ICALEPCS2021 - List of Keywords (laser)

Paper	Title	Other Keywords	Page
MOAL02	Status of the National Ignition Facility (NIF) Integrated Computer Control and Information Systems	controls, target, diagnostics, experiment	9
	M. Fedorov, A.I. Barnes, L. Beaulac, G.K. Brunton, A.D. Casey, J.R. Castro Morales, J. Dixon, C.M. Estes, M.S. Flegel, V.K. Gopalan, S. Heerey, R. Lacuata, V.J. Miller Kamm, M. Paul, B.M. Van Wonterghem, S. Weaver LLNL, Livermore, California, USA
	Funding: This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344 The National Ignition Facility (NIF) is the world’s most energetic laser system used for Inertial Confinement Fusion (ICF) and High Energy Density Physics (HEDP) experimentation. Each laser shot delivers up to 1.9 MJ of ultraviolet light, driving target temperatures to in excess of 180 million K and pressures 100 billion times atmospheric ’ making possible direct study of conditions mimicking interiors of stars and planets, as well as our primary scientific applications: stockpile stewardship and fusion power. NIF control and diagnostic systems allow physicists to precisely manipulate, measure and image this extremely dense and hot matter. A major focus in the past two years has been adding comprehensive new diagnostic instruments to evaluate increasing energy and power of the laser drive. When COVID-19 struck, the controls team leveraged remote access technology to provide efficient operational support without stress of on-site presence. NIF continued to mitigate inevitable technology obsolescence after 20 years since construction. In this talk, we will discuss successes and challenges, including NIF progress towards ignition, achieving record neutron yields in early 2021. LLNL-ABS-821973
	Slides MOAL02 [5.014 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2021-MOAL02
About •	Received ※ 10 October 2021 Accepted ※ 30 November 2021 Issue date ※ 24 February 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPV003	Laser Megajoule Facility Operating Software Overview	software, controls, experiment, network	104
	J-P. Airiau, V. Denis, H. Durandeau, P. Fourtillan, N. Loustalet, P. Torrent CEA, LE BARP cedex, France
	The Laser MegaJoule (LMJ), the French 176-beam laser facility, is located at the CEA CESTA Laboratory near Bordeaux (France). It is designed to deliver about 1.4 MJ of energy on targets, for high energy density physics experiments, including fusion experiments. The first bundle of 8-beams was commissioned in October 2014. By the end of 2021, ten bundles of 8-beams are expected to be fully operational. Operating software tools are used to automate, secure and optimize the operations on the LMJ facility. They contribute to the smooth running of the experiment process (from the setup to the results). They are integrated in the maintenance process (from the supply chain to the asset management). They are linked together in order to exchange data and they interact with the control command system. This talk gives an overview of the existing operating software and the lessons learned. It finally explains the incoming works to automate the lifecycle management of elements included in the final optic assembly (replacement, repair, etc.).
	Poster MOPV003 [0.656 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2021-MOPV003
About •	Received ※ 08 October 2021 Revised ※ 22 October 2021 Accepted ※ 03 November 2021 Issue date ※ 13 February 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPV021	Upgrading the National Ignition Facility’s (NIF) Integrated Computer Control System to Support Optical Thompson Scattering (OTS) Diagnostic	controls, database, operation, alignment	173
	A.I. Barnes, A.A.S. Awwal, L. Beaulac, B. Blackwell, G.K. Brunton, K. Burns, J.R. Castro Morales, M. Fedorov, R. Lacuata, R.R. Leach, D.G. Mathisen, V.J. Miller Kamm, S. Muralidhar, V. Pacheu, Y. Pan, S. Patankar, B.P. Patel, M. Paul, R. Rozenshteyn, R.J. Sanchez, S. Sauter, M. Taranowski, D. Tucker, K.C. Wilhelmsen, B.A. Wilson, H. Zhang LLNL, Livermore, California, USA
	Funding: This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. With the ability to deliver 2.1 MJ of 500 TW ultraviolet laser light to a target, the National Ignition Facility (NIF) is the world’s most energetic laser. This combination of energy and power allows the study of materials under conditions similar to the center of the sun. On fusion ignition experiments, plasma generated in the interior of the target shell can detrimentally impact the implosion symmetry and the resulting energy output. We are in the final stages of commissioning a significant new diagnostic system that will allow us to better understand the plasma conditions and improve our symmetry control techniques. This Optical Thompson Scattering (OTS) system consists of two major components: a probe laser beamline capable of delivering a world first 1 J of energy at 211 nm, and a diagnostic that both reflects the probe laser into the target and collects the scattered photons. Between these two components, the control system enhancements required integration of over 450 components into the existing automation suite. This talk will provide an overview of the system upgrade approach and the tools used to efficiently manage and test changes to both our data and software.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2021-MOPV021
About •	Received ※ 09 October 2021 Accepted ※ 10 February 2022 Issue date ※ 21 February 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPV047	Upgrading Oracle APEX Applications at the National Ignition Facility	optics, database, software, GUI	267
	A. Bhasker, R.D. Clark, R.N. Fallejo LLNL, Livermore, California, USA
	As with all experimental physics facilities, NIF has software applications that must persist on a multi-decade timescale. They must be kept up to date for viability, sustainability and security. We present the steps and challenges involved in a major application upgrade project from Oracle APEX v5 to Oracle APEX v19.2. This upgrade involved jumping over 2 major versions and a total of 5 releases of Oracle APEX. Some applications that depended on now legacy Oracle APEX constructs required redesigning, while others that broke due to custom JavaScript needed to be updated for compatibility. This upgrade project, undertaken by the NIF Shot Data Systems team at LLNL, involved reverse-engineering functional requirements for applications that were then redesigned using the latest APEX out-of-the-box functionality, as well as identifying changes made in the new Oracle APEX built-in ’plumbing’ to update custom-built features for compatibility with the new Oracle APEX version. As NIF enters into its second decade of operations, this upgrade allows these aging applications to function in a more sustainable way, while enhancing user experience with a modernized GUI for Oracle APEX web-pages.
	Poster MOPV047 [1.392 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2021-MOPV047
About •	Received ※ 08 October 2021 Accepted ※ 10 February 2022 Issue date ※ 17 March 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPV032	Challenges of Automating the Photocathode Fabrication Process at CERN	controls, cathode, power-supply, electron	464
	C. Charrondière, E. Chevallay, T. Zilliox CERN, Geneva, Switzerland
	The CERN Photoemission Laboratory was founded in 1989 with the goal of studying laser-driven electron sources, for producing high-brightness electron beams within the framework of the Compact Linear Collider (CLIC) study. To produce these photocathodes, two processes run in parallel. The first process, which is slow and asynchronous, controls and monitors the evaporation of photoemissive material. For this first step several power supplies are controlled to evaporate different metals through the Joule effect, with the power maintained constant in time and the thickness deposited monitored. The second process is synchronized with a laser trigger ranging from 0.1 to 50Hz, where the photocurrent and laser energy are measured to calculate the Quantum Efficiency. The control system for these processes has recently been renovated to benefit from the modularity of a PXI-based real-time environment using the standard CERN MiddleWare communication layer (CMW). This paper describes the challenges of the fabrication process as well as the flexibility introduced by using a PXI system.
	Poster TUPV032 [0.958 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2021-TUPV032
About •	Received ※ 08 October 2021 Revised ※ 18 October 2021 Accepted ※ 20 November 2021 Issue date ※ 01 December 2021
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPV039	A Reliable Monitoring and Control System for Vacuum Surface Treatments	controls, software, hardware, electron	492
	J. Tagg, E. Bez, M. Himmerlich, A.K. Reascos Portilla CERN, Meyrin, Switzerland
	Secondary electron yield (SEY) of beam-screens in the LHC puts limits on the performance of the accelerator. To ramp up the luminosity for the HiLumi LHC project, the vacuum surface coatings team are coming up with ways to treat the surfaces to control the electron cloud and bring the SEY down to acceptable levels. These treatments can take days to weeks and need to work reliably to be sure the surfaces are not damaged. An embedded control and monitoring system based on a CompactRIO is being developed to run these processes in a reliable way. This paper describes the techniques used to create a LabVIEW-based real-time embedded system that is reliable as well as easy to read and modify. We will show how simpler approaches can in some situations yield better solutions.
	Poster TUPV039 [0.504 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2021-TUPV039
About •	Received ※ 08 October 2021 Revised ※ 18 October 2021 Accepted ※ 20 November 2021 Issue date ※ 11 March 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEAL01	Image Processing Alignment Algorithms for the Optical Thomson Scattering Laser at the National Ignition Facility	alignment, target, optics, plasma	528
	A.A.S. Awwal, T.S. Budge, R.R. Leach, R.R. Lowe-Webb, V.J. Miller Kamm, S. Patankar, B.P. Patel, K.C. Wilhelmsen LLNL, Livermore, California, USA
	Funding: This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. Understanding plasma performance in the world’s largest and most energetic laser facility, the National Ignition Facility (NIF), is an important step to achieving the goal of inertial confinement fusion in a laboratory setting. The optical Thompson scattering (OTS) laser has been developed to understand the target implosion physics, especially for under-dense plasma conditions. A 5w probe beams can be set up for diagnosing various plasma densities. Just as the NIF laser with 192 laser beams are precisely aligned, the OTS system also requires precision alignment using a series of automated closed loop control steps. CCD images from the OTS laser (OTSL) beams are analyzed using a suite of image processing algorithm. The algorithms provide beam position measurements that are used to control motorized mirrors that steer beams to their defined desired location. In this paper, several alignment algorithms will be discussed with details on how they take advantage of various types of fiducials such as diffraction rings, contrasting squares and circles, octagons and very faint 5w laser beams. This is released as LLNL-ABS-821809
	Slides WEAL01 [1.303 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2021-WEAL01
About •	Received ※ 08 October 2021 Revised ※ 18 October 2021 Accepted ※ 21 November 2021 Issue date ※ 14 March 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEBL02	Prototype of Image Acquisition and Storage System for SHINE	interface, network, FEL, database	564
	H.H. Lv, D.P. Bai, X.M. Liu, H. Zhao SSRF, Shanghai, People’s Republic of China
	Shanghai HIgh repetition rate XFEL aNd Extreme light facility (SHINE) is a quasi-continuous wave hard X-ray free electron laser facility, which is currently under construction. The image acquisition and storage system has been designed to handle a large quantity of image data generated by the beam and X-ray diagnostics system, the laser system, etc. A prototype system with Camera Link cameras has been developed to acquire and to reliably transport data at a throughput of 1000MB/sec. The image data are transferred through ZeroMQ protocol to the storage where the image data and the relevant metadata are archived and made available for user analysis. For high-speed frames of image data storage, optimized schema is identified by comparing and testing four schemas. The image data are written to HDF5 files and the metadata pertaining to the image are stored in NoSQL database. It could deliver up to 1.2GB/sec storage speed. The performances are also contrasted between a stand-alone server and the Lustre file system. And the Lustre could provide a better performance. Details of the image acquisition, transfer, and storage schemas will be described in the paper.
	Slides WEBL02 [3.703 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2021-WEBL02
About •	Received ※ 10 October 2021 Accepted ※ 21 November 2021 Issue date ※ 12 February 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPV036	The LMJ Target Chamber Diagnostic Module	vacuum, target, experiment, Windows	734
	R. Clot CEA, LE BARP cedex, France
	The Laser MegaJoule (LMJ), the French 176-beam laser facility, is located at the CEA CESTA Laboratory near Bordeaux (France). It is designed to deliver about 1.4 MJ of energy on targets, for high energy density physics experiments, including fusion experiments. The first bundle of 8-beams was commissioned in October 2014. By the end of 2021, ten bundles of 8-beams are expected to be fully operational. Due to energy levels achieved, optical components located at the end of the bundles are highly subject to damage stresses. This is particularly the case with vacuum windows whose integrity is critical. To measure these damages, identify the growth laws, and prevent their degradation (through blockers), the Target Chamber Diagnostic Module (TCDM) was integrated into the LMJ installation in 2019. This diagnostic, which also measures the windows transmission rate, as well as the spatial energy distribution at the end of the bundles, has been designed to operate automatically at night, between two experiments. This presentation describes this 2 years feedback of TCDM and presents the areas for improvement which have been identified to optimize its efficiency and reduce its timeline.
	Slides WEPV036 [2.047 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2021-WEPV036
About •	Received ※ 08 October 2021 Accepted ※ 05 January 2022 Issue date ※ 25 January 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPV036	Laser Driver State Estimation Oriented Data Governance	experiment, database, data-analysis, data-management	942
	J. Luo, L. Li, Z. Ni, X. Zhou CAEP, Sichuan, People’s Republic of China
	Laser driver state estimation is an important task dur-ing the operation process for the high-power laser facility, by utilizing measured data to analyze experiment results and laser driver performances. It involves complicated data processing jobs, including data extraction, data cleaning, data fusion, data visualization and so on. Data governance aims to improve the efficiency and quality of data analysis for laser driver state estimation, which fo-cuses on 4 aspects ’ data specification, data cleaning, data exchange, and data integration. The achievements of data governance contribute to not only laser driver state estimation, but also other experimental data analy-sis applications.
	Poster THPV036 [0.477 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2021-THPV036
About •	Received ※ 10 October 2021 Revised ※ 24 October 2021 Accepted ※ 21 November 2021 Issue date ※ 22 February 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRAL01	The Laser MegaJoule Facility Status Report	target, experiment, diagnostics, operation	989
	H. Cortey CEA, LE BARP cedex, France
	The Laser MegaJoule (LMJ), the French 176-beam laser facility, is located at the CEA CESTA Laboratory near Bordeaux (France). It is designed to deliver about 1.4 MJ of energy on targets, for high energy density physics experiments, including fusion experiments. The first bundle of 8-beams was commissioned in October 2014. By the end of 2021, ten bundles of 8-beams are expected to be fully operational. In this paper, we will present: - The LMJ Bundles Status report - The main evolutions of the LMJ facility since ICALEPS 2019: the new target diagnostics commissioned and a new functionality to manage final optic damage with the implementation of blockers in the beam. - the result of a major milestone for the project : ‘Fusion Milestone’
	Slides FRAL01 [7.812 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2021-FRAL01
About •	Received ※ 09 October 2021 Revised ※ 01 February 2022 Accepted ※ 22 February 2022 Issue date ※ 01 March 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOAL02

Status of the National Ignition Facility (NIF) Integrated Computer Control and Information Systems

controls, target, diagnostics, experiment

9

M. Fedorov, A.I. Barnes, L. Beaulac, G.K. Brunton, A.D. Casey, J.R. Castro Morales, J. Dixon, C.M. Estes, M.S. Flegel, V.K. Gopalan, S. Heerey, R. Lacuata, V.J. Miller Kamm, M. Paul, B.M. Van Wonterghem, S. Weaver
LLNL, Livermore, California, USA

Funding: This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344
The National Ignition Facility (NIF) is the world’s most energetic laser system used for Inertial Confinement Fusion (ICF) and High Energy Density Physics (HEDP) experimentation. Each laser shot delivers up to 1.9 MJ of ultraviolet light, driving target temperatures to in excess of 180 million K and pressures 100 billion times atmospheric ’ making possible direct study of conditions mimicking interiors of stars and planets, as well as our primary scientific applications: stockpile stewardship and fusion power. NIF control and diagnostic systems allow physicists to precisely manipulate, measure and image this extremely dense and hot matter. A major focus in the past two years has been adding comprehensive new diagnostic instruments to evaluate increasing energy and power of the laser drive. When COVID-19 struck, the controls team leveraged remote access technology to provide efficient operational support without stress of on-site presence. NIF continued to mitigate inevitable technology obsolescence after 20 years since construction. In this talk, we will discuss successes and challenges, including NIF progress towards ignition, achieving record neutron yields in early 2021.
LLNL-ABS-821973

Slides MOAL02 [5.014 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2021-MOAL02

About •

Received ※ 10 October 2021 Accepted ※ 30 November 2021 Issue date ※ 24 February 2022

Cite •

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

MOPV003

Laser Megajoule Facility Operating Software Overview

software, controls, experiment, network

104

J-P. Airiau, V. Denis, H. Durandeau, P. Fourtillan, N. Loustalet, P. Torrent
CEA, LE BARP cedex, France

The Laser MegaJoule (LMJ), the French 176-beam laser facility, is located at the CEA CESTA Laboratory near Bordeaux (France). It is designed to deliver about 1.4 MJ of energy on targets, for high energy density physics experiments, including fusion experiments. The first bundle of 8-beams was commissioned in October 2014. By the end of 2021, ten bundles of 8-beams are expected to be fully operational. Operating software tools are used to automate, secure and optimize the operations on the LMJ facility. They contribute to the smooth running of the experiment process (from the setup to the results). They are integrated in the maintenance process (from the supply chain to the asset management). They are linked together in order to exchange data and they interact with the control command system. This talk gives an overview of the existing operating software and the lessons learned. It finally explains the incoming works to automate the lifecycle management of elements included in the final optic assembly (replacement, repair, etc.).

Poster MOPV003 [0.656 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2021-MOPV003

About •

Received ※ 08 October 2021 Revised ※ 22 October 2021 Accepted ※ 03 November 2021 Issue date ※ 13 February 2022

Cite •

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

MOPV021

Upgrading the National Ignition Facility’s (NIF) Integrated Computer Control System to Support Optical Thompson Scattering (OTS) Diagnostic

controls, database, operation, alignment

173

A.I. Barnes, A.A.S. Awwal, L. Beaulac, B. Blackwell, G.K. Brunton, K. Burns, J.R. Castro Morales, M. Fedorov, R. Lacuata, R.R. Leach, D.G. Mathisen, V.J. Miller Kamm, S. Muralidhar, V. Pacheu, Y. Pan, S. Patankar, B.P. Patel, M. Paul, R. Rozenshteyn, R.J. Sanchez, S. Sauter, M. Taranowski, D. Tucker, K.C. Wilhelmsen, B.A. Wilson, H. Zhang
LLNL, Livermore, California, USA

Funding: This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
With the ability to deliver 2.1 MJ of 500 TW ultraviolet laser light to a target, the National Ignition Facility (NIF) is the world’s most energetic laser. This combination of energy and power allows the study of materials under conditions similar to the center of the sun. On fusion ignition experiments, plasma generated in the interior of the target shell can detrimentally impact the implosion symmetry and the resulting energy output. We are in the final stages of commissioning a significant new diagnostic system that will allow us to better understand the plasma conditions and improve our symmetry control techniques. This Optical Thompson Scattering (OTS) system consists of two major components: a probe laser beamline capable of delivering a world first 1 J of energy at 211 nm, and a diagnostic that both reflects the probe laser into the target and collects the scattered photons. Between these two components, the control system enhancements required integration of over 450 components into the existing automation suite. This talk will provide an overview of the system upgrade approach and the tools used to efficiently manage and test changes to both our data and software.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2021-MOPV021

About •

Received ※ 09 October 2021 Accepted ※ 10 February 2022 Issue date ※ 21 February 2022

Cite •

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

MOPV047

Upgrading Oracle APEX Applications at the National Ignition Facility

optics, database, software, GUI

267

A. Bhasker, R.D. Clark, R.N. Fallejo
LLNL, Livermore, California, USA

As with all experimental physics facilities, NIF has software applications that must persist on a multi-decade timescale. They must be kept up to date for viability, sustainability and security. We present the steps and challenges involved in a major application upgrade project from Oracle APEX v5 to Oracle APEX v19.2. This upgrade involved jumping over 2 major versions and a total of 5 releases of Oracle APEX. Some applications that depended on now legacy Oracle APEX constructs required redesigning, while others that broke due to custom JavaScript needed to be updated for compatibility. This upgrade project, undertaken by the NIF Shot Data Systems team at LLNL, involved reverse-engineering functional requirements for applications that were then redesigned using the latest APEX out-of-the-box functionality, as well as identifying changes made in the new Oracle APEX built-in ’plumbing’ to update custom-built features for compatibility with the new Oracle APEX version. As NIF enters into its second decade of operations, this upgrade allows these aging applications to function in a more sustainable way, while enhancing user experience with a modernized GUI for Oracle APEX web-pages.

Poster MOPV047 [1.392 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2021-MOPV047

About •

Received ※ 08 October 2021 Accepted ※ 10 February 2022 Issue date ※ 17 March 2022

Cite •

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

TUPV032

Challenges of Automating the Photocathode Fabrication Process at CERN

controls, cathode, power-supply, electron

464

C. Charrondière, E. Chevallay, T. Zilliox
CERN, Geneva, Switzerland

The CERN Photoemission Laboratory was founded in 1989 with the goal of studying laser-driven electron sources, for producing high-brightness electron beams within the framework of the Compact Linear Collider (CLIC) study. To produce these photocathodes, two processes run in parallel. The first process, which is slow and asynchronous, controls and monitors the evaporation of photoemissive material. For this first step several power supplies are controlled to evaporate different metals through the Joule effect, with the power maintained constant in time and the thickness deposited monitored. The second process is synchronized with a laser trigger ranging from 0.1 to 50Hz, where the photocurrent and laser energy are measured to calculate the Quantum Efficiency. The control system for these processes has recently been renovated to benefit from the modularity of a PXI-based real-time environment using the standard CERN MiddleWare communication layer (CMW). This paper describes the challenges of the fabrication process as well as the flexibility introduced by using a PXI system.

Poster TUPV032 [0.958 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2021-TUPV032

About •

Received ※ 08 October 2021 Revised ※ 18 October 2021 Accepted ※ 20 November 2021 Issue date ※ 01 December 2021

Cite •

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

TUPV039

A Reliable Monitoring and Control System for Vacuum Surface Treatments

controls, software, hardware, electron

492

J. Tagg, E. Bez, M. Himmerlich, A.K. Reascos Portilla
CERN, Meyrin, Switzerland

Secondary electron yield (SEY) of beam-screens in the LHC puts limits on the performance of the accelerator. To ramp up the luminosity for the HiLumi LHC project, the vacuum surface coatings team are coming up with ways to treat the surfaces to control the electron cloud and bring the SEY down to acceptable levels. These treatments can take days to weeks and need to work reliably to be sure the surfaces are not damaged. An embedded control and monitoring system based on a CompactRIO is being developed to run these processes in a reliable way. This paper describes the techniques used to create a LabVIEW-based real-time embedded system that is reliable as well as easy to read and modify. We will show how simpler approaches can in some situations yield better solutions.

Poster TUPV039 [0.504 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2021-TUPV039

About •

Received ※ 08 October 2021 Revised ※ 18 October 2021 Accepted ※ 20 November 2021 Issue date ※ 11 March 2022

Cite •

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

WEAL01

Image Processing Alignment Algorithms for the Optical Thomson Scattering Laser at the National Ignition Facility

alignment, target, optics, plasma

528

A.A.S. Awwal, T.S. Budge, R.R. Leach, R.R. Lowe-Webb, V.J. Miller Kamm, S. Patankar, B.P. Patel, K.C. Wilhelmsen
LLNL, Livermore, California, USA

Funding: *This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
Understanding plasma performance in the world’s largest and most energetic laser facility, the National Ignition Facility (NIF), is an important step to achieving the goal of inertial confinement fusion in a laboratory setting. The optical Thompson scattering (OTS) laser has been developed to understand the target implosion physics, especially for under-dense plasma conditions. A 5w probe beams can be set up for diagnosing various plasma densities. Just as the NIF laser with 192 laser beams are precisely aligned, the OTS system also requires precision alignment using a series of automated closed loop control steps. CCD images from the OTS laser (OTSL) beams are analyzed using a suite of image processing algorithm. The algorithms provide beam position measurements that are used to control motorized mirrors that steer beams to their defined desired location. In this paper, several alignment algorithms will be discussed with details on how they take advantage of various types of fiducials such as diffraction rings, contrasting squares and circles, octagons and very faint 5w laser beams.
*This is released as LLNL-ABS-821809

Slides WEAL01 [1.303 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2021-WEAL01

About •

Received ※ 08 October 2021 Revised ※ 18 October 2021 Accepted ※ 21 November 2021 Issue date ※ 14 March 2022

Cite •

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

WEBL02

Prototype of Image Acquisition and Storage System for SHINE

interface, network, FEL, database

564

H.H. Lv, D.P. Bai, X.M. Liu, H. Zhao
SSRF, Shanghai, People’s Republic of China

Shanghai HIgh repetition rate XFEL aNd Extreme light facility (SHINE) is a quasi-continuous wave hard X-ray free electron laser facility, which is currently under construction. The image acquisition and storage system has been designed to handle a large quantity of image data generated by the beam and X-ray diagnostics system, the laser system, etc. A prototype system with Camera Link cameras has been developed to acquire and to reliably transport data at a throughput of 1000MB/sec. The image data are transferred through ZeroMQ protocol to the storage where the image data and the relevant metadata are archived and made available for user analysis. For high-speed frames of image data storage, optimized schema is identified by comparing and testing four schemas. The image data are written to HDF5 files and the metadata pertaining to the image are stored in NoSQL database. It could deliver up to 1.2GB/sec storage speed. The performances are also contrasted between a stand-alone server and the Lustre file system. And the Lustre could provide a better performance. Details of the image acquisition, transfer, and storage schemas will be described in the paper.

Slides WEBL02 [3.703 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2021-WEBL02

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Received ※ 10 October 2021 Accepted ※ 21 November 2021 Issue date ※ 12 February 2022

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WEPV036

The LMJ Target Chamber Diagnostic Module

vacuum, target, experiment, Windows

734

R. Clot
CEA, LE BARP cedex, France

The Laser MegaJoule (LMJ), the French 176-beam laser facility, is located at the CEA CESTA Laboratory near Bordeaux (France). It is designed to deliver about 1.4 MJ of energy on targets, for high energy density physics experiments, including fusion experiments. The first bundle of 8-beams was commissioned in October 2014. By the end of 2021, ten bundles of 8-beams are expected to be fully operational. Due to energy levels achieved, optical components located at the end of the bundles are highly subject to damage stresses. This is particularly the case with vacuum windows whose integrity is critical. To measure these damages, identify the growth laws, and prevent their degradation (through blockers), the Target Chamber Diagnostic Module (TCDM) was integrated into the LMJ installation in 2019. This diagnostic, which also measures the windows transmission rate, as well as the spatial energy distribution at the end of the bundles, has been designed to operate automatically at night, between two experiments. This presentation describes this 2 years feedback of TCDM and presents the areas for improvement which have been identified to optimize its efficiency and reduce its timeline.

Slides WEPV036 [2.047 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2021-WEPV036

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Received ※ 08 October 2021 Accepted ※ 05 January 2022 Issue date ※ 25 January 2022

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THPV036

Laser Driver State Estimation Oriented Data Governance

experiment, database, data-analysis, data-management

942

J. Luo, L. Li, Z. Ni, X. Zhou
CAEP, Sichuan, People’s Republic of China

Laser driver state estimation is an important task dur-ing the operation process for the high-power laser facility, by utilizing measured data to analyze experiment results and laser driver performances. It involves complicated data processing jobs, including data extraction, data cleaning, data fusion, data visualization and so on. Data governance aims to improve the efficiency and quality of data analysis for laser driver state estimation, which fo-cuses on 4 aspects ’ data specification, data cleaning, data exchange, and data integration. The achievements of data governance contribute to not only laser driver state estimation, but also other experimental data analy-sis applications.

Poster THPV036 [0.477 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2021-THPV036

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Received ※ 10 October 2021 Revised ※ 24 October 2021 Accepted ※ 21 November 2021 Issue date ※ 22 February 2022

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FRAL01

The Laser MegaJoule Facility Status Report

target, experiment, diagnostics, operation

989

H. Cortey
CEA, LE BARP cedex, France

The Laser MegaJoule (LMJ), the French 176-beam laser facility, is located at the CEA CESTA Laboratory near Bordeaux (France). It is designed to deliver about 1.4 MJ of energy on targets, for high energy density physics experiments, including fusion experiments. The first bundle of 8-beams was commissioned in October 2014. By the end of 2021, ten bundles of 8-beams are expected to be fully operational. In this paper, we will present: - The LMJ Bundles Status report - The main evolutions of the LMJ facility since ICALEPS 2019: the new target diagnostics commissioned and a new functionality to manage final optic damage with the implementation of blockers in the beam. - the result of a major milestone for the project : ‘Fusion Milestone’

Slides FRAL01 [7.812 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2021-FRAL01

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Received ※ 09 October 2021 Revised ※ 01 February 2022 Accepted ※ 22 February 2022 Issue date ※ 01 March 2022

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