Scalability of High Power KrF Lasers for ICF Driver

Ueda, Ken–ichi; Takuma, Hiroshi

doi:10.1007/978-3-642-74088-6_23

Cited by 5 publications

(2 citation statements)

References 15 publications

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“…EaT4 0 = ,c-jT(x,t) -1--10 jIEt --i-. (2) This nonlinear equation was solved numerically. Cooling by the support bar was incorporated by the boundary condition of the water temperature.…”

Section: A Hibachi Structurementioning

confidence: 99%

Electron-beam-pumped high-repetition-rate KrF laser system

Takahashi¹,

Okuda²,

Matsushima³

et al. 2000

SPIE Proceedings

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A repetition-rate electron beam pumped KrF laser amplifier is being built at the Electrotechnical Laboratory to develop the technologies required for an inertial confinement fusion energy driver. The pulsed power system of the prototype amplifier has already been completed and generates pulses of -300kV, 8Ons with a repetition-rate of 1Hz. The high voltage electric short pulses are obtained by step-up pulse transformers, magnetic switches and a water dielectric pulse forming line instead of a conventional Marx generator with gap switches. One of the key technologies with this system is the cooling method of pressure and anode foils in a HIBACHI structure to increase those lifetimes. Our design adopts radiation and conduction as the main cooling processes and allows the foils to reach a high temperature. HAVAR and molybdenum are chosen as pressure and anode foil respectively instead of conventional titanium foils. The maximum temperature of the foils were numerically estimated to show the feasibility of the design.

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“…EaT4 0 = ,c-jT(x,t) -1--10 jIEt --i-. (2) This nonlinear equation was solved numerically. Cooling by the support bar was incorporated by the boundary condition of the water temperature.…”

Section: A Hibachi Structurementioning

confidence: 99%

Electron-beam-pumped high-repetition-rate KrF laser system

Takahashi¹,

Okuda²,

Matsushima³

et al. 2000

SPIE Proceedings

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“…This kind of basic research toward fusion energy would greatly benefit from an increased repetition rate of the experiments (Neumayer et al, 2005;Schaumann et al, 2005;Hoffmann et al, 2005;Hora et al, 2005;Jungwirt, 2005). Toward high energy and high power laser, many technique approaches have been taken in various ways, such as diode-pumped laser with gas cooling, electronbeam-pumped gas laser, large-sized ceramic laser, and beam combination laser (Ueda & Takuma, 1987;Kong et al, 1997;Lu et al, 2002). Among these, especially the beam combination technique with stimulated Brillouin scattering phase conjugate mirror (SBS-PCM) has been expected to be the best candidate for practical fusion driver (Kong et al, 1997(Kong et al, , 2005dKappe et al, 2007;Meister et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Laser fusion driver using stimulated Brillouin scattering phase conjugate mirrors by a self-density modulation

et al. 2007

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A new concept of laser fusion driver is proposed, which uses a beam combination technique with stimulated Brillouin scattering phase conjugate mirror (SBS-PCM). It is constructed systematically with a cross-type amplifier as a basic unit. In the first part of this paper, we introduce the cross-type laser amplifier using SBS-PCM, with several advantages by experimental results. These advantages are the ideal properties for practical laser fusion driver, such as the perfect isolation of leak beam, the compensation of thermally induced birefringence through the amplifiers, the easy maintenance and alignment insensitiveness, and the freely-scale-up energy. Next, some successful results for the phase control of SBS-PCM are presented, which is one of the main problems in the current beam combination laser using SBS-PCM. Particularly, a new technique for controlling the phase of SBS-PCM, “self-density modulation,” is introduced, which is the simplest ever among those reported. With the advantages of the cross-type amplifier using SBS-PCM and the novel method for controlling the phase of SBS-PCM, the proposed beam combination laser system is presented as the most promising one, which can contribute to the realization of high energy laser that can operate with high repetition rate over 10 Hz, even in the case of huge output energy over MJ.

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