K J Peterson
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - J L Porter
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - G K Robertson
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - G A Rochau
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - C L Ruiz
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - M E Savage
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - I C Smith
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - W A Stygar
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
| | - R A Vesey
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
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