ICALEPCS2019 - List of Authors (Hocquet, S.)

Paper	Title	Page
MOPHA059	Ultra-High Precision Timing System for the CEA-Laser Megajoule	347
	S. Hocquet, N. Bazoge, Ph. Hours, D. Monnier-Bourdin Greenfield Technology, Massy, France T. Falgon, T. Somerlinck CEA, LE BARP cedex, France
	High power laser such as the Laser MegaJoule (LMJ) or National Ignition Facility (NIF) requires different types of trigger precision to synchronize all the laser beams, plasma diagnostics and generate fiducials. Greenfield Technology, which designs and produces picosecond delay generator and timing system for about 20 years, has been hired by CEA to develop new products to meet the LMJ requirements. About 2000 triggers are about to be set to control and synchronize all of the 176 laser beams on the target with a precision better than 40 ps RMS. Among these triggers, Greenfield Technology’s GFT10¹² is a 4-channels delay generator challenging ultra-high performances: an ultra-low jitter between 2 slaves below 4 ps RMS and a peak-to-peak wander over 1 week lower than 6 ps due to a thermal control of the most sensitive part (the thermal drift is below 1 ps/°C) and specific developments for clock management and restitution. On going investigation should bring the jitter close to 2 ps RMS between 2 slaves.
	Poster MOPHA059 [0.488 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2019-MOPHA059
About •	paper received ※ 30 September 2019 paper accepted ※ 09 October 2019 issue date ※ 30 August 2020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUBPR06	Laser Megajoule Timing System	749
	T. Somerlinck, T. Falgon CEA, LE BARP cedex, France N. Bazoge, S. Hocquet, D. Monnier-Bourdin Greenfield Technology, Massy, France
	The aim of the Laser Megajoule facility (LMJ) is to deliver more than 1 MJ of laser energy to targets for high energy density physics experiments. In association with Greenfield Technology, we developed a specific timing system to synchronize the 176 laser beams on the target with a precision better than 40 ps rms and to trigger and mark plasma diagnostics. The final architecture, settled and used since three years, is based on a master oscillator that sends a clock with serial data through a fiber-optic network, allowing to synchronize more than 500 delay generators spread over the large LMJ facility. The settings of each laser beam and the various experiments require different sampling rates (multi to single shot) and 16 groups for coactivity. Three kinds of delay generators, electrical and optical, are designed for standard precision (<150 ps jitter) and the third is designed for high precision. Each output deliver trigger or fiducial signals with jitter down to 5 ps and peak-to-peak wander less than 10 ps over a week. Test performance of this LMJ timing system is in progress all over the LMJ facility. Besides it will be installed on the petawatt laser (PETAL) this year.
	Slides TUBPR06 [58.283 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2019-TUBPR06
About •	paper received ※ 30 September 2019 paper accepted ※ 10 October 2019 issue date ※ 30 August 2020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Ultra-High Precision Timing System for the CEA-Laser Megajoule

347

S. Hocquet, N. Bazoge, Ph. Hours, D. Monnier-Bourdin
Greenfield Technology, Massy, France
T. Falgon, T. Somerlinck
CEA, LE BARP cedex, France

High power laser such as the Laser MegaJoule (LMJ) or National Ignition Facility (NIF) requires different types of trigger precision to synchronize all the laser beams, plasma diagnostics and generate fiducials. Greenfield Technology, which designs and produces picosecond delay generator and timing system for about 20 years, has been hired by CEA to develop new products to meet the LMJ requirements. About 2000 triggers are about to be set to control and synchronize all of the 176 laser beams on the target with a precision better than 40 ps RMS. Among these triggers, Greenfield Technology’s GFT10¹² is a 4-channels delay generator challenging ultra-high performances: an ultra-low jitter between 2 slaves below 4 ps RMS and a peak-to-peak wander over 1 week lower than 6 ps due to a thermal control of the most sensitive part (the thermal drift is below 1 ps/°C) and specific developments for clock management and restitution. On going investigation should bring the jitter close to 2 ps RMS between 2 slaves.

Poster MOPHA059 [0.488 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2019-MOPHA059

About •

paper received ※ 30 September 2019 paper accepted ※ 09 October 2019 issue date ※ 30 August 2020

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUBPR06

Laser Megajoule Timing System

749

T. Somerlinck, T. Falgon
CEA, LE BARP cedex, France
N. Bazoge, S. Hocquet, D. Monnier-Bourdin
Greenfield Technology, Massy, France

The aim of the Laser Megajoule facility (LMJ) is to deliver more than 1 MJ of laser energy to targets for high energy density physics experiments. In association with Greenfield Technology, we developed a specific timing system to synchronize the 176 laser beams on the target with a precision better than 40 ps rms and to trigger and mark plasma diagnostics. The final architecture, settled and used since three years, is based on a master oscillator that sends a clock with serial data through a fiber-optic network, allowing to synchronize more than 500 delay generators spread over the large LMJ facility. The settings of each laser beam and the various experiments require different sampling rates (multi to single shot) and 16 groups for coactivity. Three kinds of delay generators, electrical and optical, are designed for standard precision (<150 ps jitter) and the third is designed for high precision. Each output deliver trigger or fiducial signals with jitter down to 5 ps and peak-to-peak wander less than 10 ps over a week. Test performance of this LMJ timing system is in progress all over the LMJ facility. Besides it will be installed on the petawatt laser (PETAL) this year.

Slides TUBPR06 [58.283 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2019-TUBPR06

About •

paper received ※ 30 September 2019 paper accepted ※ 10 October 2019 issue date ※ 30 August 2020

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)