Beam-dynamics design and performance of the RF deflector in the Los Alamos single-beam funnel experiment

We discuss the longitudinal beam dynamics in storage rings in the presence of a higher-harmonic cavity (HHC) system for bunch lengthening. First, we review the general conditions for HHC operations, both in active or passive modes, assuming the stability of the system. For uniform filling patterns, a distinction is made between operations with a normal-conducting HHC, where optimal conditions for bunch lengthening can be satisfied, and operations with a super-conducting HHC, where optimal conditions can be met only approximately. Second, we discuss the option to operate the NSLS-II storage ring with a passive, super-conducting third harmonic cavity (3HC) system. The stability and performance of the system in the presence of a gap in the uniform filling, which corresponds to the present mode of operation of the NSLS-II storage ring, is investigated with self-consistent Vlasov–Fokker–Planck simulations performed with the code SPACE. [G. Bassi, A. Blednykh and V. Smaluk, Phys. Rev. Accel. Beams 19, 024401 (2016).]

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Design, Modeling, and Testing of Micromachined Piezoelectric Clamped-Clamped Beam Resonators

10.1115/imece2000-1106 ◽

2000 ◽

Author(s):

Brett Piekarski ◽

Don L. DeVoe ◽

Roger Kaul ◽

Madan Dubey

Keyword(s):

Exact Solution ◽

Dynamic Range ◽

Micro Electro Mechanical System ◽

Vacuum Pressure ◽

Quality Factors ◽

Single Beam ◽

Mems Resonators ◽

Solution Models ◽

Electromechanical Performance ◽

And Performance

Abstract The design, modeling, and performance of suspended piezoelectric clamped-clamped single-beam micro electro mechanical system (MEMS) resonators is reported. Resonators with frequencies between 171 kHz and 9.2 MHz have been fabricated, tested and compared to finite element and exact solution models. Resonator designs vary from 6- to 20-μm wide and 25- to 400-μm long. A model describing the electromechanical performance of the resonators is presented. Operation is demonstrated from a vacuum pressure of 20-mTorr to atmospheric with drive voltages as low as 2.5 mV and a dynamic range of greater than 40 dB. Devices exhibit loaded quality factors (Qs) greater than 1000 at a vacuum pressure of 20-mTorr.

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GPU acceleration and performance of the particle-beam-dynamics code Elegant

Computer Physics Communications ◽

10.1016/j.cpc.2018.09.022 ◽

2019 ◽

Vol 235 ◽

pp. 346-355 ◽

Cited By ~ 1

Author(s):

J.R. King ◽

I.V. Pogorelov ◽

K.M. Amyx ◽

M. Borland ◽

R. Soliday

Keyword(s):

Particle Beam ◽

Beam Dynamics ◽

Gpu Acceleration ◽

And Performance

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Characteristics and performance of the Los Alamos VUV beamline at the NSLS

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment ◽

10.1016/0168-9002(88)90383-x ◽

1988 ◽

Vol 266 (1-3) ◽

pp. 199-204 ◽

Cited By ~ 18

Author(s):

R.J. Bartlett ◽

W.J. Trela ◽

F.D. Michaud ◽

S.H. Southworth ◽

R.W. Alkire ◽

...

Keyword(s):

Los Alamos ◽

And Performance

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The High Intensity Proton Accelerator Facility

SciPost Physics Proceedings ◽

10.21468/scipostphysproc.5.002 ◽

2021 ◽

Cited By ~ 1

Author(s):

Joachim Grillenberger ◽

Christian Baumgarten ◽

Mike Seidel

Keyword(s):

High Intensity ◽

Particle Physics ◽

Condensed Matter ◽

Power Conversion ◽

Meson Production ◽

Beam Dynamics ◽

Proton Accelerator ◽

Accelerator Facility ◽

Muons And Neutrinos ◽

And Performance

The High Intensity Proton Accelerator Facility at PSI routinely produces a proton beam with up to 1.4 MW power at a kinetic energy of 590 MeV. The beam is used to generate neutrons in spallation targets, and pions in meson production targets. The pions decay into muons and neutrinos. Pions and muons are used for condensed matter and particle physics research at the intensity frontier. This section presents the main physics and technology concepts utilized in the facility. It includes beam dynamics and the control of beam losses and activation, power conversion, efficiency aspects, and performance figures, including the availability of the facility.

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EUV Astrophysics with ALEXIS: The Wide View

International Astronomical Union Colloquium ◽

10.1017/s0252921100035685 ◽

1996 ◽

Vol 152 ◽

pp. 7-14

Author(s):

Jeffrey Bloch

Keyword(s):

Low Cost ◽

Rapid Development ◽

Normal Incidence ◽

Space Mission ◽

Los Alamos ◽

X Ray ◽

Ground Station ◽

X Ray Imaging ◽

And Performance ◽

Imaging Sensors

The Array of Low Energy X-ray Imaging Sensors (ALEXIS) satellite is Los Alamos’ pathfinding small space mission achieving low cost and rapid development time for its technology demonstration and science goals. The ALEXIS satellite contains the ALEXIS telescope array, which consists of six EUV/ultrasoft X-ray telescopes utilizing normal incidence multilayer mirrors, microchannel plate detectors, and thin UV rejecting filters. Each telescope is tuned to a relatively narrow bandpass centered at either 130, 171, or 186 angstroms. Each telescope has a 33° field-of-view, and a resolution of ~ 0.25°. With each 50 s rotation of the satellite, the telescopes scan most of the anti-solar hemisphere of the sky. The spacecraft is controlled exclusively from a ground station located at Los Alamos.This paper discusses the characteristics and performance of the ALEXIS telescopes and the results from the mission in spite of the damage incurred to the spacecraft at launch.

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An evaluation of compiled single-beam bathymetry data as a basis for regional sediment and biotope mapping

ICES Journal of Marine Science ◽

10.1093/icesjms/fst154 ◽

2013 ◽

Vol 71 (4) ◽

pp. 867-881 ◽

Cited By ~ 26

Author(s):

Sigrid Elvenes ◽

Margaret F. J. Dolan ◽

Pål Buhl-Mortensen ◽

Valérie K. Bellec

Keyword(s):

Scientific Information ◽

Video Data ◽

Sediment Grain Size ◽

Sediment Distribution ◽

Single Beam ◽

Distribution Maps ◽

Full Coverage ◽

Performance Statistics ◽

And Performance ◽

Multibeam Data

Abstract Maps of surficial sediment distribution and benthic habitats or biotopes provide invaluable information for ocean management and are at the core of many seabed mapping initiatives, including Norway's national offshore mapping programme MAREANO (www.mareano.no). Access to high-quality multibeam echosounder data (bathymetry and backscatter) has been central to many of MAREANO's mapping activities, but in order to maximize the cost-effectiveness of future mapping and ensure timely delivery of scientific information, seabed mappers worldwide may increasingly need to look to existing bathymetry data as a basis for thematic maps. This study examines the potential of compiled single-beam bathymetry data for sediment and biotope mapping. We simulate a mapping scenario where full coverage multibeam data are not available, but where existing bathymetry datasets are supplemented by limited multibeam data to provide the basis for thematic map interpretation and modelling. Encouraging results of sediment interpretation from the compiled bathymetry dataset suggest that production of sediment grain size distribution maps is feasible at a 1:250 000 scale or coarser, depending on the quality of available data. Biotope modelling made use of full-coverage predictor variables based on (i) multibeam data, and (ii) compiled single-beam data supplemented by limited multibeam data. Using the same response variable (biotope point observations obtained from video data), the performance of the respective models could be assessed. Biotope distribution maps based on the two datasets are visually similar, and performance statistics also indicate there is little difference between the models, providing a comparable level of information for regional management purposes. However, whilst our results suggest that using compiled bathymetry data with limited multibeam is viable as a basis for regional sediment and biotope mapping, it is not a substitute. Backscatter data and the better feature resolution provided by multibeam data remain of great value for these and other purposes.

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Configuration and performance of the Los Alamos Aurora KrF/ICF laser system

10.1117/12.18470 ◽

1990 ◽

Cited By ~ 1

Author(s):

Thomas P. Turner ◽

Johnny E. Jones ◽

Stephen J. Czuchlewski ◽

Robert G. Watt ◽

Scott J. Thomas ◽

...

Keyword(s):

Laser System ◽

Los Alamos ◽

And Performance

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Transmission Scanning Electron Microscopy and Energy Analysis with the Siemens ELMISKOP 101

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100095509 ◽

1972 ◽

Vol 30 ◽

pp. 450-451

Author(s):

H. M. Thieringer

Keyword(s):

Objective Lens ◽

Transmission Microscopy ◽

Image Recording ◽

Mode Of Operation ◽

Scanning Transmission ◽

Electron Microscopes ◽

And Performance ◽

Convergent Beam ◽

Ray Path ◽

Beam Diffraction

It has repeatedly been show that with conventional electron microscopes very fine electron probes can be produced, therefore allowing various micro-techniques such as micro recording, X-ray microanalysis and convergent beam diffraction. In this paper the function and performance of an SIEMENS ELMISKOP 101 used as a scanning transmission microscope (STEM) is described. This mode of operation has some advantages over the conventional transmission microscopy (CTEM) especially for the observation of thick specimen, in spite of somewhat longer image recording times.Fig.1 shows schematically the ray path and the additional electronics of an ELMISKOP 101 working as a STEM. With a point-cathode, and using condensor I and the objective lens as a demagnifying system, an electron probe with a half-width ob about 25 Å and a typical current of 5.10-11 amp at 100 kV can be obtained in the back focal plane of the objective lens.

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