| Paper | Title | Page |
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| TUMBCMO23 | Development and New Perspectives on the LMJ Power Conditioning Modules | 415 |
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The Laser MegaJoule (LMJ), a 176-beam laser French facility, located at the CEA* CESTA close to Bordeaux is part of the French Simulation Program, for improvement of theoretical models, high performance numerical simulations and experimental validations. It is designed to deliver about 1.4 MJ of energy on targets, for plasma and fusion experiments. With 15 bundles operational at the end of 2023, the operational capabilities are increasing gradually until the full completion of the LMJ facility by 2025. With the increasing of the Power Conditioning Modules (PCM), it has been observed more and more instabilities in the synchronization and the repeatability of the PCM’s triggering. For experiments based on 10 or more bundles, it has resulted in the issue of coupling the LMJ bundles with the PETAL laser and in the safety shutdown of the PCM due to the timeout of capacitors under high voltage. In this paper, a description of the LMJ PCM is first given. Then, the considered problem is presented with a detailed analysis and the software solution is finally presented with experimental results showing the gain in the reliability and effectiveness of the PCM during the LMJ-PETAL shots.
* CEA : Commissariat à l Energie Atomique et aux Energies Alternatives |
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Slides TUMBCMO23 [2.897 MB] | |
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Poster TUMBCMO23 [0.941 MB] | |
| DOI • | reference for this paper ※ doi:10.18429/JACoW-ICALEPCS2023-TUMBCMO23 | |
| About • | Received ※ 29 September 2023 — Revised ※ 08 October 2023 — Accepted ※ 28 November 2023 — Issued ※ 09 December 2023 | |
| Cite • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |
| TUPDP010 | The Laser Megajoule Facility Status Report | 498 |
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The Laser MegaJoule, a 176-beam laser facility developed by CEA, is located near Bordeaux. It is part of the French Simulation Program, which combines improvement of theoretical models used in various domains of physics and high performance numerical simulation. It is designed to deliver about 1.4 MJ of energy on targets, for high energy density physics experiments, including fusion experiments. The LMJ technological choices were validated on the LIL, a scale-1 prototype composed of 1 bundle of 4-beams. The first bundle of 8-beams was commissioned in October 2014 with the realisation of the first experiment on the LMJ facility. The operational capabilities are increasing gradually every year until the full completion by 2025. By the end of 2023, 18 bundles of 8-beams will be assembled and 15 bundles are expected to be fully operational. In this paper, a presentation of the LMJ Control System architecture is given. A description of the integration platform and simulation tools, located outside the LMJ facility, is given. Finally, a review of the LMJ status report is detailed with an update on the LMJ and PETAL activities.
LMJ: Laser MegaJoule CEA: Commissariat à l’Energie Atomique et aux Energies Alternatives LIL : Ligne d’Intégration Laser |
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Poster TUPDP010 [1.200 MB] | |
| DOI • | reference for this paper ※ doi:10.18429/JACoW-ICALEPCS2023-TUPDP010 | |
| About • | Received ※ 28 September 2023 — Revised ※ 08 October 2023 — Accepted ※ 28 November 2023 — Issued ※ 08 December 2023 | |
| Cite • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |
| TUPDP011 | The Laser Megajoule Full Automated Sequences | 504 |
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The LMJ*, a 176-beam laser facility developed by the French Nuclear Science directorate CEA, is located at the CEA** CESTA site near Bordeaux. The LMJ facility is part of the French Simulation Program. It is designed to deliver about 1.4 MJ of energy on targets, for high energy density physics experiments, including fusion experiments. Since 2022, the LMJ facility aims at carrying out experiments with 12 bundles of 8 laser beams and 12 target diagnostics. In order to achieve daily shots including all the preparatory steps, the LMJ performs night activities from now on and the presence of technical operators is not required. These sequences work on vacuum windows inspection and beam alignment. They take into account all the prerequisites for their good performances and are scheduled automatically one after the other. They deal with material security and unexpected equipment alarms. They endeavour to required tasks success and give a detailed report of the night events to the shot director. This paper gives a presentation of the two sequences with solutions in order to answer the technical specifications and the last enhancements.
*LMJ: Laser MegaJoule **CEA: Commissariat à l’Energie Atomique et aux Energies Alternatives |
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Poster TUPDP011 [0.771 MB] | |
| DOI • | reference for this paper ※ doi:10.18429/JACoW-ICALEPCS2023-TUPDP011 | |
| About • | Received ※ 02 October 2023 — Revised ※ 08 October 2023 — Accepted ※ 29 November 2023 — Issued ※ 19 December 2023 | |
| Cite • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |