... ACCELERATORS, NEUTRON FLUX), NEUTRON ... REACTIONS, REACTOR CORES, ELECTRON ... ELECTRON IRRADIATION, MEASUREMENT. ...
DTIC Science & Technology
Results of measurements of the properties of a pulsed neutron source are presented. The source consists of a slightly sub-prompt-critical fast reactor of uranium metal (93% U-235) shpere struck by a pulsed 29 MeV electron beam from a linear accelerator. T...
National Technical Information Service (NTIS)
Information required to obtain authorization to receive and use a fast critical assembly for operation with the General Atomic linear accelerator is documented. The analysis offers evidence showing that operation of the assembly will create no undue risk to the health and safety of the public or the ...
Energy Citations Database
Measurements of the fast neutron spectrum and angular distribution in a large assembly of paraffin wax (CH2) were performed. Two targets were irradiated with a pulsed electron beam from a linear accelerator, one an essentially point isotropic fission spec...
A fast pulsed excitation, electromagnetic undulator or wiggler, employing geometrically alternating substacks of thin laminations of ferromagnetic material, together with a single turn current loop excitation of the composite assembly, of such shape and configuration that intense, spatially alternating, magnetic fields are generated; ...
This patent describes a fast pulsed excitation, electromagnetic undulator or wiggler. It comprises geometrically alternating substacks of thin laminations of ferromagnetic material, together with a single turn current loop excitation of the composite assembly, of such shape and configuration that intense, spatially alternating, ...
DOEpatents
The 100 TW Particle Beam Fusion Accelerator (PBFA II) is well into the procurement and assembly phases, with the first shot scheduled for January 1986. Installation of several major sub-assemblies is underway. The PBFA II output will drive a fast opening ...
An improved pulsed ion beam source is disclosed having a new biasing circuit for the fast magnetic field. This circuit provides for an initial negative bias for the field created by the fast coils in the ion beam source which pre-ionize the gas in the source, ionize the gas and deliver the gas to the proper position in the ...
An improved pulsed ion beam source having a new biasing circuit for the fast magnetic field. This circuit provides for an initial negative bias for the field created by the fast coils in the ion beam source which pre-ionize the gas in the source, ionize the gas and deliver the gas to the proper position in the ...
DOE Information Bridge
The linear accelerator laboratory (SAL) at Saskatoon recently installed and commissioned a pulse stretcher ring for upgrading the performance of the existing SLAC style pulsed linac. Two fast electrostatic kickers were developed to deflect the ring's closed orbit for multiturn injections. The first kicker has been ...
NASA Astrophysics Data System (ADS)
An automated charge monitoring system for a linear accelerator electron beam was assembled for use at radiation intensities associated with industrial applications. The system is based on the fast integration of current signals from a toroidal pulse transforming coil wound around the ...
The intensity of the accelerated single bunched electron beam depends on the performance of the electron gun and the fast cathode pulser. The electron beam is emitted by a Y-796 cathode assembly with a cathode of 2 cm2 (8 A/cm2), and an extracted voltage of 90 kV. The maximum charge of the single bunched beam was attained at 1.5 ...
These short pulse width signals have a very large ...... detector signals and fast steering mirrors. Optical path-length control is implemented using ... the reaction wheel assembly (RWA). The results show that existing wheels can be used to meet .... Extractor and accelerator grids. Extractor grid only. ...
NASA Website
Assembly. Facility,. New Orleans,. La. At left is an H-1 kerosene/liquid oxygen engine, eight of ..... pulse to activate the cutters. Marshall Space Flight Center,. Electrically controlled .... accelerators which involve inter-. This test, conducted ..... so fast that determining the by October 25. Of these ...
and accurately aligned laser assembly that is capable of fast data Processing. producing ultra short pulses at a high repetition rate. It ...
... A pulsed-type experimental facility is being assembled to study the feasibility of a hypervelocity wind tunnel employing an MHD accelerator. ...
The 100 TW Particle Beam Fusion Accelerator (PBFA II) is well into the procurement and assembly phases, with the first shot scheduled for January 1986. Installation of several major sub-assemblies is underway. The PBFA II output will drive a fast opening switch in the vacuum insulator stack, providing a 30 MV, 15 ...
... response was also observed with fast motion pictures ... ence 1). The accelerator configuration employed for ... The pulsed magnetic field used for beam ...
... in shields. An electron linear accelerator (Linac) was used to produce intense 50-nsec pulses of photoneutrons. These ...
... source, particle beam accelerator, and particle ... at the WL, a fast capacitor bank, an ... AIR-CORE TRANSFORMER PULSED POWER DEVELOPMENT ...
The response to pulsed fast neutrons by a parafin moderated boron-lined proportional counter is investigated theoretically and experimentally. The neutrons pulses are generated by 60 MeV electrons from a linear accelerator. The calculation of the counting...
Fast and thermal neutron intensity distributions have been measured at an accelerator based prompt gamma ray neutron activation analysis (PGNAA) setup. The setup is built at the 350 keV accelerator laboratory of King Fahd University of Petroleum and Minerals (KFUPM). The setup is mainly designed to carry out PGNAA elemental analysis ...
An experimental arrangement designed for accurate measurements of low- energy neutron spectra was assembled and tested. A pulsed high-current electron linear accelerator was used to produce short bursts of fast neutrons that were introduced into a moderating and absorbing assembly. The ...
... of the sled and warhead assembly is shown ... 2.3 Schematic view of the contemplated warhead accelerator ... in the target bunker, a fast closing velve ...
... the accelerator cell load. ... for the output stage to minimize losses and provide fast ... is capable of powering a 0.5 MeV injector induction cell assembly. ...
... on semiconductor's re- I sponse to fast electrons. ... onuiom IWOS uMSi the Sines4 repetitvey-pulsed electin ... The advantage of this accelerator is that it ...
... propellant under high pressure and a fast-acting valve to ... or �muzzle� voltage in a pulsed electromagnetic accelerator rep- resents ...
... trum derived from the accelerator current and voltage recordings. ... In this study, the pulsed electron beam from ... The type W preamplifiers have a fast ...
... if used with the CEBAF accelerator as an IR ... Figure 7 - Pulsed Wire Setup Showing Pulsing Equipment ... fast response time and high resolution for the ...
... mode, expanding the capability of the accelerator ... production iequires a fast pulse risetime on ... after the pulsed electron beam machine's operating ...
... CYLTRAN simulation modeled for the Model 112A Pulsrad Pulsed ... ACCELERATOR TUBE e ... the Penetration and Diffusion of Fast Charged Particles ...
... twice as fast as could be accomplished by coupling to either end. ... identical accelerator cells are driven in parallel by a pulsed power drive ...
... modified betatron accelerator. ... trapping the beam has to drift fast enough during the ... a coaxial pulseline and the third on a pulsed vertical magnetic ...
... fast mode' is excited before the ring reaches the distur ... Research Laboratory modified betatron accelerator. ... the pulsed mode for y -40 and two in the ...
We report experimental investigations into a new technique for achieving temporal laser pulse shaping for RF photocathode gun applications using inexpensive UV birefringent crystals. Exploiting the group velocity mismatch between the two different polarizations of a birefringent crystal, a stack of UV pulses can be assembled into the ...
A new type of pulsed ion beam accelerator named ``bipolar pulse accelerator'' (BPA) has been proposed in order to improve the purity of intense pulsed ion beams. To confirm the principle of the BPA, we developed a bipolar pulse generator for the bipolar ...
A fast pulsed excitation, electromagnetic undulator or wiggler, employing geometrically alternating substacks of thin laminations of ferromagnetic material, together with a single turn current loop excitation of the composite assembly, of such shape and c...
The Dual-Axis Radiographic Hydrodynamics Test (DARHT) facility will employ two perpendicular electron Linear Induction Accelerators to produce intense, bremsstrahlung x-ray pulses for flash radiography. We intend to produce measurements containing three-dimensional information with sub-millimeter spatial resolution of the interior features of very dense, ...
Fast-neutron interrogation techniques are being investigated for detection of narcotics in luggage and cargo containers. This paper discusses two different fast-neutron techniques. The first uses a pulsed accelerator or sealed-tube source to produce monoe...
...the measured peak resultant acceleration shall be between 115 g and 137 g; (2) The resultant acceleration-time curve shall be unimodal to...oscillations occurring after the main acceleration pulse shall not exceed 15%...
Code of Federal Regulations, 2010
...the measured peak resultant acceleration shall be between 125 g's and 155 g's; (2) The resultant acceleration-time curve shall be unimodal...oscillations occurring after the main acceleration pulse shall not exceed...
...the measured peak resultant acceleration shall be between 120 and 150 G's. (2) The resultant acceleration-time curve shall be unimodal to...oscillations occurring after the main acceleration pulse shall not exceed 15...
A high current, high voltage, all solid-state pulse modulator has been developed for use in the Plasma Electrode Pockels Cell (PEPC) subsystem in the National Ignition Facility. The MOSFET-switched pulse generator, designed to be a more capable plug-in replacement for the thyratron-switched units currently deployed in NIF, offers unprecedented capabilities ...
... A Compact Linear Induction Accelerator System", in ... Operation of a Repetitively-Pulsed High-Current ... of the transmitter assembly, and completion ...
... BEACON TRANSPONDER: C-BAND, DOUBLE PULSED ... accelerator/beam diagnostic section, and below the ... Voltmeter Probe (HIV) assembly at ...
... 57 Pulsed Pow er for Industrial Applications ... in high-current accelerator devel- mental issues ... system lifetime, percent, with very fast response times ...
... 1 (a) - Five-foot experimental accelerator ... Injection system: Single turn external with pulsed deflection and ... 1-psec half sine wave Fast deflector and ...
... A Hewlett Packard electron beam accelerator, known as ... and tested under a pulsed power load ... The analyzer allows for fast, efficient measurements ...
... modifications to the HAWK accelerator, data acquisition ... The addition of nine pulsed magnets and ... of a differential pumping system, fast valve, and ...
... 9 The LINAC may be used to produce fast neutrons by the photofission process in a suitable target ... When testing at any pulsed accelerator, good RF ...
... fast neutron fluence of 1.8 x 1019 neutrons in ... and provide a significant pulsed neutron simulation ... caused breakdowns in the accelerator bank feed ...
... can, with only minor modifications, be used for a pulsed ... degradation of the linear accelerator over the four year ... (to act as a reflector for fast neutrons ...
... a dc beam (0 - 100pa) or a pulsed beam (0 ... silicon and GaP 8 was found to be very fast. ... the dewar can be decoupled from the accelerator drift tube ...
The stability of a thin plasma foil accelerated by the radiation pressure of a high intensity electromagnetic (e.m.) pulse is investigated analytically and with particle in cell numerical simulations. It is shown that the onset of a Rayleigh-Taylor-like instability can lead to transverse bunching of the foil and to broadening of the energy spectrum of ...
PubMed
The YALINA-Booster experiments and analyses are part of the collaboration between Argonne National Laboratory of USA and the Joint Institute for Power & Nuclear Research - SOSNY of Belarus for studying the physics of accelerator driven systems for nuclear energy applications using low enriched uranium. The YALINA-Booster subcritical assembly is ...
In this article we present the design and test results of the most powerful, fast linear transformer driver (LTD) stage developed to date. This 1-MA LTD stage consists of 40 parallel RLC (resistor R, inductor L, and capacitor C) circuits called �bricks� that are triggered simultaneously; it is able to deliver �1MA current pulse with a rise time of ...
In ITEP experimental electronuclear installation is constructed on a base of the proton linac ISTRA-36 (energy 36 MeV, pulse beam current 150 mA) and subcritical reactor assembly. Except optimization of target-blanket complex, improve-ment of the concept of common safety of the system and use of an average beam current in the range of 0.5 - 5 mA for the ...
An automated charge monitoring system for the electron beam of the NPL linear accelerator has been assembled for use primarily at the higher radiation intensities associated with industrial applications. The system is based upon the fast integration of cu...
...Stop the pendulum from the initial velocity with an acceleration vs. time pulse which meets the velocity change as specified in the following table. Integrate the pendulum acceleration data channel to obtain the velocity vs. time curve...
Fast Neutron Transmission Spectroscopy (FNTS) is being investigated for detecting explosives in luggage and other small containers. It uses an accelerator to generate nanosecond-pulsed neutron beams that strike a target, producing a white source of neutro...
A study has been done of methods of designing a very fast, high voltage pulse generator using a pulsed electron beam produced by a microchannel plate electron multiplier (MCP EM), and accelerated across a gap in a transmission line. Among the topics inves...
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 method has been developed for launching plates useful for equation of state (EOS) studies to high velocities using fast pulsed power on the Sandia National Laboratories Z Accelerator. The technique employs magnetic pressure developed in an insulating ga...
In the acceleration of polarized protons in the AGS, a number of depolarizing resonances will be encountered. Depolarization due to the so-called intrinsic resonances will be minimized by crossing each resonance in less than one beam revolution period (approx. 2 ..mu..s). This will be accomplished with a set of twelve fast tune-shifting quadrupoles ...
... Title : The Acceleration of Fast Deflagration Waves,. ... Descriptors : *Deflagration, *Ignition, Acceleration, Combustion, Reprints. ...
The research activities performed at PV A and M University in the third quarter of 1997 are summarized within. PV A and MU had performed mechanical and back pulse testing to characterize the performance of the filter and is using the process of elimination to perform the failure analysis for filters. The mechanical testing performed on the filters are categorized as follows: ...
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. Various types of loads can ...
As discussed in the last report, we are investigating the use of a neutron generator for borehole coal analyses. The neutron borehole probe uses a D-T (deuterium-tritium) accelerator tube called a Zetatron. The D-T accelerator tube emits bursts of 14 MeV neutrons due to the fusion reaction of deuterium with tritium. The Zetatron is a small D-T ...
Ion acceleration was obtained experimentally in the beat wave configuration, wave acceleration demonstrated in the converging guide geometry, and strong electric fields were obtained and measured in the waves. The simulation effort in the Cornell theory program has proceeded to the point where satisfactory wave propagation was throughout the converging ...
The drawings listed on the auxiliary drawing list provide the data and specifications for constructing the SLAC klystron pulse transformer tank assembly. The tank is used to step up the high voltage pulse produced by the modulator. It is mounted on the base of the klystron and forms an integral unit for mounting and transporting. ...
An accelerometer assembly is provided for use in activating a switch in response to multiple acceleration pulses in series. The accelerometer includes a housing forming a chamber. An inertial mass or piston is slidably disposed in the chamber and spring biased toward a first or reset position. A damping system is also provided to damp ...
Sandia National Laboratories has successfully operated fast burst reactors over the past four decades. Fast burst reactors refer to a type of reactor that is able to achieve intense neutron pulses in very short periods of time using fissile material. Typically these systems are comprised of enriched metallic uranium fuel. During ...
ENEA and ORNL have built a four barrel, two-stage pneumatic injector for the Ignitor experiment featuring two innovative concepts: (i) an optimal shaping of the propellant pressure pulse to improve pellet acceleration, and (ii) the use of fast closing (< 10 ms) valves to drastically reduce the expansion volumes of the propellant gas ...
The Sandia Pulsed Reactor Facility is specifically designed for radiation effects experiments that require an intense pulsed source of fast neutrons and gamma radiation. Designed around the Sandia Pulsed Reactor (SPR), the facility includes four buildings and an outdoor burst site. The SPR is a bare, ...
enough that fast rise time pulsed magnets are possible (see below). B. Acceleration for Higgs Collider Tb accelerator is about 10. In this example, conventional 2 T magnets are used. The effective ramp frequencies for High�Energy Physics (Stanford Linear Accelerator Center, Menlo Park, CA, ...
E-print Network
An analytical model and numerical simulations demonstrate that pulses with intensities exceeding 1022 W/cm2 may penetrate deeply into the plasma and accelerate efficiently ions in the forward direction. We propose a new scheme for fast ignition of precompressed DT fusion targets by using two laser pulses. The first ...
The fast ignitor approach to ICF ignition separates the fuel assembly and fast heating processes. After compressing the fuel with the main driver, the fuel is ignited using a focused electron or ion beam generated by a fast, ultra-high power laser pulse. This significantly relaxes the drive ...
Marx generators, a major slow-pulsed power component in Sandia Laboratories' Electron Beam Fusion Accelerator (EBFA), were assembled at a remote facility modified to utilize an assembly-line technique. Due to the size and weight of the various components, as well as the final Marx generator ...
A cargo inspection system based on pulsed fast neutron analysis (PFNA) is to be used at a border crossing to detect explosives and contraband hidden in trucks and cargo containers. Neutrons are produced by the interaction of deuterons in a deuterium target mounted on a moveable scan arm. The collimated pulsed fast ...
A possible accident in a fast reactor core when a pressure pulse (a hydrodynamic impact in a coolant) accurs as a result of heat transfer crisis in a fuel assembly (FA) is considered. The possibility of estimation of the degree of accident propagation alo...
We describe a very fast counter traveling wave kicker with a full pulse width of about 7 ns. Successful test experiment has been done with hi-tech semiconductor technology FET pulse generator with a MHz- range repetition rates and maximum kick strength of...
This document provides the radiation safety plan for the Pulsed Fast Neutron Analysis (PFNA) Cargo Inspection System facility at Ysleta Port of Entry Commercial Cargo Facility located in El Paso, Texas. It describes the PFNA facility and accelerator, disc...
A proton linac plus synchrotron system was studied for the proposed Intense Pulsed Neutron Source (IPNS) at Argonne. An Alvarez H exp - linac of 70 MeV and a high intensity fast cycling proton synchrotron to accelerate protons to 800 MeV will be the best ...
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 ...
Four accelerator parameters were found to control the condition of the electron beam entering the Intergrated Fast Reactor (IFR). These parameters were the matching of the electron beam to the ion channel, the laser timing, the benzene pressure at the entrance to the IFR, and the timing of the accelerator gaps. Manipulation of these ...
Global coronal EUV disturbances (so-called "EIT waves") are useful diagnostics for physical conditions on the Sun. Major drawbacks that hindered our understanding of this phenomenon were previous instruments' single view point, low cadence (e.g., 12 minutes of EIT), and limited wavelength coverage. The Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory ...
...measured by an accelerometer mounted on the pendulum as shown in Figure 22 of 49 CFR 572 at the instant of contact with the honey comb. (ii) Stop the pendulum from the initial velocity with an acceleration vs. time pulse which meets the velocity...
The YALINA-Booster experiments and analyses are part of the collaboration between Argonne National Laboratory of USA and the Joint Institute for Power & Nuclear Research - SOSNY of Belarus for studying the physics of accelerator driven systems for nuclear...
