A petawatt pulsed-power accelerator can be driven by various types of electrical-pulse generators, including conventional Marx generators and linear-transformer drivers. The pulsed-power accelerator can be configured to drive an electrical load from one- or two-sides. ...

The RADLAC-II Module(RIIM) accelerator was converted to a double- pulse machine with a foilless-diode load. The injector performance was evaluated in the double-pulse mode for pulse separations less than 2 ms. Two different pulsed power configurations wer...

A radial-current aqueous resistive solution load was applied to characterize a laser triggered transformer-type accelerator. The current direction in the dummy load is radial and is different from the traditional load in the axial. Therefore, this type of dummy load has smaller inductance and ...

A radial-current aqueous resistive solution load was applied to characterize a laser triggered transformer-type accelerator. The current direction in the dummy load is radial and is different from the traditional load in the axial. Therefore, this type of dummy load has smaller inductance and ...

The RADLAC-II Module (RIIM) accelerator has been converted to a double-pulse accelerator with a foilless diode injector load. The diode/injector performance has been addressed in the double-pulse operation mode using two machine configurations to compare ...

... A Hewlett Packard electron beam accelerator, known as ... and tested under a pulsed power load ... The analyzer allows for fast, efficient measurements ...

... 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. ...

Simulations are presented for a laser-driven cyclotron autoresonance accelerator with a practical guide magnetic field, as produced by a single coil. Effects that are investigated include acceleration in the non-resonant magnetic field profile, reduced acceleration due to misalignment between the magnetic field axis and the laser beam ...

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 ...

The RADLAC-II Module (RIIM) accelerator has been converted to a double-pulse accelerator with a foilless diode injector load. The diode/injector performance has been addressed in the double-pulse operation mode using two machine configurations to compare two voltage regimes. In both cases, a ...

The report presents the findings of an investigation into the crash pulse of fixed-wing cargo aircraft and the resulting behavior of cargo restrained by load limiters. A crash pulse simulator computer program was developed that obtains acceleration-time h...

Described are the results of the experiments with the plasma gun used as a source of the atom pulse flow for ion loading of the compressed electron ring in a collective heavy ion accelerator. Two operating regimes of the plasma gun have been studied: with...

Some of the new high-energy pulse loads can be most economically powered with lead-acid batteries. For example, consider a 400 metric ton hypersonic passenger carrying airplane that could be accelerated to Mach 2.3 on a launch ramp. During the last second of a 3-g acceleration the plane's kinetic energy ...

In order to reduce the head loads on the injector electrodes and to raise the efficiency of electron capture during acceleration, small betatrons are provided with an injection system with a controlled three-electrode injector in which injection current pulse with steep leading and trailing edges is formed by the application of a ...

A compact 150-keV pulsed diode electron accelerator is described. The high-voltage shaper of the accelerator, which is based on a coaxial capacitor and a correcting network, is matched to the vacuum diode. Pulses with a duration of 20 nsec, an amplitude of up to 150 kV, a rise time of approximately 4 nsec, and a ...

We simulate fusion power plant driver efficiency by pulsing small induction cores at 5 Hz (a typical projected power plant repetition rate), with a resistive load in the secondary winding that is scaled to simulate the beam loading for induction acceleration. Starting from a power plant driver design that is based ...

BS>A pulsed neutron source was developed whose principal element is a sealed-off vacuum tube in which a discharge between titanium tritide surfaces produces tritons, which then are accelerated to a deuterium-loaded target. The construction of a tube producing approximately 10/sup 7/ neutrone in microsecond ...

Using a counterstreaming electron beam to support a nonlinear wakefield for particle acceleration is investigated theoretically. This scheme has the following advantages over the plasma wakefield accelerator (PWFA): (1) easier beam loading; (2) higher transformer ratio; and (3) easier beam-pulse shaping. ...

Heat load on acceleration grids by secondary particles such as electrons, neutrals, and positive ions, is a key issue for long pulse acceleration of negative ion beams. Complicated behaviors of the secondary particles in multiaperture, multigrid (MAMuG) accelerator have been analyzed using ...

Heat load on acceleration grids by secondary particles such as electrons, neutrals, and positive ions, is a key issue for long pulse acceleration of negative ion beams. Complicated behaviors of the secondary particles in multiaperture, multigrid (MAMuG) accelerator have been analyzed using ...

The ETA-II linear induction accelerator (LIA) is designed to drive a microwave free electron laser (FEL). Beam energy sweep must be limited to {plus minus}1% for 50 ns to limit beam corkscrew motion and ensure high power FEL output over the full duration of the beam flattop. To achieve this energy sweep requirement, we have implemented a pulse distribution ...

In the design of the Next Linear Collider (NLC), multi-bunch operation is employed to improve efficiency at the cost of substantial beam loading. The RF pulse that powers the accelerator structures will be shaped to compensate for the effect of the transient loading along the bunch train. This scheme has been ...

An adaptive feedforward control loop is provided to stabilize accelerator beam loading of the radio frequency field in an accelerator cavity during successive pulses of the beam into the cavity. A digital signal processor enables an adaptive algorithm to generate a feedforward error correcting signal functionally ...

... Accelerators and Colliders; Beam Dynamics; Applications and New Methods of Acceleration; New Methods; Linear Accelerators and Pulsed Power ...

The Argonne Wakefield Accelerator group develops accelerating structures based on dielectric loaded waveguides. We use high charge short electron bunches to excite wakefields in dielectric loaded structures, and a second (low charge) beam to probe the wakefields left behind by the drive beam. We report measurements ...

We confirm that for vanishingly small loading and large impact condition, it may be possible to generate solitons in a chain of grains that are characterized by Herkian contacts. For uniform or progressive loading conditions throughout the chain, one generates soft-solitons which are weakly dispersive in space and time. Under conditions of weak impact one ...

The physics of plasma-based accelerators driven by short-pulse lasers is reviewed. This includes the laser wake-field accelerator, the plasma beat wave accelerator, the self-modulated laser wake-field accelerator, and plasma waves driven by multiple laser pulses. The ...

The longitudinal coupling impedance for a number of lower passbands, bunch to bunch energy variation due to longitudinal wake fields, the beam loading compensation, some effects of production errors, and the rf pulse transmission through a detuned disk loaded accelerating section with finite wall conductivity have ...

The Relativistic Electron-beam Experiment, or REX accelerator, is a pulsed-power source capable of driving a 100-ohm load at 5 MV, 50 kA, 45 ns (FWHM) with less than a 10-ns rise and 15-ns fall time. This paper describes the pulsed-power modifications, mo...

The peak power delivered by the klystrons in the NLCRA (Next Linear Collider Test Accelerator) now under construction at SLAC is enhanced by a factor of four in a SLED-II type of R.F. pulse compression system (pulse width compression ratio of six). To ach...

The Z machine at Sandia National Laboratories (SNL) is the most powerful multi-module synchronized pulsed-power accelerator in the world. Rapid development of z-pinch loads on Z has led to outstanding progress in the last few years, resulting in radiative...

The exact solution for bending response of a massless cantilever beam carrying a concentrated tip mass is presented. The loading is a triangular base acceleration pulse. Timewise development of a visco-plastic hinge of variable length is traced as well as...

Very high driving pressures (tens or hundreds of GPa), are required to accelerate flier plates to hypervelocities. This loading pressure pulse on the fiber plates must be nearly shockless to prevent the plate from melting or vaporizing. This is accomplish...

... Descriptors : *ION ACCELERATORS, *LINEAR ACCELERATORS, SYMPOSIA, SEMICONDUCTOR DEVICES, PULSE GENERATORS, SOLID ...

... Descriptors : *Linear accelerators, *Particle accelerators, Pulse generators, Charged particles, Inductance, Capacitance, Translations, USSR. ...

... joint planning, national and international ... ACCELERATORS, *PROTON ACCELERATORS, PARTICLE ACCELERATOR TECHNIQUES ...

We study the interaction of short laser pulses tightly focused in a tiny volume proportional to the cube of the pulse wavelength (?3) with underdense plasma by means of real-geometry particle-in-cell simulations. Underdense plasma irradiated by relatively low-energy ?3 (and ?2 ) laser pulses is shown to be an efficient source of ...

This note describes a simple model developed to explore some of the properties of the pulse-line ion accelerator [1], here represented as a series of lumped elements, in the general parameter regime for the ''NDCX-1d'' experiments. The goals of this modeling are: to understand the evolution of various possible input ...

Laser-driven plasma-based accelerators, which are capable of supporting fields in excess of 100GV/m , are reviewed. This includes the laser wakefield accelerator, the plasma beat wave accelerator, the self-modulated laser wakefield accelerator, plasma waves driven by multiple laser pulses, and ...

The Advanced Test Accelerator (ATA) is a pulsed linear induction accelerator with the following design parameters: 50 MeV, 10 kA, 70 ns, and 1 kHz in a ten-pulse burst. Acceleration is accomplished by means of 190 ferrite-loaded cells, each capable of maintaining a 250 kV ...

... Title : EFFECTS OF SHAPE OF LOAD PULSE ON SHOCK-MITIGATING CHARACTERISTICS OF VERMICULITE CONCRETE AND A ...

The magnetic loading technique using pulsed power generators was first developed about a decade ago on the Z Accelerator, and has matured significantly. The recent development of small, pulsed power generators have enabled several key issues in isentropic compression experiments (ICE), such as panel design, sample ...

The magnetic loading technique using pulsed power generators was first developed about a decade ago on the Z Accelerator, and has matured significantly. The recent development of small, pulsed power generators have enabled several key issues in isentropic compression experiments (ICE), such as panel design, sample ...

The counting errors of gas discharge counters because of deadtime are elinninated by pulse operation. In connection with this, experiments with accelerators indicate the possibility of a hodographic system with pulse-operated counters. The counting characteristics, efficiency, and resolution of self- quenched counting tubes of ...

A fuel-injection control system for an internal combustion engine is described in which a basic pulse width, being calculated from the amount of intake air sucked into an internal combustion engine and the number of engine revolutions, is generated in synchronization with engine revolution, and a series of special injection pulses are generated ...

This paper presents a progress report on the development of a dielectric-loaded test accelerator in the Magnicon Facility at the Naval Research Laboratory (NRL). The accelerator will be powered by an 11.4-GHz magnicon amplifier that provides up to 25 MW of output power in a {approx}250-ns pulse at up to 10 Hz. The ...

The RADLAC-II Module(RIIM) accelerator was converted to a double- pulse machine with a foilless-diode load. The injector performance was evaluated in the double-pulse mode for pulse separations less than 2 ms. Two different pulsed power configurations were used to compare ...

... 5. Report Date Reduction of Incremental Load Factor Acceleration Data to August 1994 Gust Statistics ... ACCELERATION _____ _____ ...

When the CEBAF accelerator operates at 200 {mu}A beam current, the superconducting cavities run with high beam loading. The CEBAF RF system (including the cavities, klystrons, and control systems) has been measured to obtain the response to low frequency current fluctuations and to obtain the transient response to rapid changes in the beam current. The ...

The shorted air line stub used for subnanosecond pulsing of the grounded-grid cathode gun structure of the IRI 3 MV Van de Graaff electron accelerator is revised. Three-dimensional high-frequency field propagation calculations provide better insight into the performance of different geometrical shapes. Effects on rise- and decay time, and ringing on the ...

We describe a transparent dielectric grating accelerator structure that is designed for ultra-short laser pulse operation. The structure is based on the principle of periodic field reversal to achieve phase synchronicity for relativistic particles, however to preserve ultra-short pulse operation it does not resonate the laser field in ...

The shape of an rf pulse is distorted due to dispersion encountered in acceleration through traveling-wave linear accelerator structures. Simulations are made to ascertain the severity of this distortion in cavities designed to operate at various group velocities. The pulse suffers maximum degradation when ...

The intention of operating an electron linear accelerator subharmonically beam loaded for free electron laser application requires justification of the beam-loaded energy gain equation. The mode of operation typically planned is 5 to 10 nanocoulombs single RF cycle pulses at 25 to 50 nanosecond intervals. This ...

The Z-accelerator at the Sandia National Laboratories (SNL) was modified in 1996 to deliver a 20 MA pulse to a z-pinch load in 100 ns. The pulsed-power driver is a 36-module waterline accelerator. Each waterline contains four self-break switches as part of the pulse-forming ...

The design, construction, and bench testing of an X-band travelling-wave accelerating structure loaded with a permittivity=20 dielectric has been published recently by the Argonne Advanced Accelerator Group [1]. Here we describe a new program to build a test accelerator using this structure. The ...

The design launch load cases included acceleration loads, dynamic pressures, ... acceleration loads, dynamic pressure loads, and cabin pressure loads for ...

The use of colliding laser pulses to control the injection of plasma electrons into the plasma wake of a laser wakefield accelerator (LWFA) is a promising approach to obtaining GeV scale electron bunches with orders of magnitude smaller emittance and energy spread. Colliding pulse injection (CPI) is being explored experimentally by ...

At SLAC there has been a continuous need for the injection of very short bunches of electrons into the accelerator. Several time-of-flight experiments have used bursts of short pulses during a normal 1.6 micro-second rf acceleration period. Single bunch beam loading experiments made use of a short ...

Sandia National Laboratories is completing the construction phase of the Particle Beam Fusion Accelerator-1 (PBFA-1). Testing of the 36 module, 30 TW, 1 MJ output accelerator is in the initial stages. The 4 MJ, PBFA Marx generator provided 3.6 MA into water-copper sulfate load resistors with a spread from first to last Marx firing ...

The compression and acceleration of an external electron bunch into the laser wakefield is studied using 3D modeling with the LAPLAC code and compared to analytical predictions. It is shown, for a laser propagating in a plasma channel, that the nonlinear laser pulse dynamics together with the finite laser spot size influence the electron bunch compression ...

A tomographic method based on laser machining was used to resolve the electron injection and acceleration processes in a laser wakefield accelerator. It was found that all the electrons in the monoenergetic electron beam are injected at the same location in the plasma column and then accelerated with an ...

A pulse-forming network for generating an initial voltage pulse of duration substantially one microsecond or greater and for reforming the pulse as a voltage pulse with a time duration of no more than 100 nanoseconds and pulse rise time and pulse fall time of at most 20 ...

A high voltage pulse transformer (HVPT) is usually used as a charging device for the pulse forming line (PFL) of intense electron-beam accelerators (IEBAs). Insulation of the HVPT is one of the important factors that restrict the development of the HVPT. Until now, considerable effort has been focused on minimizing high field regions ...

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 ...

The National Institute for Science and Technology (NIST) wiggler has been loaded to the Continuous Electron Beam Accelerator Facility (CEBAF). The pulsed wire method [R.W. Warren, Nucl. Instr. and Meth. A272 (1988) 267] has been used to measure the field errors of the entrance wiggler half, and the net path deflection was calculated to ...