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Femtosecond fiber timing distribution system for the linac coherent light source

Femtosecond fiber timing distribution system for the linac c...

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35th International Free-Electron Laser conference, FEL 2013

作者： Li, Heng Chen, Li-Jin Cheng, Haynes Pak Hay May, Justin E. Smith, Steve Muehlig, Kerstin Uttamadoss, Akshaya Frisch, Josef C. Fry, Alan R. Kärtner, Franz X. Bucksbaum, Philip H. Stanford PULSE Institute Stanford University Stanford CA United States Department of Physics Stanford University Stanford CA United States Department of Applied Physics Stanford University Stanford CA United States SLAC National Accelerator Laboratory Menlo Park CA United States Idesta Quantum Electronics LLC Newton NJ United States Department of Electrical Engineering Princeton University Princeton NJ United States Department of Electrical Engineering and Computer Science Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA United States Center for Free-Electron Laser Science DESY University of Hamburg Hamburg Germany

ISBN: (纸本)9783954501267

We present the design and progress of a femtosecond fiber timing distribution system for the Linac Coherent Light Source (LCLS) [1-3] at SLAC to enable the machine diagnostic at the 10 fs level. the LCLS at the SLAC is the world's first hard x-ray free-electron laser (XFEL) with unprecedented peak brightness and pulse duration [1-3]. the time-resolved optical/x-ray pumpprobe experiments at this facility open the era of exploring the ultrafast dynamics of atoms, molecules, proteins, and condensed matter [4-6]. However, the temporal resolution of current experiments is limited by the timing jitter between the optical and x-ray pulses [7, 8]. Recently, sub-25 fs root mean squared (rms) jitter is achieved from an x-ray/optical cross-correlator at the LCLS [9], and external seeding is expected to reduce the intrinsic timing jitter [10, 11], which would enable full synchronization of the optical and x-ray pulses with sub- 10 fs precision. For such a technique, tight synchronization between seed and pump lasers needs to be implemented [12-16]. Preliminary test results of the major components for a 4 link system will be presented. currently, the system is geared towards diagnostics to study the various sources of jitter at the LCLS. Copyright © 2013 CC-BY-3.0 and by the respective authors.

关键词： Free electron lasers

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Experimental study of power-limiting factors of 1.1 μm range edge-emitting lasers based on InGaAs/GaAs quantum well-dot nanostructures 6

Experimental study of power-limiting factors of 1.1 μm rang...

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6th International School and conference on Optoelectronics, Photonics, engineering and Nanostructures, SPbOPEN 2019

作者： Serin, A.A. Payusov, A.S. Kornyshov, G.O. Shernyakov, Yu.M. Mintairov, S.A. Kalyuzhnyy, N.A. Kulagina, M.M. Zhukov, A.E. Gordeev, N.Yu. Maximov, M.V. Ioffe Institute 26 Polytechnicheskaya St Petersburg194021 Russia St. Petersburg Academic University 8/3 Khlopina St Petersburg194021 Russia

We present a study of high-power characteristics of edge-emitting lasers based on quantum well-dots (QWD) in a pulsed regime. QWD-based lasers with 2 and 5 active layers emitting at ∼1.1 μm provided maximal optical power of 39 W limited by the pulse current source available. We have investigated the lasing spectra and shown that under the injection current above 20 kA/cm2 the active region overheats approximately by 0.5°C per 1 kA/cm2 during 100 ns current pulse. the active region overheating correlates well with the reducing of the differential efficiency of our devices. We believe that maximal pulse optical power of the QWD-based lasers is limited mainly by our laser wafer design rather than by the QWD active media properties. © Published under licence by IOP Publishing Ltd.

关键词： Semiconductor quantum wells

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Integrated green-grey-blue system: a bibliometric analysis-based review 5

Integrated green-grey-blue system: a bibliometric analysis-b...

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5th International conference on Green Energy, Environment, and Sustainable Development, GEESD 2024

作者： Jia, Ruilan Fu, Chun Gan, Yuqun School of Infrastructure Engineering Nanchang University Jiangxi Nanchang330038 China Design and Research Institute of Nanchang University Jiangxi Nanchang330038 China School of Public Policy and Management Nanchang University Jiangxi Nanchang330038 China Key Laboratory of Poyang Lake Environment and Resource Utilization Ministry of Education Nanchang University Jiangxi Nanchang330038 China School of Civil Engineering and Architecture East China Jiaotong University Jiangxi Nanchang330100 China

ISBN: (纸本)9781510683006

the Integrated Green-Grey-Blue System (IGGBS) represents an advanced strategy for sustainable stormwater management, critically enhancing water resource efficiency and urban resilience. this study utilizes the Web of Science Core Database, R language’s Bibliometrix tool, and CiteSpace software to comprehensively review the research developments in IGGBS. the objective is to integrate international experiences and address current challenges and future directions. the findings indicate: (1) International research on IGGBS has shown consistent growth, with notable increases in China from 2020 to 2023, underscoring its significance in the development of sponge cities;(2) the majority of the studies are published in Q1 category journals of the Journal Citation Reports, predominantly authored by scholars from developed nations such as the USA, UK, and Germany, with fewer contributions from Chinese researchers;(3) IGGBS research is intricately linked with ecosystem services, climate change, urbanization, and resilience theory, trending towards more precise indicators and diverse objectives. Furthermore, the study highlights a gap between theoretical research and practical implementation, pointing to a lack of comprehensive exploration of coupling relationships and future uncertainties. It suggests the necessity to enhance evaluation systems, and foster interdisciplinary collaboration and public engagement, closely aligned with policy, to facilitate the broader adoption and management of IGGBS. © 2024 SPIE.

关键词： Climate change

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Window-based energy-aware model for real-time detection and reporting of progressive development of cardiac atrial fibrillation in wearable computing

Window-based energy-aware model for real-time detection and ...

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International Symposium on High Capacity optical Networks and Enabling Technologies, HONET

作者： Redjem Bouhenguel Imad Mahgoub Mohammad Ilyas Department o/Computer Electrical Engineering & Computer Science Florida Atlantic University Boca Raton FL USA

current portable healthcare monitoring systems are small, battery-operated electrocardiograph devices that are used to record the heart's rhythm and activity. However they are not energy-aware and fall short on delivering real-time early detection and reporting of progressive development of cardiac atrial fibrillation (A-Fib). Previous work by the same authors proposes adopting an incidence-based energy-aware model that incorporates a real-time detection algorithm for the onset of A-Fib using an A-Fib incidence rate in a wearable computing device during a 24 hour period. the results of the adopted incidence-based energy-aware model show an improvement of 38.2% when compared to the energy consumed by current telemetry energy model. this paper extends the previous design to the paroxysmal phase of A-Fib within a personalized A-Fib prevalence window lasting up to 7 days in order to monitor and detect the progressive development of A-Fib in wearable computing devices. the results from the new window-based energy-aware model show that the proposed energy model may potentially consume 89.7% less energy than the telemetry energy model. the design shows promising results in further meeting the energy needs for real-time detection and reporting of progressive development of cardiac A-Fib in wearable computing devices.

关键词： Monitoring Image edge detection Rhythm Biomedical monitoring Fires Wireless sensor networks GSM

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A DEVELOPMENT OF WIDE DYNAMIC-RANGE HALO MONITOR FOR 8 GeV PROTON BEAMS AT FNAL 13

A DEVELOPMENT OF WIDE DYNAMIC-RANGE HALO MONITOR FOR 8 GeV P...

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13th International Beam Instrumentation conference, IBIC 2024

作者： Hashimoto, Y. Omori, C. Sato, Y. Toyama, T. Mitsuhasi, T. Tejima, M. Sasaki, T. Uota, M. Ainsworth, R. Sakai, H. KEK/J-PARC Japan FNAL United States Kanto Information Service Co. Ltd. Japan

ISBN: (纸本)9783954502493

the FNAL accelerator complex has been upgrading in increasing beam intensity and beam quality. A new beam halo diagnostic device is required in the beam transport line between booster and Recycler. For this purpose, it was decided to introduce the wide dynamic range monitor technique that was developed in 2012 and has been in operation at the J-PARC beam transport line. the device is a two-dimensional beam profile monitor, and it has a dynamic range of approximately six digits of magnitude by using of optical Transition Radiation and fluorescence screens. Eliminating harmful beam halos is the most important technique for high-intensity proton accelerators. therefore, beam halo diagnosis is indispensable and becomes more and more important. New FNAL device has been manufactured in a collaboration be-tween J-PARC and FNAL as a part of U.S.-Japan Science and Technology Cooperation Program in High Energy Physics. the equipment will be manufactured at J-PARC and will be shipped to FNAL in 2025. We designed the device to satisfy FNAL specifications: the beam energy, intensity, and size. currently, most of the equipment is under construction. the large-aperture optical system has been completed and its optical characteristics are being evaluated at J-PARC. We have been also investigating measurement methods corresponding to FNAL bunch trains. this paper reports on the current status of these developments. © 2024 International Beam Instrumentation conference. All Rights Reserved.

关键词： Fluorescent screens

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Feasibility study for BNCT of skin melanoma with an accelerator-based neutron source

Feasibility study for BNCT of skin melanoma with an accelera...

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5th International conference on Applications of Nuclear Techniques - Neutrons in Research and Industry

作者： Agosteo, S Colautti, P Corrado, MG dErrico, F Monti, S Silari, M Tinti, R Tornielli, G Departimento di Ingegneria Nucleare Politecnico di Milano via Ponzio 34/3 Milano I-20133 Italy INFN Laboratori Nazionali di Legnaro via Romea 4 Legnaro Padova I-35020 Italy Università degli Studi di Milano Dipartimento di Fisica via Celoria 16 Milano I-20133 Italy Dipartimento di Costruzioni Meccaniche e Nucleari Università di Pisa via Diotisalvi 2 Pisa I-56126 Italy ENEA-ERG-FISS-FIRE via Martiri di Monte Sole 4 Bologna I-40129 Italy Consiglio Nazionale delle Ricerche ITBA via Ampère 56 Milano I-20131 Italy CERN Geneve 23 1211 Switzerland Dipartimento di Fisica Università di Padova via Marzolo 8 Padova I-35131 Italy

ISBN: (纸本)0819422630

the feasibility of an accelerator-driven thermal neutron source for Boron Neutron Capture therapy (BNCT) of skin melanoma is discussed, based on the design of an analogous source for BNCT of the explanted liver. Monte Carlo simulations were performed by introducing some variations in the moderator geometry of that source. Neutrons are generated by 7 MeV deuterons impinging on a thick beryllium target. the neutron moderator consists of a nuclear graphite structure containing a heavy water tank in turn enclosing the beryllium target. the moderator materials were chosen in order to minimize the production of prompt gamma rays. the requested neutron fluence (10(13) cm(-2)) can be achieved in three hours with a deuteron current in the range of 3-8 mA.

关键词： Moderators

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developments in Strategic Materials and Computational design V 1

引用

丛书名： Ceramic engineering and Science Proceedings

2015年

作者： Kriven Waltraud M. Zhu Dongming Moon Kyoung Il Hwang Taejin Wang Jingyang Lewinsohn Charles A. Zhou Yanchun Gyekenyesi Andrew L. Halbig Michael

ISBN: (数字)9781119040316

ISBN: (纸本)9781119040286

this issue contains 31 papers from the American Ceramic Society’s 38th International conference on Advanced Ceramics and Composites, held in Daytona Beach, Florida, January 26-31, 2014. this issue includes papers presented in the following Symposia and Focused Sessions: Symposium 2 – Advanced Ceramic Coatings for Structural, Environmental, and Functional Applications; Symposium 10 – Virtual Materials (Computational) design and Ceramic Genome; Symposium 11 – Advanced Materials and Innovative Processing Ideas for the Industrial Root Technology; Symposium 12 – Materials for Extreme Environments: Ultrahigh Temperature Ceramics and Nanolaminated Ternary Carbides and Nitrides; Focused Session 1 - Geopolymers and Chemically Bonded Ceramics; Focused Session 2 – Advanced Ceramic Materials and Processing for Photonics and Energy; Focused Session 3 – Rare Earth Oxides for Energy, optical and Biomedical Applications, Focused Session 4 – Ion-Transport Membranes; 3rd Global Pacific Rim engineering Ceramics Summit; and the 3rd Annual Global Young Investigator Forum

关键词： nabh ceramics schomborg introduction composites geopolymers ix geopolymer lars situ carbothermal reduction kiesel powder carbonnano nitridation bagci cengieffect kriven ratio solutions geomaterial

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Raytheon FED technology update

Raytheon FED technology update

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4th conference on Cockpit Displays - Flat Panel Displays for Defense Applications

作者： Palevsky, A Visinski, JR Raytheon Co. (United States)

ISBN: (纸本)0819424722

the field emission display (FED) delivers all the advantages of the cathode ray tube (CRT) without the disadvantages. the FED presents the viewer with an unrestricted viewing angle, full-motion video bandwidth, wide operating (-54°C to +95°C) and storage (-62°C to +115°C) temperatures, and "instant on" anywhere in the operating temperature range. the FED does not have the CRT disadvantages of center to edge spot size variations, astigmatism, geometrical position errors, linear distortion, and misconvergence. Additional FED advantages include shallow package depth, fewer process steps than AMLCD, potential lower cost than AMLCD, 1000 times less peak anode current per pixel (FED turns on one row at a time) and inherent shock and vibration resistance provided by low mass internal elements. (See Figure 1 - Field Emission Display is a Flat CRT) Raytheon CRT products are currently installed in high performance military and commercial systems. these platforms include fixed wing aircraft: F-14, F-15, F-16, F/A-18, S-3A, B-1B, JAS-39, Tornado, EF-1 1 1 and B-52; rotary wing vehicles as Apache AH-64D and EH-1O1; shipboard applications SPA-25G and CCS-MKII Los Angeles class submarine fire control system; world-wide air traffic control programs as Canadian RAMP, OIDT, and in some of the other nineteen countries installing Raytheon air traffic control products. FED high power screen efficiency in a monochrome display can exceed 25 lumens per watt and 1 5 lumens per watt in full color applications. Average power dissipation is determined by the higher duty cycle of video content. the 8KV anode of the Raytheon FED yields the highest brightness of any flat panel display at 300 IL to 400 fL after 10% contrast filtering in a 10,000 fc ambient environment. "Instant on" full brightness is achieved within five seconds within the -54°C to +95°C operating range without heaters, ITO layers, anti-freeze or preheating or pre-cooling. the FED full viewing angle of 1600 x 1600 is usable in por

关键词： Plasma display panels Field emission displays CRTs Video Computer aided design Glasses optical fabrication equipment Manufacturing Flat panel displays optical filters

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Growth and fabrication of GaAs-based InAs/AlSb resonant tunneling diode 19

Growth and fabrication of GaAs-based InAs/AlSb resonant tunn...

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19th National conference on Laser Technology and Optoelectronics

作者： Pang, Qiuyao Wu, Donghai Xu, Jianxing Su, Xiangbin Xu, Yingqiang Wang, Guowei Ni, Haiqiao Niu, Zhichuan Key Laboratory of Optoelectronic Materials and Devices Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China College of Electronic Information and Communication Engineering University of Chinese Academy of Sciences Beijing100049 China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Beijing100049 China Microsystem and Terahertz Research Center China Academy of Engineering Physics Sichuan Chengdu610200 China

ISBN: (纸本)9781510683228

With optimized buffer design, we demonstrate a new InAs/AlSb resonant tunneling diode (RTD) on lattice-unmatched semi-insulating (SI) GaAs (100) substrates aiming for terahertz oscillators. To obtain high crystal quality and smooth surface, 5 periods InGaAs/GaAs (2 ML/2 ML) superlattices (SLs) buffer layer was used as dislocation filters (DFs). X-ray diffraction (XRD) measurement showed the full width at half maximum (FWHM) of 331 arcsec and surface roughness of 2.4 nm over 10 μm×10 μm. 8-μm-diam diodes were fabricated by standard mesa process. I-V characteristic of the diodes shows negative conductivity at room temperature and a peak current density of 1.79×105 A • cm-2 was achieved. © 2024 SPIE.

关键词： Resonant tunneling diodes

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Metamaterial Inspired Antennas for Gain Enhancement - A Review

Metamaterial Inspired Antennas for Gain Enhancement - A Revi...

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International conference on Communication and Electronics Systems (ICCES)

作者： Umra Aijaz Ruchi Department of Electronics and Communication Engineering Chandigarh University India

Metamaterials are distinguished by their peculiar electromagnetic properties and contribute an important role in antenna design. Most current developments related to the creation of metamaterial-implemented antennas are reviewed in-depth in this study. To acquire a better understanding of the theory of metamaterials and its underlying principles, a brief introduction is given. the most modern improvement in antenna minimization, gain, and isolation augment using metamaterials is further examined. the focus is on real-world, superior-performing metamaterial antenna applications that are anticipated to be crucial to wireless communications in the future. Additionally, the paper discusses and presents a few design problems that call for additional study and development.

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