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Rubery MS, Ose N, Schneider M, Moore AS, Carrera J, Mariscal E, Ayers J, Bell P, Mackinnon A, Bradley D, Landen OL, Thompson N, Carpenter A, Winters S, Ehrlich B, Sarginson T, Rendon A, Liebman J, Johnson K, Merril D, Grant G, Shingleton N, Taylor A, Ruchonnet G, Stanley J, Cohen M, Kohut T, Issavi R, Norris J, Wright J, Stevers J, Masters N, Latray D, Kilkenny J, Stolte WC, Conlon CS, Troussel P, Villette B, Emprin B, Wrobel R, Lejars A, Chaleil A, Bridou F, Delmotte F. A 2-4 keV multilayer mirrored channel for the NIF Dante system. Rev Sci Instrum 2022; 93:113502. [PMID: 36461505 DOI: 10.1063/5.0101695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 09/09/2022] [Indexed: 06/17/2023]
Abstract
During inertial confinement fusion experiments at the National Ignition Facility (NIF), a capsule filled with deuterium and tritium (DT) gas, surrounded by a DT ice layer and a high-density carbon ablator, is driven to the temperature and densities required to initiate fusion. In the indirect method, 2 MJ of NIF laser light heats the inside of a gold hohlraum to a radiation temperature of 300 eV; thermal x rays from the hohlraum interior couple to the capsule and create a central hotspot at tens of millions degrees Kelvin and a density of 100-200 g/cm3. During the laser interaction with the gold wall, m-band x rays are produced at ∼2.5 keV; these can penetrate into the capsule and preheat the ablator and DT fuel. Preheat can impact instability growth rates in the ablation front and at the fuel-ablator interface. Monitoring the hohlraum x-ray spectrum throughout the implosion is, therefore, critical; for this purpose, a Multilayer Mirror (MLM) with flat response in the 2-4 keV range has been installed in the NIF 37° Dante calorimeter. Precision engineering and x-ray calibration of components mean the channel will report 2-4 keV spectral power with an uncertainty of ±8.7%.
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Affiliation(s)
- M S Rubery
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - N Ose
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - M Schneider
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - A S Moore
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - J Carrera
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - E Mariscal
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - J Ayers
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - P Bell
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - A Mackinnon
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - D Bradley
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - O L Landen
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - N Thompson
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - A Carpenter
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - S Winters
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - B Ehrlich
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - T Sarginson
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - A Rendon
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - J Liebman
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - K Johnson
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - D Merril
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - G Grant
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - N Shingleton
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - A Taylor
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - G Ruchonnet
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - J Stanley
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - M Cohen
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - T Kohut
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - R Issavi
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - J Norris
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - J Wright
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - J Stevers
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - N Masters
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - D Latray
- Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551-0808, USA
| | - J Kilkenny
- General Atomics, San Diego, California 92121, USA
| | - W C Stolte
- MSTS, Mission Support and Test Services LLC, Livermore, California 94550-9239, USA
| | - C S Conlon
- MSTS, Mission Support and Test Services LLC, Livermore, California 94550-9239, USA
| | - Ph Troussel
- Commissariat à l'Énergie Atomique (CEA), DAM, DIF, F-91297 Arpajon, France
| | - B Villette
- Commissariat à l'Énergie Atomique (CEA), DAM, DIF, F-91297 Arpajon, France
| | - B Emprin
- Commissariat à l'Énergie Atomique (CEA), DAM, DIF, F-91297 Arpajon, France
| | - R Wrobel
- Commissariat à l'Énergie Atomique (CEA), DAM, DIF, F-91297 Arpajon, France
| | - A Lejars
- Commissariat à l'Énergie Atomique (CEA), DAM, DIF, F-91297 Arpajon, France
| | - A Chaleil
- Commissariat à l'Énergie Atomique (CEA), DAM, DIF, F-91297 Arpajon, France
| | - F Bridou
- Laboratoire Charles Fabry, 2, Av. Augustin Fresnel, 91127 Palaiseau Cedex, France
| | - F Delmotte
- Laboratoire Charles Fabry, 2, Av. Augustin Fresnel, 91127 Palaiseau Cedex, France
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