Studies of ultra-intense laser plasma interactions for fast ignition

Tanaka, K. A.; Kodama, R.; Fujita, Hisanori; Heya, Manabu; Izumi, N.; Kato, Yoshiaki; Kitagawa, Yoneyoshi; Mima, Kunioki; Miyanaga, Noriaki; Norimatsu, T.; Pukhov, A.; Sunahara, Atsushi; Takahashi, Koji; Allen, M.; Habara, H.; Iwatani, T.; Matusita, Tomohiro; Miyakosi, T.; Mori, M.; Setoguchi, H.; Sonomoto, T.; Tanpo, M.; Tohyama, S.; Azuma, Hirozumi; Kawasaki, T.; Komeno, T.; Maekawa, O.; Matsuo, S.; Shozaki, T.; Suzuki, Ka; Yoshida, H. P.; Yamanaka, Tatsuhiko; Sentoku, Y.; Weber, F.; Barbee, Troy W.; DaSilva, L.

doi:10.1063/1.874023

Cited by 112 publications

(44 citation statements)

References 23 publications

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“…2 Direct heating method (super-penetration) is one such method owing to the simple target and laser geometry. 3 In this scheme, ultraintense laser pulse (UILP) irradiates an imploded plasma directly and propagates into the corona region with relativistic self-focusing (RSF). When the UILP reaches critical density surface, relativistic induced transparency (RIT) allows the pulse to propagate as a single channel up to critical 4 or 10 times critical density.…”

Section: Introductionmentioning

confidence: 99%

Collimated fast electron beam generation in critical density plasma

et al. 2014

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Significantly collimated fast electron beam with a divergence angle 10° (FWHM) is observed when an ultra-intense laser pulse (I = 1014 W/cm2, 300 fs) irradiates a uniform critical density plasma. The uniform plasma is created through the ionization of an ultra-low density (5 mg/c.c.) plastic foam by X-ray burst from the interaction of intense laser (I = 1014 W/cm2, 600 ps) with a thin Cu foil. 2D Particle-In-Cell (PIC) simulation well reproduces the collimated electron beam with a strong magnetic field in the region of the laser pulse propagation. To understand the physical mechanism of the collimation, we calculate energetic electron motion in the magnetic field obtained from the 2D PIC simulation. As the results, the strong magnetic field (300 MG) collimates electrons with energy over a few MeV. This collimation mechanism may attract attention in many applications such as electron acceleration, electron microscope and fast ignition of laser fusion.

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Section: Introductionmentioning

confidence: 99%

Collimated fast electron beam generation in critical density plasma

et al. 2014

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“…4-7 A precise physical understanding of the MeV electron production and transport in dense plasma is crucial for the success of the fast-ignition concept. This has triggered vigorous research effort in both experimental [8][9][10][11][12] and theoretical studies. [13][14][15][16] Strong laser self-generated magnetic and electric fields influence the transport of relativistic electrons in high-energy-density plasmas.…”

Section: Introductionmentioning

confidence: 99%

Hot surface ionic line emission and cold K-inner shell emission from petawatt-laser-irradiated Cu foil targets

Theobald¹,

Akli²,

Clarke³

et al. 2006

Physics of Plasmas

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A hot, T e ~ 2-to 3-keV surface plasma was observed in the interaction of a 0.7-ps petawatt laser beam with solid copper-foil targets at intensities >10 20 W/cm 2 . Copper K-shell spectra were measured in the range of 8 to 9 keV using a single-photon-counting x-ray CCD camera. In addition to K α and K β inner-shell lines, the emission contained the Cu He α and Ly α lines, allowing the temperature to be inferred. These lines have not been observed previously with ultrafast laser pulses. For intensities less than 3 × 10 18 W/cm 2 , only the K α and K β inner-shell emissions are detected. Measurements of the absolute K α yield as a function of the laser intensity are in agreement with a model that includes refluxing and confinement of the suprathermal electrons in the target volume.2

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“…troscopy, nuclear activation, Bremsstrahlung, buried fluorescent foils, proton emission, and coherent transition radiation [5][6][7][8][9]. Filter stack technique uses differential filtering to discriminate the γ-ray spectrum [10,11].…”

Section: Inroductionmentioning

confidence: 99%

Development of Compton X-Ray Spectrometer for Fast Ignition Experiment<sup> </sup>

Kojima

Arikawa

Ikenouchi

et al. 2014

Plasma and Fusion Research

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In the context of Fast Ignition, the fast electron temperature is a key parameter to determine the laserto-fast electron energy conversion efficiency. Bremsstrahlung X-ray (γ-ray) emission represents an attractive alternative to measure this fundamental parameter. In this study, a single-shot high-energy γ-ray spectrometer with sensitivity ranging from 0.5 MeV to 7 MeV was developed, allowing to estimate the γ-ray spectrum in the fast ignition. Keywords: fast ignition, inertial confinement fusion, fast electron, x-ray spectrometer, filter stack spectrometer DOI: 10.1585/pfr.9.4405109 InroductionFast Ignition (FI) is an alternative approach to Inertial Confinement Fusion, consisting in the separation of the compression and heating stages. In FI, the heating of the compressed Deuterium-Tritium (DT) fuel is produced by a ultra-high intensity laser-generated fast electron beam depositing its energy in the high density plasma by Coulomb interaction. The coupling efficiency is strongly dependent on the fast electron energy distribution, therefore representing a crucial parameter to be diagnosed [1]. From simulations, in order to ignite a compressed DT pellet having density of 300 g/cm 3 , 18 kJ of fast electron energy has to be deposited within a diameter of 40 µm in the compressed fuel. Fast electrons in the 1-3 MeV energy range are responsible for the energy deposition in such a small volume, allowing for the creation of a lateral hot spot. Thus high conversion efficiency into 1-3 MeV energy range fast electrons is fundamental for the achievement of Fast Ignition [2][3][4]. However, it is difficult to measure initial fast electron temperature from the outside of plasma because of the strong sheath potential around the target. The bremsstrahlung X-ray is an attractive alternative diagnostic for this aim. In previous works, many kind of γ-ray detectors with different sensitivities have been developed. Various techniques have been adopted to measure the fast electron energy spectrum, such as vacuum electron specauthor's e-mail: kojima-s@ile.osaka-u.ac.jp * ) This article is based on the presentation at the Conference on Laser and Accelerator Neutron Source and Applications (LANSA '13).troscopy, nuclear activation, Bremsstrahlung, buried fluorescent foils, proton emission, and coherent transition radiation [5][6][7][8][9]. Filter stack technique uses differential filtering to discriminate the γ-ray spectrum [10,11]. The spectrometer consists of thirteen filters of increasing Z, five 100 µm thick filters Al, Ti, Fe, Cu and Mo, followed by 150 µm Ag, 500 µm Sn and Ta filters, and one 1.58 mm Au filter. Finally four Pb filters with thickness varying from 1 mm to 4 mm for differential filtering are positioned in the stack. Nuclear activation technique uses photo nuclear activation to discriminate the γ-ray spectrum. In this method, γ-ray spectrum is measured from the activation ratio of a pseudo- . However, observable energy range of these two detectors are respectively up to 0.5 keV and above 7 MeV, respectively. Thus, ...

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Studies of ultra-intense laser plasma interactions for fast ignition

Cited by 112 publications

References 23 publications

Collimated fast electron beam generation in critical density plasma

Collimated fast electron beam generation in critical density plasma

Hot surface ionic line emission and cold K-inner shell emission from petawatt-laser-irradiated Cu foil targets

Development of Compton X-Ray Spectrometer for Fast Ignition Experiment<sup> </sup>

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