Mr. Yannick Schiano Profile

Yannick Schiano

at Commissariat à l'Énergie Atomique

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Proceedings Article | 16 May 2007 Paper

Target alignment on the LIL laser facility

Mélanie Mangeant, Jean-Luc Dubois, Raphaël André, Philippe Dupont, Vanessa Moreau, Catherine Lissayou, Catherine Lanternier, Emmanuel Bar, Sebastien Devaure, Arnaud Perrin, Patrick Auliac, Yannick Schiano

Proceedings Volume 6584, 65840M (2007) https://doi.org/10.1117/12.739393

KEYWORDS: Optical fibers, CCD cameras, Plasma diagnostics, Calibration, Charge-coupled devices, 3D acquisition, Plasma, Diagnostics, Laser beam diagnostics, Laser development

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One way to achieve fusion in laboratory consists in heating and compressing, by using a laser, a capsule containing a deuterium - tritium mix. Achievement of such a project can be obtained only through the development of a new generation of laser facilities. With this end in view, CEA is developing the "Laser Mega-Joule" (LMJ), a facility made of 240 laser lines. The "Ligne d'Intégration Laser" (LIL) is a prototype of the LMJ made of a four laser lines assembly. Presently operational, it must permit the validation of the technological choices that have been made. Particular attention must be given in the achievement of the alignment of the target compared with the laser beams: it must be positioned at the center of the target chamber with a precision better than fifty micrometers rms. The quality of this alignment must be guaranteed in order to ensure the success of the physics experiments performed on the facility. We are presenting the device that has been devised to reach this objective: the "Système de Visualisation de Cible" (SYVIC) or target viewing system. This device is made of two optical visors set on the target chamber, associated with a complicated three-dimensional reconstruction algorithm. It permits to position an object at the center of the chamber, rapidly and with the required orientation. It also makes possible the alignment of all the plasma diagnostics, mounted on the chamber wall in order to study the plasma created by the laser-matter interaction. The first plasma experiment using the SYVIC alignment device took place at the beginning of 2007 with a specific target. Doing so we qualified the accuracy of this device and its implementation on LIL.

Proceedings Article | 16 May 2007 Paper

Time fiducial on the LIL facility at CEA/CESTA

Yannick Schiano, Emmanuel Bar, André Richard, Christophe Feral, Patrick Darquey

Proceedings Volume 6584, 65840N (2007) https://doi.org/10.1117/12.739401

KEYWORDS: Streak cameras, Diagnostics, Laser marking, Picosecond phenomena, Diodes, Laser development, Prototyping, Oscilloscopes, Semiconductor lasers, Plasma

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The CEA is currently developing the "Laser Mega Joule "(LMJ), a facility capable of concentrating an extremely high quantity of energy from 240 laser beams on a micro target for a brief moment. The characteristics of the facility have been defined to obtain the temperature and pressure conditions required to reach thermonuclear combustion. The "Ligne d'Intégration Laser" (LIL) is a facility designed to validate the choices adopted for the LMJ. It consists of a basic laser line from the MJL with four identical beams. On the LIL, an experiment consists of a series of laser/material interaction firings. For a given firing, there is a concatenation of the phenomena from the triggering of the physical mechanisms to the recording of the signals on the recording instruments (diagnostics). The interaction gives rise to plasma. One sure method to enable the reconstruction of the events in the course of the experiments involves recording an optic time fiducial signal on the main instruments. This temporary marking makes it possible to reposition in time the signals recorded on the measuring instruments against a point of reference. We present here a prototype that has been developed for the time fiducial of the visible streak cameras : "SYMOD : SYstème de Marquage Optique par Diode laser". The original architecture of the bench is based on the use of one laser diode per diagnosis to be marked. Other components, including synchronization equipment and two chronometry arrays, are arranged around this source which constitutes the main component of the device. Tests have been run to validate the technical choice of the source and to demonstrate that the main time requirements concerning the fiducial are met (rise time < 50ps and time jitter < 16ps rms).

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