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Wang RR, An HH, Xie ZY, Wang W. Conversion efficiency of multi-keV L-shell-band X-ray emission. OPTICS EXPRESS 2021; 29:31726-31738. [PMID: 34615260 DOI: 10.1364/oe.434527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Accepted: 09/01/2021] [Indexed: 06/13/2023]
Abstract
This study explored the influence of foil thickness, laser pulse width, and laser intensity to optimize the multi-keV X-ray conversion efficiency of a sandwiched (CH/Sn/CH) planar target under laser irradiation at the Shenguang II laser facility. The X-ray photon field values were measured using a set of elliptically bent crystal spectrometers and the conversion efficiencies (ξx) of photon energies were in the range of 3.7-4.3 keV. The experimental results indicate that the X-ray yields of 3.7 to 4.3 keV radiation strongly depend on the laser pulse width, target thickness, and laser intensity. The results also demonstrate that three-layer thin foils can provide an efficient multi-keV X-ray source because they can change the distribution of emitted multi-keV X-rays and target dynamics versus nanosecond laser pulses to produce large, hot, and underdense plasma. However, the underdense plasma produced as a rarefaction wave causes the overdense plasma generated by the laser pulse to expand. Therefore, the laser parameters and foil thickness must be carefully optimized to produce an efficient 3.7 to 4.3 keV X-ray source. Otherwise, the rarefaction waves from both sides of the thin foil may suppress multi-keV X-ray emission. This study represents an important advancement in the development of an efficient multi-keV L-shell-band X-ray source.
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Zhang S, Li J, Krauland CM, Beg FN, Muller S, Theobald W, Palastro J, Filkins T, Turnbull D, Haberberger D, Ren C, Betti R, Stoeckl C, Campbell EM, Trela J, Batani D, Scott RHH, Wei MS. Pump-depletion dynamics and saturation of stimulated Brillouin scattering in shock ignition relevant experiments. Phys Rev E 2021; 103:063208. [PMID: 34271736 DOI: 10.1103/physreve.103.063208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Accepted: 05/19/2021] [Indexed: 11/07/2022]
Abstract
As an alternative inertial confinement fusion scheme, shock ignition requires a strong converging shock driven by a high-intensity laser pulse to ignite a precompressed fusion capsule. Understanding nonlinear laser-plasma instabilities is crucial to assess and improve the laser-shock energy coupling. Recent experiments conducted on the OMEGA EP laser facility have demonstrated that such instabilities can ∼100% deplete the first 0.5 ns of the high-intensity laser. Analyses of the observed laser-generated blast wave suggest that this pump-depletion starts at ∼0.02 critical density and progresses to 0.1-0.2 critical density, which is also confirmed by the time-resolved stimulated Raman backscattering spectra. The pump-depletion dynamics can be explained by the breaking of ion-acoustic waves in stimulated Brillouin scattering. Such pump depletion would inhibit the collisional laser energy absorption but may benefit the generation of hot electrons with moderate temperatures for electron shock ignition [Phys. Rev. Lett. 119, 195001 (2017)PRLTAO0031-900710.1103/PhysRevLett.119.195001].
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Affiliation(s)
- S Zhang
- Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, California 92093, USA
| | - J Li
- Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, California 92093, USA
| | - C M Krauland
- Inertial Fusion Technology, General Atomics, San Diego, California 92121, USA
| | - F N Beg
- Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, California 92093, USA
| | - S Muller
- Inertial Fusion Technology, General Atomics, San Diego, California 92121, USA
| | - W Theobald
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - J Palastro
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - T Filkins
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - D Turnbull
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - D Haberberger
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - C Ren
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.,Department of Mechanical Engineering, University of Rochester, Rochester, New York 14623, USA
| | - R Betti
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.,Department of Mechanical Engineering, University of Rochester, Rochester, New York 14623, USA
| | - C Stoeckl
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - E M Campbell
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - J Trela
- Centre Lasers Intenses et Applications, CELIA, Université de Bordeaux CEA-CNRS, 33405 Talence, France
| | - D Batani
- Centre Lasers Intenses et Applications, CELIA, Université de Bordeaux CEA-CNRS, 33405 Talence, France
| | - R H H Scott
- Central Laser Facility, STFC Rutherford Appleton Laboratory, Harwell Oxford, Didcot OX11 0QX, United Kingdom
| | - M S Wei
- Inertial Fusion Technology, General Atomics, San Diego, California 92121, USA.,Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
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Theobald W, Sorce C, Donaldson WR, Epstein R, Keck RL, Kellogg C, Kessler TJ, Kwiatkowski J, Marshall FJ, Sampat S, Seka W, Shah RC, Shvydky A, Stoeckl C, Waxer LJ, Regan SP. Inferred UV fluence focal-spot profiles from soft x-ray pinhole-camera measurements on OMEGA. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2020; 91:023505. [PMID: 32113463 DOI: 10.1063/1.5120708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Accepted: 01/14/2020] [Indexed: 06/10/2023]
Abstract
A method was developed with laser-irradiated Au planar foils to characterize the focal spot of UV laser beams on a target at full energy from soft x-ray emission. A pinhole camera with a back-thinned charge-coupled device detector and filtration with thin Be and Al foil filters provides images of the x-ray emission at photon energies <2 keV. This method requires a careful measurement of the relationship between the applied UV fluence and the x-ray signal, which can be described by a power-law dependence. The measured exponent γ ∼ 2 provides a dynamic range of ∼25 for the inferred UV fluence. UV fluence profiles of selected beams were measured for 100-ps and 1-ns laser pulses and were compared to directly measured profiles from an UV equivalent-target-plane diagnostic. The inferred spot size and super-Gaussian order from the x-ray technique agree within several percent with the values measured with the direct UV measurements.
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Affiliation(s)
- W Theobald
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - C Sorce
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - W R Donaldson
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - R Epstein
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - R L Keck
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - C Kellogg
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - T J Kessler
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - J Kwiatkowski
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - F J Marshall
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - S Sampat
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - W Seka
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - R C Shah
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - A Shvydky
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - C Stoeckl
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - L J Waxer
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - S P Regan
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
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Joshi A. Determination of self generated magnetic field and the plasma density using Cotton Mouton polarimetry with two color probes. EPJ WEB OF CONFERENCES 2013. [DOI: 10.1051/epjconf/20135913010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Petrasso RD, Li CK, Seguin FH, Rygg JR, Frenje JA, Betti R, Knauer JP, Meyerhofer DD, Amendt PA, Froula DH, Landen OL, Patel PK, Ross JS, Town RPJ. Lorentz mapping of magnetic fields in hot dense plasmas. PHYSICAL REVIEW LETTERS 2009; 103:085001. [PMID: 19792731 DOI: 10.1103/physrevlett.103.085001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2009] [Indexed: 05/28/2023]
Abstract
Unique detection of electromagnetic fields and identification of field type and strength as a function of position were used to determine the nature of self-generated fields in a novel experiment with laser-generated plasma bubbles on two sides of a plastic foil. Field-induced deflections of monoenergetic 15-MeV probe protons passing through the two bubbles, measured quantitatively with proton radiography, were combined with Lorentz mapping to provide separate measurements of magnetic and electric fields. The result was absolute identification and measurement of a toroidal magnetic field around each bubble and determination that any electric field component parallel to the foil was below measurement uncertainties.
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Affiliation(s)
- R D Petrasso
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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Bendib A, Bendib-Kalache K, Gombert MM, Imadouchene N. Generalized linear transport theory in dilute neutral gases and dispersion relation of sound waves. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2006; 74:041204. [PMID: 17155048 DOI: 10.1103/physreve.74.041204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2006] [Indexed: 05/12/2023]
Abstract
The transport processes in dilute neutral gases are studied by using the kinetic equation with a collision relaxation model that meets all conservation requirements. The kinetic equation is solved keeping the whole anisotropic part of the distribution function with the use of the continued fractions. The conservative laws of the collision operator are taken into account with the projection operator techniques. The generalized heat flux and stress tensor are calculated in the linear approximation, as functions of the lower moments, i.e., the density, the flow velocity and the temperature. The results obtained are valid for arbitrary collision frequency nu with the respect to kv(t) and the characteristic frequency omega, where k(-1) is the characteristic length scale of the system and v(t) is the thermal velocity. The transport coefficients constitute accurate closure relations for the generalized hydrodynamic equations. An application to the dispersion and the attenuation of sound waves in the whole collisionality regime is presented. The results obtained are in very good agreement with the experimental data.
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Affiliation(s)
- A Bendib
- Laboratoire d'Electronique Quantique, Faculté de Physique, USTHB, El Alia BP 32, Bab Ezzouar 16111, Algiers, Algeria
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Gregori G, Glenzer SH, Knight J, Niemann C, Price D, Froula DH, Edwards MJ, Town RPJ, Brantov A, Rozmus W, Bychenkov VY. Effect of nonlocal transport on heat-wave propagation. PHYSICAL REVIEW LETTERS 2004; 92:205006. [PMID: 15169364 DOI: 10.1103/physrevlett.92.205006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2003] [Indexed: 05/24/2023]
Abstract
We present the first direct measurements of spatially and temporally resolved temperature and density profiles produced by nonlocal transport in a laser plasma. Absolutely calibrated measurements have been performed by Rayleigh scattering and by resolving the ion-acoustic wave spectra across the plasma volume with Thomson scattering. We find that the electron temperature and density profiles disagree with flux-limited models, but are consistent with nonlocal transport modeling.
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Affiliation(s)
- G Gregori
- Lawrence Livermore National Laboratory, University of California, PO Box 808, California 94551, USA
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Vick D, Kado M, Yamamoto H, Tanaka KA, Offenberger AA, Capjack CE, Nishiguchi A, Mima K, Nakai S. Lateral energy transport in laser-produced plasmas. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1995; 52:6692-6702. [PMID: 9964186 DOI: 10.1103/physreve.52.6692] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Drake RP, Bradley KS, Batha SH, Baldis HA, Montgomery DS, Estabrook K, Kruer WL, Procassini RJ. Multiangle, time-resolved spectroscopy of laser-light scattering in underdense, inhomogeneous laser plasmas. PHYSICAL REVIEW LETTERS 1995; 74:3157-3160. [PMID: 10058126 DOI: 10.1103/physrevlett.74.3157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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