Métrologie des faisceaux et de la tache focale de la LIL

Garrec, B. Le; Di-Nicola, Jean-Michel; Beau, V.

doi:10.1051/jp4:2006138034

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…The LIL focal spot has been carefully recorded during the commissioning campaign and details of the focal spot diagnostics can be found in [1,3]. The reference profile for the quad focal spot is taken from the 5 shot recording shown in figure 4.…”

Section: Lil Focal Spot Resultsmentioning

confidence: 99%

The design of LMJ focal spots for indirect drive experiments

Garrec¹,

Sajer²

2008

J. Phys.: Conf. Ser.

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Abstract. LMJ is a 240 high power laser beam facility for achieving laser matter interaction experiments, high energy density science, including the demonstration of fusion ignition through Inertial Confinement. The Laser Integration Line (LIL) facility is currently a 4-beam prototype for LMJ. The intensity I 0 at the focal spot centre drives hydrodynamic and plasma instabilities and the intensity in the wings must be low to go through the laser entrance Hohlraum. A simple model has been developed to compute the LMJ focal spot. The model gives the intensity at the centre as a function of the focal spot area at 3% of the maximum. IntroductionThe Laser Integration Line (LIL) facility is currently a 4-beam prototype for LMJ. The purpose of LIL and of these experiments is to show that the previously untested features of the LMJ laser design will perform as projected at LMJ scale and that the laser is therefore ready for final engineering design. LIL Quad beam waist was recorded for various pulse durations, smoothing techniques and for a wide range of laser intensities up to LMJ-nominal ones [1]. Now, LIL quad has been commissioned to the center of the target chamber and the first plasma experiments are being made.LMJ focal spot requirements are : elliptic shape, almost flat top high-order super-gaussian envelope, spot size, intensity at the center. In fact, it is important to know precisely the intensity I 0 at the focal spot center (to control hydrodynamic and plasma instabilities) and the intensity at the edges of the focal spot (to go through the laser entrance Hohlraum). For LMJ focal spots, it has been decided that this level will be 3 % of I 0 .

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Section: Lil Focal Spot Resultsmentioning

confidence: 99%

The design of LMJ focal spots for indirect drive experiments

Garrec¹,

Sajer²

2008

J. Phys.: Conf. Ser.

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“…This energy is deposited along the different stages (foot, compression and shock). The compression is the most demanding stage accounting for 75% [12] of the deposited laser energy. The remaining 25% will be mostly deposited during the shock stage.…”

Section: Hiper Final Lenses: Design Conditionsmentioning

confidence: 99%

Transmission final lenses in the HiPER laser fusion power plant: system design for temperature control

Páramo¹,

Sordo²,

Garoz³

et al. 2014

Nucl. Fusion

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The European laser fusion project HiPER is developing technologically feasible components for a laser fusion power plant with an evacuated dry wall chamber which is likely to operate with a shock ignition scheme and direct targets. One of the key components is the final optics. In this work, we consider silica transmission final lenses and address the major issues regarding the unavoidable neutron irradiation they must withstand. For pre-commercial power plants (150 MJ target yield at 10 Hz) a distance of 16 m between the final lenses and target leads to maximum lens temperatures within tolerable limits. However, a non-uniform steady-state temperature profile is a major concern because it is the origin of unacceptable aberrations that severely affect the target spots. We have devised an active intervention system based on a heat-transfer fluid to keep the temperature profile as smooth as possible. The main characteristics of the temperature control system are defined throughout this work and enable the operation of the plant, both for the start-up procedure and for normal operation.

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Laser Megajoule performance status

Neauport,

Airiau,

Beck

et al. 2024

Appl. Opt.

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The Laser Megajoule (LMJ) is among the most energetic inertial confinement fusion laser facilities in the world, together with the National Ignition Facility (NIF) in the USA. The construction of the facility began back in 2003, and the first photons were emitted by the laser bundle #28 in 2014. Today, 11 laser bundles consisting of 88 large aperture 0.35×0.35m2 laser beams are in operation, delivering daily up to 330 kJ of energy at the wavelength of 351 nm on a target placed in the center of a 10 m diameter vacuum chamber. In this paper, we describe the laser system and its operational performances. We also detail the first laser campaigns carried out to prepare an increase of energy and power on the target. These campaigns, along with the completion of additional bundles mounting, will bring LMJ performance to 1.3 MJ thanks to 22 bundles in operation.

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Métrologie des faisceaux et de la tache focale de la LIL

Cited by 4 publications

References 8 publications

The design of LMJ focal spots for indirect drive experiments

The design of LMJ focal spots for indirect drive experiments

Transmission final lenses in the HiPER laser fusion power plant: system design for temperature control

Laser Megajoule performance status

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