1 Hz fast-heating fusion driver HAMA pumped by a 10 J green diode-pumped solid-state laser

Mori, Yoshitaka; Sekine, Takashi; Komeda, Osamu; Nakayama, S.; Ishii, Katsuhiro; Hanayama, Ryohei; Fujita, Kazuhisa; Okihara, S.; Satoh, N.; Kitahara, Takashi; Kawashima, Toshiyuki; Kan, Hirofumi; Nakamura, Naoki; Kondo, Takuya; Fujine, Manabu; Azuma, Hirozumi; Hioki, Tatsumi; Kakeno, Mitsutaka; Tagaya, Motohiro; Nishimura, Yasumasa; Sunahara, A.; Sentoku, Y.; Kitagawa, Yoneyoshi

doi:10.1088/0029-5515/53/7/073011

Cited by 24 publications

(9 citation statements)

References 20 publications

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“…We observed channel formation through the free-falling pellets, which might be the evidence to support a scheme for fast ignition. On an average, approximately 20% of the pellets were irradiated with the HAMA laser11. Neutrons more than 1.0 × 10 4 /4 π sr were observed for 2.5% of these pellets.…”

Section: Resultsmentioning

confidence: 99%

First demonstration of laser engagement of 1-Hz-injected flying pellets and neutron generation

Komeda

Nishimura²,

Mori

et al. 2013

Sci Rep

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Pellet injection and repetitive laser illumination are key technologies for realizing inertial fusion energy. Numerous studies have been conducted on target suppliers, injectors, and tracking systems for flying pellet engagement. Here we for the first time demonstrate the pellet injection, counter laser beams' engagement and neutron generation. Deuterated polystyrene (CD) bead pellets, after free-falling for a distance of 18 cm at 1 Hz, are successfully engaged by two counter laser beams from a diode-pumped, ultra-intense laser HAMA. The laser energy, pulse duration, wavelength, and the intensity are 0.63 J per beam, 104 fs, and 811 nm, 4.7 × 1018 W/cm2, respectively. The irradiated pellets produce D(d,n)3He-reacted neutrons with a maximum yield of 9.5 × 104/4π sr/shot. Moreover, the laser is found out to bore a straight channel with 10 μm-diameter through the 1-mm-diameter beads. The results indicate potentially useful technologies and findings for the next step in realizing inertial fusion energy.

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Section: Resultsmentioning

confidence: 99%

First demonstration of laser engagement of 1-Hz-injected flying pellets and neutron generation

Komeda

Nishimura²,

Mori

et al. 2013

Sci Rep

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“…The experiments were performed on a titanium:sapphire laser system, called 'HAMA', which was pumped by a 10 J green diode-pumped solid-state laser. Figure 1(a) shows the HAMA laser system [21,22], which consisted of a titanium:sapphire laser system, called 'BEAT', [23,24] as a seed and a diodepumped solid state laser, called the 'KURE-1' laser system [25], as a pump. The HAMA laser system was amplified by the second harmonics of the KURE-1 laser.…”

Section: Laser System and Laser-driven Pressurementioning

confidence: 99%

Modification of single-crystalline yttria-stabilised zirconia induced by radiation heating from laser-produced plasma

Mori

Sunahara

Nishimura

et al. 2019

J. Phys. D: Appl. Phys.

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Thermal modifications induced by intense laser pulse irradiation of a material surface are studied. Single-crystalline yttria-stabilised zirconia (YSZ) is irradiated with Joule-class intense laser pulses with three focal intensities of 10 12 , 10 13 , and 10 17 W cm −2 at pulse durations of 15 ns, 300 ps and 110 fs, respectively. The physical surface properties of the irradiated YSZ are determined using an optical digital microscope, a scanning electron microscope and x-ray diffraction methods. In all three cases, a linear scratch pattern along the crystal orientation on the YSZ surface is found, which surrounds the laser irradiation spot area (diameter: 60 µm). In the 15 ns case, the focal spot area is polycrystallised with a tensile residual stress of 0.45 ± 0.05 GPa. However, the linear scratch pattern of 1.8 mm in diameter remains in the single-crystalline phase of YSZ, having a residual stress below the detection limit. A two-dimensional radiation-hydrodynamic simulation reveals that a radiative plasma source generated on the focal spot by the laser irradiation ablates the material surface. A region of approximately 1.4 mm in diameter is affected by an ion temperature beyond 0.25 eV; hence, ablation of the material surface to a thickness of 1 µm order is observed. The diameter of this simulated ablation region is consistent with that of the linear scratch patterns observed in the experiments to within a factor 1.3. The findings of this study indicate that a large area relative to the laser focal area can be modified by radiation heating in a laser-induced material

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“…Исследование работы пневматического инжектора при криогенных температурах и анализ проблемы загрязнения камеры посторонним газом позволят при-нять окончательное решение о применимости пневматического инжектора в реакторах ИТС; -мини-реактор для отработки реакторных технологий. В Японии в рамках создания мини-реактора (программа CANDY) построен неодимовый лазер HAMA с диодной накачкой, c помощью которого впервые экспериментально продемонстрировано синхронное облучение сферических оболочек с частотой 1 Гц и зафиксирован выход термоядерных нейтронов [9,10,132]. Ввод оболочек в камеру осуществлялся при комнатной температуре с помощью гравитационной инжекции.…”

Section: реакторные технологииunclassified

Cryogenic Hydrogen Fuel for Controlled Inertial Confinement Fusion (Review of World Results)

Александрова¹,

Koresheva²,

Крохин³

et al. 2015

PAST-TF

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Характерная особенность текущего этапа в развитии управляемого инерциального термоядерного синтеза (ИТС) -создание научной и технологической базы для высокочастотной подачи криогенного водородного топлива в фокус мощной лазерной установки или реактора ИТС. Основные проблемы здесь связаны с разработкой технологии массового производства топливных мишеней и необходимостью их инжекции в камеру реактора с частотой 1-10 Гц. В обзоре дан сравнительный анализ совре-менного состояния работ в мире в этой области. Представлены результаты большого цикла экспериментальных и теоретиче-ских исследований, продемонстрировавших, что в России создан опережающий научно-технологический задел для построения первой в мире опытной установки (так называемой «Фабрики мишеней») для непрерывного пополнения криогенным водород-ным топливом зоны термоядерного горения реактора ИТС.Ключевые слова: инерциальный термоядерный синтез (ИТС), водородное топливо, криогенная мишень, ультрадисперсный слой топлива. CRYOGENIC HYDROGEN FUEL FOR CONTROLLED INERTIAL CONFINEMENT FUSION (REVIEW OF WORLD RESULTS)I.V. One of the major tasks in controlled inertial confinement fusion (ICF) now is the development of scientific, engineering and technological basis for mass production of cryogenic hydrogen fuel encapsulated in ICF targets. To demonstrate ICF as a power source, the targets must be accurately delivered to the focus of a power laser facility or ICF reactor at a rate of 1-10 Hz. In this paper, a comparative analysis of state-of-the-art in the world in the field of target fabrication and transport in the ICF systems is presented. The paper also summarizes the results of theoretical and experimental efforts in Russia and describes a unique free-standing (FST) fabrication technology, which can serve as a basis for ICF reactor fueling. Now there is an advanced scientific and technological groundwork for designing and building of the world's first target FST factory for a pilot ICF-plant with continuous delivery of the cryogenic hydrogen fuel into the ICF burn area.Key words: inertial confinement fusion (ICF), hydrogen fuel, cryogenic target, ultrafine fuel layer. ВВЕДЕНИЕНа сегодняшний день использование энергии инерциального термоядерного синтеза (ИТС) явля-ется одной из приоритетных задач в рамках концепции устойчивого развития и перехода к альтерна-тивным источникам энергии в базовой энергетике страны. Поэтому в современных исследованиях ак-туальной проблемой становится разработка энергетической станции на основе ИТС, которая могла бы обеспечить получение энергии за счёт реакций синтеза изотопов водорода -дейтерия и трития. Ис-ходным топливом для термоядерного реактора служат вода и литий, запасы которых практически не ограничены.В качестве источника энергии для нагрева и сжатия криогенной топливной мишени (полая поли-мерная оболочка со сферическим шаровым слоем криогенного водородного топлива на её внутренней поверхности) используется специальный драйвер -лазер, источник ионных пучков или Z-пинч. Отме-тим, что начало инерциальному подходу положила работа...

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1 Hz fast-heating fusion driver HAMA pumped by a 10 J green diode-pumped solid-state laser

Cited by 24 publications

References 20 publications

First demonstration of laser engagement of 1-Hz-injected flying pellets and neutron generation

First demonstration of laser engagement of 1-Hz-injected flying pellets and neutron generation

Modification of single-crystalline yttria-stabilised zirconia induced by radiation heating from laser-produced plasma

Cryogenic Hydrogen Fuel for Controlled Inertial Confinement Fusion (Review of World Results)

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