A Segmented Rail Surface (SRS) structure is described that eliminates restrike arcs by progressively disconnecting segments of the rail surface after the plasma armature has passed. This technique has been demonstrated using the Los Alamos MIDI-2 railgun. Restrike was eliminated in a plasma armature acceleration experiment using ...

A Segmented Rail Surface (SRS) structure is described that eliminates restrike arcs by progressively disconnecting segments of the rail surface after the plasma armature has passed. This technique has been demonstrated using the Los Alamos MIDI-2 railgun. Restrike was eliminated in a plasma armature acceleration experiment using ...

... Accession Number : AD0802381. Title : ACCELERATION SWITCH, ENVIRONMENTAL EVALUATION TESTS, ALLEN MODEL NO. 13115,. ...

... Descriptors : *HYDRAULIC SERVOMECHANISMS, HIGH TEMPERATURE, PERFORMANCE(ENGINEERING), ACCELERATION, RELIABILITY ...

BackgroundSnake venoms consist primarily of proteins and peptides showing a myriad of potent biological activities which have been shaped by both adaptive and neutral selective forces. Venom proteins are encoded by multigene families that have evolved through a process of gene duplication followed by accelerated evolution in the protein coding region.ResultsHere we report five ...

Circuit means is described for effecting inward transla- ' tory motion of the intensified terminal reflector field regions of a magnetic mirror plasma containment field with a simultaneous intensification of the over-all field configuration. The circuit includes a segmented magnetic field generating solenoid and sequentially actuated ...

We present a modular microwave excited electron cyclotron resonance type linear ion source concept that allows the adaptation of the ion beam dimensions to the requirements of the particular application. The ion beam current density profile is controlled by dividing the middle grid of a triple-grid system into segments of 2 cm width. Each segment is ...

We present a modular microwave excited electron cyclotron resonance type linear ion source concept that allows the adaptation of the ion beam dimensions to the requirements of the particular application. The ion beam current density profile is controlled by dividing the middle grid of a triple-grid system into segments of 2 cm width. Each segment is ...

A group at Lawrence Berkeley Laboratory has reported an elegant CMOS VLSI circuit for amplifying, discriminating, and encoding the signals from highly-segmented charge output devices, e.g., silicon strip detectors or pad readout structures in gaseous detectors. The design exploits switched capacitor circuits and the well-known time structure of data ...

A multielectrode device housed in an insulator vacuum vessel, the metal vapor vacuum switch has high

... DIELECTRIC-CHARGING EFFECTS IN RF MEMS CAPACITIVE SWITCHES (PREPRINT) ... Charging Effects in RF MEMS Capacitive Switches ...

BackgroundSnake venom toxins evolve more rapidly than other proteins through accelerated changes in the protein coding regions. Previously we have shown that accelerated segment switch in exons to alter targeting (ASSET) might play an important role in its functional evolution of viperid three-finger toxins. In ...

The escapement controlled, inertially responsive safety and arming switch is for use in missiles. All moving parts with the exception of the inertial mass 'sees' its design acceleration. The escapement is not exercised by spurious random accelerations.

The disclosure relates to an improved integrating acceleration switch of the type having a mass suspended within a fluid filled chamber, with the motion of the mass initially opposed by a spring and subsequently not so opposed.

The disclosure relates to an improved acceleration switch, of the type having a mass suspended within a chamber, having little fluid damping at low g levels and high fluid damping at high g levels.

... CHARGING IN RF MEMS CAPACITIVE SWITCHES (PREPRINT) ... Page 4. Acceleration of Dielectric Charging in RF MEMS Capacitive Switches ...

... Accession Number : AD0801630. Title : ACCELERATION LIMIT SWITCH (LEAR 3010-600) PRELIMINARY PERFORMANCE EVALUATION,. ...

A fast, efficient and reliable switch is the basic ingredient of a pulse power accelerator. Two switches have been proposed so far: the solid state switch, and the vacuum photodiode switch. The solid state version has been tested to some extent, albeit at...

... Title : An Investigation of Accelerating Mechanisms in a Plasma Focus Relevant to Interrupting Switches. Descriptive Note : Rept. no. ...

The Fermilab accelerator is comprised of four major systems: the high-energy beam-extraction and switching system, the main accelerator (main ring), the booster, and the linear accelerator. The Fermilab accelerator produces accelerated beams for a vigorou...

A new method using a double-sensor difference based algorithm for analyzing human segment rotational angles in two directions for segmental orientation analysis in the three-dimensional (3D) space was presented. A wearable sensor system based only on triaxial accelerometers was developed to obtain the pitch and yaw angles of thigh ...

Fast, low jitter command triggered switching is key to the successful implementation of the dielectric wall accelerator (DWA). We are studying a UV induced vacuum surface flashover switch for this purpose. We present our initial data using a Nd:YAG laser ...

Selected examples of advanced accelerator concepts are reviewed. Such plasma accelerators as plasma beat wave accelerator, plasma wake field accelerator, and plasma grating accelerator are discussed particularly as examples of concepts for accelerating relativistic ...

High power switching of electromagnetic wave energy with a small, lightweight switching device is realized by mechanically rotating one or both of the quarter wavelength transmission line segments of a hybrid coupler. Each of the quarter wavelength transm...

Low pressure switches and magnetic switches were tested as possible replacements for the high pressure switches currently used on Experimental Test Accelerator and Advanced Test Accelerator. When the low pressure switch is used with a low impedance transmission line, ...

This patent describes an electromagnetic railgun having electrically conductive segments overlying but insulated from the rails. Switches are connected between each segment and its underlying rail. As a projectile and its plasma armature pass each segment, the switch associated with that ...

An electromagnetic railgun having electrically conductive segments overlying but insulated from the rails. Switches are connected between each segment and its underlying rail. As a projectile and its plasma armature pass each segment, the switch associated with that segment ...

... This Plasma Opening Switch (POS) is able to ... PLASMA DEVICES, *SWITCHES, *PARTICLE ACCELERATORS ... HIGH POWER, OPENING(PROCESS ...

BS>A device is descrined for producing nuclear fusion reactions by additional acceleration of a hydrogen isotope plasma formed and initially accelerated by a collapsing magnetic field. The plasma is enclosed in a toroidal cavity within a vessel composed of a plurality of insulated coaxial segments. The added ...

These documents describe the assembly and alignment of the typical accelerator 40-foot segments of the Stanford Linear Accelerator Center's three-kilometer linear accelerator. Required tools and special equipment are listed along with instructions for their use. Tolerances are specified for all phases of ...

... joint loadings, contact forces and segment positions for a 15-segment model of a human body subjected to high accelerations and wind loads. ...

... Accession Number : ADA215836. Title : Biaxial Finite Deformations of Arterial and Benous Segments under Plus or Minus Gz Acceleration Stress. ...

A multielectrode device housed in an insulator vacuum vessel, the metal vapor vacuum switch has high power capability and can hold off voltages up to the 100 kilovolt level. Such switches can be electronically triggered and can interrupt or commutate at a...

This paper describes the development and testing of an SF sub 6 -insulated, multistage laser-triggered gas switch for use in the Hermes-III accelerator at Sandia National Laboratories. Twenty of these switches are used in Hermes III to transfer energy fro...

This report summarizes the presentations and the findings of the Workshop on High Average Power Switching (WHAPS) that took place in Livermore, California, on October 10--11, 1990. The WHAPS discussed switching technologies that could meet requirements th...

A 6cm radius, single stage, electron accelerator that uses a photoconductive switch to couple an electromagneticpulse into a radial transmission line is being developed. The switch consists of a ring GaAs which is closed with a ring of a laser light from ...

B cells can exchange gene segments for the constant region of the immunoglobulin heavy chain, altering the class and effector function of the antibodies that they produce. Class switching is directed to distinct classes by cytokines, which induce transcription of the targeted DNA sequences. These transcripts are processed, resulting in spliced ...

... Electric guns, *Particle accelerators, Energy transfer, Electric switches, Hydrides, Refrigeration systems, Feasibility studies, Transmission lines. ...

A microelectromechanical (MEM) acceleration switch is disclosed which includes a proof mass flexibly connected to a substrate, with the proof mass being moveable in a direction substantially perpendicular to the substrate in response to a sensed acceleration. An electrode on the proof mass contacts one or more electrodes located below ...

Fast, low jitter command triggered switching is key to the successful implementation of the dielectric wall accelerator (DWA). We are studying a UV induced vacuum surface flashover switch for this purpose. We present our initial data using a Nd:YAG laser incident onto a high gradient insulator surface at 1{omega}, 2{omega}, and ...

Jul 10, 2002... levitated vehicle, or "bucket," accelerated by a linear synchronous motor. ... segments of accelerating coils on the linear synchronous motor. ...

The Podcast: Inertia and Acceleration is a segment of the Web Seminar: NSTA Press Force and Motion: Stop Faking It! I , December 11, 2008. The pod

The Podcast: Acceleration is a segment of the Force and Motion Short Course. The podcast is 2 minutes 13 seconds in duration. Presented by science experts and NSTA staff, the NSTA Online Short Courses are professional development opportunities de

The low energy beam transport (LEBT) of the Spallation Neutron Source (SNS) accelerator consists of two electrostatic lenses, of which the second is split into four electrically-isolated segments. Adding fast pulsed voltages to the lens high voltage creates the transverse fields required for beam chopping. Electric sparks, however, create transients that ...

... To do this the system was considered in the following segments: Electron injection electronics, Electron beam injection hardware, Accelerating ...

The listed drawings provide partial information for constructing a high-power waveguide switch. The drawings mainly are definitive about the Hybrid coupler portion of the SLAC Injector wave guide switch. This switch is used to switch the injector accelerator section and a dummy load between two ...

The Segmented Rail Phased Induction Motor (SERAPHIM) is a compact, pulsed linear induction motor (LIM) offering a unique capability for very high speed train propulsion. It uses technology developed for the Sandia coilgun, an electromagnetic launcher designed to accelerate projectiles to several kilometers per second. Both aluminum cylinders and plates ...

The plasma gate switch is a novel technique for producing a long conduction time vacuum opening switch. The switch consists of an aluminum foil which connects the cathode to the anode in a coaxial geometry. The foil is designed so that the maximum axial acceleration is in the center of the foil and that at the ...

The operation principle of the Astron electron accelerator is an accelerating induction electric field generated by changing the magnetic flux in a ferromagnetic material. The accelerator consists of a number of identical modular units. Each unit is cavity loaded with a ring-shaped laminated silicon steel core. The primary ...

An apparatus for accelerating heavy ions to high energies and directing the accelerated ions at a target comprises a source of singly ionized heavy ions of an element or compound of greater than 100 atomic mass units, means for accelerating the heavy ions, a storage ring for accumulating the accelerated heavy ions ...

To extend the scope of physics experiments the EhGP-10M accelerator is switched on to pulse operation. Specifications of the nanoseocnd duration pulse shapers are given, so are the results of accelerator pulse regime study. The source of the negatively ch...

This report discusses the suitability of four novel particle acceleration technologies for multi-TeV particle physics machines: laser driven linear accelerators (linac), plasma beat-wave devices, plasma wakefield devices, and switched power and cavity wak...

This report discusses the following topics: electron trajectories and magnetic insulation; blade-load simulation studies; azimuthal asymmetries; MAGIC simulation studies of a segmented plasma opening switch; PBFA II calculations with different spatial res...

... Non-Menthol Among those Switching in Past Year ... Retail marketing includes merchandising, point of sale advertising ... incentives to best present PM USA's cigarette ...

... BHP GT GT GT ... Headers to be demodulated & decoded on board ('regenerative path') Figure 1: Burst segmentation and its associated BHP ...

In the pipe segment tests, two systems were used to detect specimen failure. The first system had a switch positioned over the centerline of the welds. If a ...

We address light propagation in segmented waveguide arrays where the refractive index is longitudinally modulated with an out-of-phase modulation in adjacent waveguides, so that the coupling strength varies along the propagation direction. Thus in resonant segments coupling may be inhibited hence light remains localized, while in detuned ...

This paper describes the control system of the injector for the LINAC-800 linear electron accelerator. The architecture of the control system, the equipment, and software are presented. This system is part of the first segment of the control system of the LINAC-800 electron accelerator.

Recent developments in spacecraft and high performance aircraft have resulted in the exposure of the human body to the hazards of high accelerations beyond tolerance levels. Circulatory impairment is one of the manifestations of acceleration trauma. A maj...

Methods and apparatuses for electrically controlled optical switches are presented. An electrically controlled optical switch includes a fixture formed using a laminated dielectric material, a first optical fiber having a fixed segment supported by the fixture and a movable segment extending into a cavity, a second ...

We describe a new concept for a microwave circuit functioning as a charged-particle accelerator at mm wavelengths, permitting an accelerating gradient higher than conventional passive circuits can withstand consistent with cyclic fatigue. The device provides acceleration for multiple bunches in parallel channels, and permits a short ...

A compact proton accelerator for medical applications is being developed at Lawrence Livermore National Laboratory. The accelerator architecture is based on the dielectric wall accelerator (DWA) concept. One critical area to consider is the switch region. Electric field simulations and thermal calculations of the ...

Laser-switched power surges for particle accelerators, just as with direct laser-driven accelerator schemes, place unique demands on the specifications of the invoked laser systems. We review the laser requirements for switched power sources of the types described in other chapters of this volume. The relative ...

The dielectric wall accelerator (DWA) is a compact induction accelerator structure that incorporates the accelerating mechanism, pulse forming structure, and switch structure into an integrated module. The DWA consists of stacked stripline Blumlein assemblies, which can provide accelerating ...

The dual ion beam accelerator system has been developed for simulation studies of neutron radiation damage of structural materials for nuclear fusion and fission reactors. One accelerator is used to accelerate two different kinds of ions, which are generated in the ion source simultaneously. One of these ions is selected alternatively ...

Experiments were performed on a fast risetime, self-breakdown, multichannel oil switch (for high-voltage accelerators) giving an average switch risetime (10 to 90%) of 5.7 nsec and an average of 12 arc channels per pulse. The apparatus consisted of a 140 kJ Marx generator which charged an intermediate energy store, an SF6 gas ...

A theoretical model for the plasma erosion opening switch (PEOS) which predicts its voltage, current and impedance history as a function of the input waveforms, geometry and switch parameters are presented. Scaling laws for the switch operation are developed from this model. Systems requirements for pulse compression and power ...

This report summarizes the presentations and the findings of the Workshop on High Average Power Switching (WHAPS) that took place in Livermore, California, on October 10 to 11, 1990. The WHAPS discussed switching technologies that could meet requirements that arise in applications of linear induction accelerators also known as ...

A betatron accelerator is described which consists of: an annular betatron tube having a vacuum chamber therein in which charged particles are to be accelerated, a magnetic circuit including an axial magnetic core along the axis of the tube, accelerating flux producing means for producing a changing accelerating ...

The first results of experiments using plasma opening switches for inductive energy storage are described. The switch has been shown to conduct up to 200-kA current for approx.50 ns then to open in <10 ns, transferring the current to an electron beam load. Inductive energy storage, pulse compression, and power multiplication are demonstrated. A simple ...

A toggle map is a set of toggle switches that allows the manipulation of several switches with a single mouse drag interaction. Because toggles switches are functionally equivalent to black and white pixels interaction techniques from paint programs can be adopted for this task. A controlled experiment shows that toggle maps can speed ...

A sequentially pulsed traveling wave compact accelerator having two or more pulse forming lines each with a switch for producing a short acceleration pulse along a short length of a beam tube, and a trigger mechanism for sequentially triggering the switches so that a traveling axial electric field is produced along ...

The new low level rf system for the light ion acceleration program features direct digital control of a phase continuous rf synthesizer clocked by finite changes in the B field. The system, its operation and testing are described. The system covers the complete rf frequency range and switches over from single cavity acceleration to ...

PBFA II is a 36-module ion accelerator built by Sandia National Laboratories for inertial confinement fusion studies. In the water-filled, pulse-forming section of the accelerator, each module is fitted with a 5.0-MV, SF sub 6 -filled gas switch located b...

Low-pressure switches and magnetic switches have been tested as possible replacements for the high-pressure switches currently used on Experimental Test Accelerator (ETA) and Advanced Test Accelerator (ATA). When the low-pressure switch is used with a low-impedance ...

Optical bistability in two-segment diode lasers with inhomogeneous injection is considered. Analytical solution of the rate-equation model gives a simple bistability condition. Slower carrier recombination in the absorber relative to the gain region is required for bistability when the gain and the absorber optical cross sections are equal. Carrier lifetimes, ...

This patent describes an apparatus for connecting the return spring of a throttle linkage to a movable accelerator for immediately shutting down the engine of a motor vehicle when the throttle fails in an open position. It includes: a switch housing attached to an accelerator means such that the switch housing will ...

The purpose of this note is to point out that since bunch narrowing naturally occurs in the acceleration process in the vicinity of transition, it should be possible to switch over to the high frequency system close to transition when the bunch has narrow...

Particle Accelerators require high voltage and often high power. Typically the high voltage/power generation utilizes a topology with an extra energy store and a switching means to extract that stored energy. The switches may be active or passive devices....

The optical switching properties of a photochromic spirooxazine compound in retrofit polyester film and in poly(vinyl butyral) have been measured. The light fatigue resistance of these two optical switching elements were tested by an accelerated method. T...

We report on the first experimental investigation of the use of a magnetically accelerated foil: moving foil: as a vacuum opening switch. One megampere, 60% of the total current, was transferred to a low inductance path in 800 ns.

The formation of fast pulses from a current charged transmission line and opening switch is described. By employing a plasma focus as an opening switch and diode in the prototype device, a proton beam of peak energy 250 keV is produced. The time integrate...

A fast, efficient and reliable switch is the basic ingredient of a pulse power accelerator. Two switches have been proposed so far: the solid state switch, and the vacuum photodiode switch. The solid state version has been tested to some extent, albeit at low (few kilovolts) level, with ...

These proceedings contain most of the presentations given at a workshop on the current state of research in techniques for switched power acceleration. The proceedings are divided, as was the workshop itself, into two parts. Part 1, contains the latest results from a number of groups active in switched power research. The major topic ...

An acceleration-sensing apparatus is disclosed which includes a moveable shuttle (i.e. a suspended mass) and a latch for capturing and holding the shuttle when an acceleration event is sensed above a predetermined threshold level. The acceleration-sensing apparatus provides a switch closure upon sensing the ...

Early in its differentiative pathway, a given B lymphocyte expresses immunoglobulin of the mu heavy chain class (IgM). Subsequent differentiative processes may involve rearrangement within the immunoglobulin heavy chain chromosomal locus to enable cells of the same lineage to synthesize immunoglobulins of other heavy chain classes (e. g. IgG, IgE or IgA), but with specificity for the same antigen ...

The Fermilab accelerator is comprised of four major systems: the high-energy beam-extraction and switching system, the main accelerator (main ring), the booster, and the linear accelerator. The Fermilab accelerator produces accelerated beams for a vigorous international ...

This patent describes a diagnostic system for a kickdown switch in an automotive vehicle which comprises an engine, an automatic transmission, an accelerator pedal, and a throttle opening sensor for detecting the degree of depression applied to the accelerator pedal, the automatic transmission being adapted to be prohibited from ...

... accelerator with a thyristor-charging unit, a magnetic pulse compressor, a solid state opening switch, an electron beam diode load and an X-ray convertor (Fig. ...

... Electron beams are often cathode-limited for applications including high power microwaves and as sources for accelerators and particle beams. ...

The model explains the differences in morphology and ,Mach number between FR I and ..... a marriage between the disk acceleration model of Blandford ...

, such bistable switches could represent an important principle underlying embryonic patterning. Developmental bistable steady-state switch that can occur in this window can explain the coordi- nated segmental gene movement of the bistability window (Fig. 11). Existence of the switch predicted by the model is ...

, a burst header packet (BHP) is sent, which is processed electronically at each core node to set up the optical switching fabric. The BHP specifies the arrival time and duration of the burst so the switch knows-optically. Note, the resource reservation is one-way. There is no acknowledgment sent back once the BHP reaches

Variable plasma jet velocity with low beam divergence over a range of mass flow rates can be achieved through segmented electrode operation of Hall plasma accelerator. With the use of just a cathode side electrode at the cathode potential, the beam diverg...

Biomechanical model assumptions affect the interpretation of the role of the muscle or joint moments to the segmental power estimated by induced acceleration analysis (IAA). We evaluated the effect of modeling the pelvis and trunk segments as two separate segments (8 SM) versus as a single ...

During 1987 and 1988, Plasma Opening Switch (POS) experiments have been continued with the goal of providing voltage and power gain on the PBFA II ion beam accelerator at Sandia National Laboratories. The experiments have developed a POS that has a rugged plasma source, will open rapidly, and will couple to a high-impedance load. The initial erosion ...

At the interface between the sensory transduction system and the flagellar motor system of Salmonella typhimurium, the switch complex plays an important role in both sensory transduction and energy transduction. To examine the function of the switch complex, we isolated from 10 cheY mutants 500 pseudorevertants with a suppressor mutation in one of the ...

The dominant trend in the development of pulsed power accelerator technology over the last decade has been towards higher power and shorter pulse widths. Limitations in high voltage, high current switch performance, and in power flow through vacuum insula...

In applications where multiple magnetic modulators are used to drive a single Linear Induction Voltage Adder (LIVA) or Linear Accelerator (LINAC), it is essential that the outputs of the modulators by synchronized. Output rise times are typically in the 1...

The Los Alamos Meson Physics Facility (LAMPF) consists of a linear accelerator with multiple target systems, where the particle beam is being switched into separate channels to be aimed at discrete terminals to perform a variety of functions. The beam is ...

The problems of magnetic field formation in a collective accelerator model are considered. An excellent agreement of the calculated and measured magnetic field distributions in a thick-walled metallic chamber at the separate switching of the magnetic syst...

A method is suggested for measuring the accelerated particle distributions by radial-phase oscillation amplitudes. Experimental distribution measurements, and the derived half-width dependence of the accelerated cluster on energy and switching time is in a good agreement with theoretical data. (tr- auth)

A second-generation ionization-front accelerator system (IFA-2) is being brought into operation. Results of IFA-2 IREB optimization experiments, laser-characterization experiments, beam-switch experiments, and laser-deflector experiments are presented. Th...

Recent developments in untriggered oil and water switching now permit the construction of compact, high energy density pulsed power sources for laser excitation. These accelerators, developed principally for electron beam fusion studies, appear adaptable ...

A 3 MV, 800 kA, 24 ns electron beam accelerator is described and the results of initial switching experiments are discussed. The generator will provide a source for studying the physics of processes leading to electron beam driven, inertially confined fus...

The study is addressed to the development of accelerated reliability test methods for long lived mechanical and electromechanical parts. The parts studied were a subminiature snap-action switch, a crystal can relay, a mechanical seal, and a rubber timing ...

Describes a demonstration of Coriolis acceleration. Discusses two different meanings of "Coriolis" and two causes of Coriolis acceleration. Gives a set-up method of the demonstration apparatus by using a rotary disk with rubber tubing for tap water, switches, lamps, battery, and counterweight. Provides two pictures with operating ...

The cermet version of the MC2965 vacuum switch tube was tested in three different circuits to determine the dependency of the tube's switching delay and jitter on trigger current, anode voltage, and rate of rise of anode current. The results were then compared with two physical models of switch closure time - one dependent on the ...

This paper introduces the basic aspects of magnetic switching and magnetic pulse compression circuits, which can be used for charging a switched power linac (SPL) transmission line structure. The magnetic power conditioning scheme is illustrated by using the 1-km, 1-TeV injector in the Eloisatron Collider as a system example. Switched ...

The operating characteristics of a plasma-filled fast-opening switch and its performance in pinching experiments on Sandia's Proto I accelerator (double sided, 2 MV, 7.2 ..cap omega.., 24 nsec each side) are described. The growth of a sheath between the plasma and the cathode of the switch is the mechanism responsible for the ...

This video segment adapted from NOVA shows how the particle accelerator helped physicists find parts of the atom even smaller than protons and neutrons.

Horizontal Gene Transfer (HGT) Greatly Accelerates Genome Evolution and Innovation : ... Gene structure prediction in syntenic DNA segments. ...

This study involved the use of explosively accelerated steel segments (helicopter or other aircraft deliverable to cut trees followed by debris clearance due to overpressure for possible use in Vietnam.

This video segment adapted from NOVA describes a simple experiment that confirmed the idea that microbes can accelerate the biogeochemical process of cave formation.

... most models that describec th it cardiovascular system response to acceleration stress had considered only radia I~slac'~vt5of the vessel wall . ...

In intensity-modulated radiation therapy (IMRT), fluence matrices obtained from a treatment planning system are usually delivered by a linear accelerator equipped with a multileaf collimator (MLC). A segmentation method is needed for decomposing these fluence matrices into segments suitable for the MLC, and the number of ...

Future applications of linear and recirculating induction accelerators include microwave sources for plasma heating and linear colliders, industrial manufacturing processes, and heavy ion fusion. These applications require pulsed sources capable of sustained operation at high pulse-repetition rates. Powering these new accelerators places severe ...

A compact, short pulse, repetitive accelerator has many useful military and commercial applications in biological counter proliferation, materials processing, radiography, and sterilization (medical instruments, waste, and food). The goal of this project was to develop and demonstrate a small, 700 kV accelerator, which can produce 7 kA particle beams with ...

The theoretical performance of diagonal conducting wall crossed-field accelerators is examined on the basis of an infinite segmentation assumption using a cross-plane averaged generalized Ohm s law for a partially ionized gas, including ion slip. The desi...

The theoretical performance of diagonal conducting wall crossed field accelerators is examined on the basis of an infinite segmentation assumption using a cross-plane averaged generalized Ohm's law for a partially ionized gas, including ion slip. The desi...

The Department of Energy (DOE) is working to accelerate the acceptance and application of innovative technologies that improve the way the nation manages its environmental remediation problems. The DOE Office of Science and Technology established the Acce...

With the successful completion of the main accelerator in 1994 the alignment emphasis at the Thomas Jefferson National Accelerator Facility (formerly CEBAF) switched to the continuing installation and upgrades in the three experimental halls. This presentation examines the techniques used in completing the CEBAF machine and also gives ...

Progress in electronic power conversion technology is making possible a new class of induction linacs that can operate at extremely high repetition rates. Advances in insulator technology, pulse forming line design and switching may also lead to a new type of high current accelerator with accelerating gradients at least an order of ...

An acceleration-responsive device with dual channel capabilities whereby a first circuit is actuated upon attainment of a predetermined maximum acceleration level and when the acceleration drops to a predetermined minimum acceleriltion level another circuit is actuated is described. A fluid-damped sensing mass slidably mounted ...

The dynamics of a synthetic antiferromagnet (a metallic trilayer) have been explored and are shown to exhibit ultrafast switching on a time scale of tens of ps. This conclusion is based on first-principles, atomistic spin dynamics simulations. The simulations are performed at finite temperature, as well as at T=0 K (the macrospin limit), and we observe a marked temperature ...

A theoretical model for the plasma erosion opening switch (PEOS) is presented which predicts its voltage, current and impedance history as a function of the input waveforms, geometry and switch parameters. Scaling laws for the switch operation are developed from this model. Systems requirements for pulse compression and power ...

A method for generating a sequence of intensity-modulated radiation therapy step-and-shoot plans with increasing number of segments is presented. The objectives are to generate high-quality plans with few, large and regular segments, and to make the planning process more intuitive. The proposed method combines segment generation with ...

An electron-bombardment ion source has a chamber into which an ionizable propellant is introduced. Electrons flowing from a cathode to an anode serve to ionize the propellant. The resulting ions are accelerated out of the chamber. To increase the efficiency of ionization of the propellant by the electrons, a magnetic field is established within the chamber. To that end, there ...

This patent describes an apparatus for deriving an alternating current electrical output signal having a preselected waveform and frequency from a variable higher frequency alternating current electrical input signal. The apparatus comprises: input terminals for receiving an input signal and output terminals for connection to an electrical load; dividing means connected to the input terminals for ...

We present a simple integrated circuit model of an excitable nerve axon based on a rotating switch. The heart of the circuit consists of two integrated circuits-a dual rotating switch and a quad comparator. Both the passive and active response of a segment of axon membrane are modeled. A single segment exhibits ...

Short communication All joint moments significantly contribute to trunk angular acceleration: Accepted 19 April 2010 Keywords: Gait Trunk control Balance Angular acceleration Sensitivity a b s t r a c can produce linear and angular acceleration of all body segments (including those on which the moment

The accelerator mass spectrometry programme and the related developments based on the BARC-TIFR Pelletron accelerator is described. A segmented gas detector and beam chopper control electronics have been developed for conducting 36Cl measurements. Distinct energy loss characteristics of the gas detector and beam chopper performance are ...

A correlation is established between repetitions of leading syllables in the songs of Cardinals and those which follow. The time intervals following repeated syllables relate first to acceleration at the beginning of a song but as the song progresses they relate more directly to the duration of the syllables. On the other hand the switch-intervals between ...

The energy output and reliability of the multi-joule, injection-locked KrF laser used to trigger the PBFA II accelerator gas switches were improved through modifications identified in modeling the Blumlein driver circuit for the power oscillator. A combin...

The formation of fast pulses from a current charged transmission line and opening switch is described. By employing a plasma focus as an opening switch and diode in the prototype device, a proton beam of peak energy 250 keV is produced. The time integrated energy spectrum of the beam is constructed from a Thomson spectrograph. Applications of this device ...

The formation of fast pulses from a current charged transmission line and opening switch is described. By employing a plasma focus as an opening switch and diode in the prototype device, a proton beam of peak energy 250 keV is produced. The time integrated energy spectrum of the beam is constructed from a Thomson spectrograph. Applications of this device ...

energy when switching to a single-well trap, resulting in two packets of molecules that are accelerated ND3 molecule in the center of one of the wells when switching to the single-well configuration in direction. Therefore, when switching the dipole field off to produce a single-well trap, molecules

A new type of an opening switch which operates in vacuum and opens on a nanosecond timescale at voltages > 1 MV is described. This Plasma Opening Switch (POS) is able to conduct several hundred kiloamperes for approx. 50 nsec while a vacuum inductor is ch...

Computer simulations demonstrate that the entrainment (or advection) of magnetic field with the flow of cathode-emitted electrons can constitute a dominant mechanism for the magnetic field penetration of erosion switch plasmas. Cross-field drift in the accelerating electric field near the cathode starts the penetration process. Plasma erosion propagates ...

Apparatus for conditioning high voltage pulses from particle accelerators in order to shorten the rise times of the pulses. Flashover switches in the cathode stalk of the transmission line hold off conduction for a determinable period of time, reflecting the early portion of the pulses. Diodes upstream of the switches divert energy ...

Contact resistance data for three commercial-grade nickel alloys are presented. These data were obtained under stationary and wiping conditions for the metals exposed to atmospheric contaminants under accelerated oxidizing conditions. The results indicate that these nickel alloys are suitable inexpensive substitutes for precious metal electrical contact materials in ...

Proton accelerator structures for medical applications using Dielectric Wall Accelerator (DWA) technology allow for the utilization of high electric field gradients on the order of 100 MV/m to accelerate the proton bunch. Medical applications involving cancer therapy treatment usually desire short bunch lengths on the order of hundreds ...

The radiographic integrated test stand (RITS-3) is a 5-MV, 160-kA, 70-ns inductive voltage adder accelerator at Sandia National Laboratories used to develop critical understanding of x-ray sources and flash radiographic drivers. On RITS-3 three pulse forming lines (PFLs) are used to drive three inductive voltage adder cavities. Each PFL contains a fast-pulse-charged, ...

The operation of electromagnetic rail launchers requires switching large currents. For rail gun accelerators with driving currents of some MA it is important to keep the resistance of the total energy supply circuit small compared to that of the moving projectile, which is velocity dependent and low. Among the great variety of switches ...