The results of the pulse magnetic field formation of the accelerating magnetic system for the heavy ion collective accelerator prototype are presented. Magnetic field distribution in the acceleration region is measured. The relative ...
National Technical Information Service (NTIS)
... Descriptors : *ELECTRON ACCELERATORS, *BETATRONS, *PARTICLE ACCELERATORS, VELOCITY, HIGH POWER, MAGNETIC FIELDS ...
DTIC Science & Technology
... METHOD OF FORMING A VARYING MAGNETIC FIELD OF CYCLIC ACCELERATORS OF CHARGED PARTICLES (SPOSOB FORMIROVANIYA ...
... ACCELERATORS, *ION ACCELERATORS, RINGS, VACUUM APPARATUS, ELECTRONS, MAGNETIC FIELDS, CROSSED FIELD DEVICES ...
... Descriptors : *Linear accelerators, *Particle accelerators, Electric coils, Capacitors, Electric fields, Focusing, Magnetic fields, Alignment, Intensity ...
... Accession Number : AD0290837. Title : ON PLASMA ACCELERATION IN CROSSED ELECTRICAL AND MAGNETIC FIELDS. ...
... Title : Note on the Acceleration of Relativistic Electrons in the Ionosphere and the Effect of the Earth's Magnetic Field on their Trajectories. ...
... SPECTRUM ANALYZERS, MAGNETIC FIELDS, TRANSISTORS, ELECTRON ACCELERATORS, LINEAR ACCELERATORS, OPERATION, TEST ...
... Descriptors : *DIRECTED ENERGY WEAPONS, *LINEAR ACCELERATORS, MAGNETIC FIELDS, HYPERVELOCITY IMPACT, CONTROLLED ...
Superconducting accelerator magnets usually have magnetic iron yokes to obtain maximum magnetic field and to limit stray field. However, the iron is expensive and heavy. The smaller size and weight of an iron-free magnet can result in lower ...
A discussion is given of the magnetometric equipment developed for measuring pulsed magnetic fields in combined accelerating system of the heavy ion collective accelerator prototype (HICA) comprising two solenoids with the decreasing field and induction a...
The shaping of the magnetic field in the Dubna synchrocyclotron is described. The purposes of this investigation are to obtain the required radial dependence of average magnetic field decreasing in the accelerator central region, and to correct the lowest...
The effects relevant to the flow of a self-magnetically accelerated plasma jet into a convergent magnetic field are investigated. Qualitative conclusions are drawn from Ohm's law as to the electromagnetic body forces produced in the flow field. An experim...
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...
... prototype magnetic field generator was constructed with a rare earth magnet having 0.5-T surface magnetic flux ... generator. Magnetic field generator was constructed with a rare earth magnet having 0.5-T...
NBII National Biological Information Infrastructure
The results of an investigation of the structure of an ion flow at the output of an accelerator with closed electron drift and an extended zone of accelerations as a functions of the characteristic of the magnetic field in the accelerator channel are discussed. (AIP)
Energy Citations Database
The constrained or constant radius magnetic acceleration of a strong, nonneutral proton ring by a modified betatron field is considered. The modified betatron field consists of a azimuthal magnetic field B(theta) superimposed on a betatron field Bz in ...
A system for forming the leading magnetic field of the induction accelerating section of a collective accelerator prototype is considered. The system consists of magnetic field coils, positioned inside of LIU-3000 inductors, two matching solenoids situate...
... At the initial stage of the acceleration, the beam is confined inside the torus by a strong focusing torsatron magnetic field, which makes the beam ...
... diode gap by the magnetic field from the ... mechanisms are accelerated across the diode gap toward ... depend on the difference in crossing times of ...
... possibility that at high current densities an ... ACCELERATORS), SPACE CHARGE, MAGNETIC FIELDS ... EMISSION, TUNGSTEN, IONS, ION BEAMS ...
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 ...
NASA Astrophysics Data System (ADS)
... the Stanford Superconducting Linear Accelerator. ... descriptions of experimental facilities, results to ... MAGNETIC FIELDS, EXPERIMENTAL DESIGN ...
... The thermal efficiency is insensitive to magnetic field strength and specific impulse in the high range of specific impulse. ...
... Descriptors : *BETATRONS, *PARTICLE ACCELERATOR COMPONENTS, MAGNETIC FIELDS, DISPLACEMENT, TRAPPING(CHARGED ...
An impulsive plasma accelerator employing two, closely spaced, flat, spiral, coils has been used to study plasma acceleration by magnetic field annihilation. Measurements of plasma current density and electric and magnetic field were made with miniature p...
The rocket motion of macroparticles heated by energetic pulses in a spiral magnetic field was studied. The purpose of the present work is to study the ablation acceleration of a macroparticle in a spiral magnetic field with the help of the law of conserva...
... DESIGN), CYCLOTRONS, HARMONIC ANALYSIS, MAGNETIC DETECTORS, INPUT ... ELECTROMAGNETIC), HARMONIC ANALYZERS, USSR ...
The design of superconducting magnets for particles accelerators requires a high quality of the magnetic field. This paper presents an ANSYS 4.4A Post 1 macro that computes the field quality performing a Fourier analysis of the magnetic field. The ...
We have observed energetic electrons (> 400 eV) upstream of a transverse magnetic field barrier (i.e., the insulating magnetic field of an accelerating gap) in the Pulselac-C accelerator. If the barrier is not energized, the peak electron energy drops bel...
Future high-energy proton accelerators will likely require very high magnetic fields if the size of the accelerator and associated experimental areas are to be limited to dimensions that can be accomodated by the terrain at convenient sites. Two commercia...
In cyclic induction accelerators, the energy of the particles increases slowly in synchronism with the vertical (betatron) magnetic field. As a consequence of the slow acceleration, the charged particles must be confined by the weak focusing magnetic fiel...
... Title : Measurement of Ion Transverse Energy and the Electric Field in the Acceleration Gap of a Magnetically Insulated Diode. ...
Plasma current sheet permeability in coaxial accelerator determined from magnetic and electric field
NASA Technical Reports Server (NTRS)
in the presence of a magnetic field that is parallel to the acceleration. This is accomplished by analytically to the linearized equations of ideal, incompressible MHD in a noninertial reference frame that has acceleration Vt simulation linearized simulation with shock acceleration linearized ...
E-print Network
A resiliently suspended mass varies the resistance of a pair of ohmic resistors located in a magnetic field by changing position in response to acceleration. The mass may be made of soft iron or contain a magnet to affect the change in the magnetic field.
We examine the magnetic properties for the iron used in the SSC yoke laminations so that the accelerator tolerances can be met. The accelerator requirements for field quality specify a tolerance on the variation in the central field. At machine injection ...
Investigations of small plasma cluster interactions with a plasma flux in a homogeneous magnetic field showed an effective cluster acceleration by a dense magnetic flux. Linearized systems of equations indicate a rising coherent force pi-essing on the clusters. (R.V.J.)
The use of a static magnetic field with a modest intensity in the conventional vacuum laser acceleration scheme has been investigated. It has been found that the applied magnetic field can break the symmetry of the laser acceleration and deceleration phases experienced by ...
Two-dimensional particle-in-cell simulations are performed to investigate electron dynamics in antiparallel and guide field (in the presence of a strong guide field) magnetic reconnection, and the mechanisms of electron acceleration are compared. In the antiparallel reconnection, the dominant ...
Emittance growth results due to accelerating gaps, and magnetic field gaps in induction accelerators. The analytic technique previously used to study electric field induced emittance growth for immersed source beams is extended to include solenoid fringin...
Presented at the Workshop on Accelerator Magnet Superconductors (WAMS), Archamps, France, 22-24 March 2004. US LHC ACCELERATOR RESEARCH PROGRAM HIGH-FIELD MAGNET R&D James Strait Fermi National for the magnet design and for the cryogenic system. Fig. 3 Peak local power ...
An example of increased reaction velocity observed on application of an extrinsic magnetic field is reported. The reaction was the heterogeneous catalytic parahydrogen conversion which, under the conditions and as shown by the absence of measurable hydrog...
... charged particles in a toroidal vacuum chamber comprising a betatron magnetic field generator; a toroidal magnetic field generator; a generating ...
The PHERMEX accelerator is a standing wave, 50 MHz rf linear accelerator. The rf fields in three cavities are pulsed for a period of 3 ms. The experiments described are directed toward studying injection and trapping of electron rings at modes field stren...
An electromagnetic accelerator is designed for accelerating an ionized gas plasma to extremely high velocities at high flow rates. In the accelerator, a moving, preferably accelerating, magnetic field accelerates a ring-shaped plasma mass from ...
Preceded by a short discussion of the motives for using permanent magnets in accelerators, a new type of permanent magnet for use in accelerators is presented. The basic design and most important properties of a quadrupole will be described that uses both steel and permanent magnet material. ...
DOE Information Bridge
The modern charged particle accelerator has found application in a wide range of scientific research, industrial, medical, and defense fields. Researchers began to use permanent-magnet materials in particle accelerators soon after the invention of the alt...
In this paper, we first review the magnets needed in accelerators, then discuss computations for accelerator magnets performed with present codes, and finally describe a new volume integral code which shows promise, and should be suitable for parallel computation. 9 refs., 10 figs.
Initial results of an experimental investigation of the electrostatic acceleration of cesium ions in the presence of a transverse magnetic field are reported. No accelerating electrodes are employed. Their function is assumed by a magnetically confined el...
Several aspects of the application of superconductors to high field dipole magnets for particle accelerators are discussed. The attention is focused on the 10 tesla (1 m model) magnet that is envisaged for the future Large Hadron Collider (LHC) accelerato...
Proton and electron motion in a laser beat-wave accelerator with a transverse magnetic field is explored. Parameters of stable acceleration are determined analytically and by simulation. The effects of synchrotron radiation on electron acceleration are also explored.
Experiments on acceleration of nitrogen ions by electron rings in the falling-off magnetic field of a collective accelerator prototype are described. The nitrogen ions accumulated in the ring during the residual gas ionization at a chamber pressure of (2-...
have been enjoyed by people for millennia. Called the au- rora borealis or "northern lights" (fig. 1 with it the solar magnetic field. The solar wind distorts the Earth's magnetic field to create the comet are accelerated along the magnetic field toward ...
The potential drop in the polar cap region of a rotating, magnetized neutron star is found, assuming that the magnetic field is dipolar, with the field aligned (or anti-aligned) with the rotation axis. The curvature of the field lines is of critical impor...
A series of superconducting dipole magnets for the BNL Colliding Beam Accelerator which were manufactured to have the proper field quality characteristics has been tested. This report presents the analysis of the field harmonics of these magnets.
This book presents a discussion of aspects of the theory of particle transport in interplanetary space. Topics covered include solar wind, its magnetic field and structure, irregular magnetic fields, application to solar particles, shock acceleration, and modulation of galactic cosmic rays.
A well mapping apparatus comprises: a magnetic field sensing device whose output is proportional to a local magnetic field vector, an acceleration sensing device whose output is proportional to a local gravi
This paper presents preliminary results of magnetic field measurements made on a series of 50 mm aperture 15 m long SSC collider dipole magnets designed and manufactured at Fermi National Accelerator Laboratory (Fermilab) for use in the Superconducting Super Collider Laboratory (SSCL) ...
The high field superconductors which could be used in accelerator dipole magnets are surveyed, ranking these candidates with respect to ease of fabrication and cost as well as superconducting properties. Emphasis is on Nb/sub 3/Sn and NbTi. 27 refs., 2 figs. (LEW)
The main modes of operation of a collective accelerator model have been presented. The problem of decreasing the influence of the magnetic field (Tsub(imp) = 30 mu s) of the 6th stage localized outside of adgezator chamber, on the parameters of the electr...
One of the requirements of the HISTRAP RF accelerating system is that the frequency of the accelerating voltage for the cavity must keep in step with the change in the magnetic field. As the energy of the particle increases, the magnetic field is increase...
A method for correcting magnetic field aberrations produced by eddy currents induced in a particle accelerator vacuum chamber housing is provided wherein correction windings are attached to selected positions on the housing and the windings are energized ...
New regime of particle acceleration in the central region of the JINR phasotron is generated. The purpose of the investigation was to find parameters of the magnetic and accelerating fields which would increase the longitudinal and transversal stability o...
The phasotron in JINR is designed for acceleration of protons up to 680 MeV. The main peculiarity of the accelerator is the magnetic field with the space variation, ensuring the axial particle stability despite the magnetic field growing along the radius....
Four nearly identical Nb3Sn dipole models of the same design were built and tested at Fermilab. It provided a unique opportunity of systematic study the field quality effects in Nb3Sn accelerator magnets. The results of these studies are reported in the p...
... Accession Number : ADA104456. Title : Solar Flare Acceleration of Solar Wind: Influence of Active Region Magnetic Field,. ...
... operational warfare, joint planning, national and ... accelerators, Gas discharges, Magnetic fields ... Subject Categories : PLASMA PHYSICS AND ...
instability, two-streaming, Weibel instabilities) created in the shock are responsible for particle (electron, positron, and ion) acceleration. Using a 3-D relativistic ...
NASA Website
The thruster, called the Microwave Assisted Discharge Inductive Plasma. Accelerator (MAD-IPA), is shown in Fig. 1. A static magnetic field in the thruster ...
An assessment is made of the role of interstellar acceleration that would occur in the diffusion model of cosmic-ray propagation through scattering by weak irregularities in the galactic magnetic field.
electrodeless plasma propulsion for a wide variety of space applications. These ... thrusters, and helicon-electron cyclotron resonance acceleration thrusters. ... The use of an additional applied magnetic field and the use of hydrogen ...
... Descriptors : *Betatrons, *Particle accelerators, *Electron accelerators, High energy, Injection, Magnetic fields, Radius(Measure), Electron beams ...
Modern and future accelerators for high energy and nuclear physics rely increasingly on superconducting components to achieve the required magnetic fields and accelerating fields.This paper presents a practical overview of the phenomenon of superconductivity, and describes the design issues and ...
Shock Acceleration of High-Energy Cosmic Rays: The Importance of the Magnetic-Field Angle Joe-mail: giacalon@lpl.arizona.edu Abstract. The physics of particle acceleration by collisionless shocks of the accelerated particles. We show that the acceleration rate is strongly dependent on Bn and is ...
In the Collective Focusing Ion Accelerator, electrons are confined by an external magnetic field. The electrostatic field of the confined electrons form a Gabor lens which can guide and focus the ions. In a toroidal geometry, ions can be accelerated induc...
The electro-magnetic radiation of a charged particle passing through a dielectric structure has many applications to accelerator physics. Recently a new acceleration scheme, called the dielectric wake field accelerator, has been proposed. It also can be u...
... laser field, the magnetic field has to be tapered. ... electrons by a laser in free space without ... angle between the direction of electron propagation and ...
Magnetized plasma can be used as an accelerating structure capable of supporting large amplitude longitudinal fields which are externally driven by a high-frequency microwave source. Such structures can be used at very high frequencies (hundreds of gigahertz), placing them in the intermediate region between conventional (metallic) ...
Some resuls on the ion acceleration at the U-200 cyclotron from the laser source are presented. The normal to the target surface was situated at approximately 45 deg angle to the magnetic field lines. The application of this type source permitted to exten...
Understand how CMEs are heated and accelerated, and define their role in the evolution of the solar magnetic field. ... suprathermal velocity filtration ...
... BEAM STEERING, *PARTICLE BEAMS, *PARTICLE TRAJECTORIES, *PARTICLE ACCELERATORS, MAGNETIC FIELDS, EMITTANCE, PHASE ...
... response was also observed with fast motion pictures ... ence 1). The accelerator configuration employed for ... The pulsed magnetic field used for beam ...
Proton orbits are calculated in the electromagnetic vacuum field of a magnetic point dipole rotating
Observations by the instrument payload on DE-2 have been used to study the plasma and electrodynamic
ated with a relativistic electron-positron jet front propagating into an .... Nevertheless, the electron bunching seen in this case as opposed to the ...
Jan 13, 2011 ... The project seeks to explain the distribution of pulse shapes, ...... physics of relativistic particle acceleration in high magnetic fields. ...
... changes, acceleration current and magnetic fields ... facets defined by partially reflective mirrors, supplemented by ... fed back through the mirror into the ...
... Descriptors : *BETATRONS, *PARTICLE ACCELERATOR TECHNIQUES, MATHEMATICAL MODELS, CONTROL, INJECTION, MAGNETIC FIELDS ...
... Descriptors : *Electron beams, *Particle accelerators, *Betatrons, *Equations, Dynamics, Toroids, Corrections, Magnetic fields, Walls, Diffusion ...
... Exposure of these solutions to atmospheric oxygen accelerated this conversion, resulting in blue- ,. ... the angle between magnetic and electric fields. ...
... LASERS, MAGNETIC FIELDS, CURRENT DENSITY, RESONANCE, FOCUSING, ANODES, LINEAR ACCELERATORS, SOLENOIDS, DESIGN ...
The treatment of an earlier report (MURA-406) of particle orbits in FFAG accelerators with radial magnetic fields in the median plane is extended to include the effects of magnet spiraling. It is found that a twoway accelerator with a circumference factor lower than that for conventional ...
The magnetic field strength and shape for SSC superconducting magnets will determine critical properties of the accelerator systems. This paper will enumerate the relations between magnetic field properties and magnet material selection and assembly ...
In an earlier report they have reviewed four major rules to design the lattice of Fixed-Field Alternating-Gradient (FFAG) accelerators. One of these rules deals with the search of the Adjusted Field Profile, that is the field non-linear distribution along the length and the width of the ...
Jan 11, 2006 ... The particle jets (indicated by red arrows) are sandwiched between sheets of opposite magnetic fields (blue). Earth's magnetic environment ...
... INVENTIONS, MAGNETIC FIELDS, PARTICLE BEAMS, PLATES, RADIUS(MEASURE), TOROIDS, VACUUM CHAMBERS, MAGNET COILS. ...
... Pagination or Media Count : 46. ... For argon injection through the electrodes, the current was carried down-stream from the magnet in the usual self ...
This is not true if the solar magnetic field is included: the plasma pressure, ... velocity of the jet at the de Laval nozzle is accelerated to 150km/s and ...
The measurement of conductor motion, caused by exciting a superconducting dipole magnet, is compared to the measured field quality.
Discusses new ideas in the accelerator field, such as the design of linear accelerators for high energy machines; reviews sensational accelerator projects; and mentions a few applications of high energy accelerators in fields other than high energy physics. New ideas ...
Here is reported in situ observation of energetic electrons (?100-500 keV) associated with magnetic reconnection in the solar wind by the ACE and Wind spacecraft. The properties of this magnetic cloud driving reconnection and the associated energetic electron acceleration problem are discussed. Further analyses indicate that the ...
PubMed
Particle motion in a laser beat-wave plasma field with a transverse magnetic field is explored. It is determined that stable, phase-space buckets for acceleration are established by these fields and that particles injected near the beat-wave phase velocity can be trapped in these buckets and ...
Some considerations are given on the relative size of the random nonlinear field errors in the magnets of a superconducting storage accelerator and of a conventional warm accelerator. A possible correction coil is presented for the random field errors in the magnets ...
Measurements of 230 6-meter and 136 4-meter dipoles constructed for the Fermilab Main Injector were carried out as part of the magnet production effort. An automated measurement system provided data on magnetic field strength and shape using several partially redundant systems. Results of these measurements are available for each ...
The Advanced Photon Source (APS), now under construction at Argonne National Laboratory (ANL), requires dipole, quadrupole, sextupole, and corrector magnets for each of its circular accelerator systems. Three-dimensional (3-D) field computations are needed to eliminate unwanted multipole fields from the ends of ...
Emittance growth results due to accelerating gaps, and magnetic field gaps in induction accelerators. The analytic technique previously used to study electric field induced emittance growth for immersed source beams is extended to include solenoid fringing field effects in ...
Particle motion in a laser beat-wave plasma field with a transverse magnetic field is explored. It is determined that stable, phase-space buckets for acceleration are established by these fields and that particles injected near the beat-wave phase velocit...
Construction of a crossed-field apparatus for ion acceleration is described. The ions are accelerated in a direction perpendicular to the electric field so that no arc discharge is produced. Ion velocities and temperatures are given. (Gmelin Inst.)
The purpose of this grant was to develop a theoretical understanding of the processes by which open magnetic flux undergoes large-scale transport in the solar corona, and to use this understanding to develop a predictive model for the heliospheric magnetic field, the configuration for which is determined by such motions.
In the design of superconducting magnet elements, such as may be required to guide and focus ions in a particle accelerator, one frequently presumes some particular current distribution and then proceeds to compute the consequent magnetic field through us...
In the design of superconducting magnet elements, such as may be required to guide and focus ions in a particle accelerator, one frequently premises some particular current distribution and then proceeds to compute the consequent magnetic field through us...
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 ...
This research was motivated by the recent observations indicating very strong magnetic fields at some supernova remnant shocks, which suggests in-situ generation of magnetic turbulence. The dissertation presents a numerical model of collisionless shocks with strong amplification of stochastic magnetic ...
Separate abstracts were prepared for 70 papers in these workshop proceeedings. Topics covered include: superconducting accelerator magnet research and development; superconductor development; electrical measurements; magnet design and construction methods; field correction methods; power schemes and quench ...
The feasibility of using superconducting magnets in the beam interaction regions of particle accelerators is discussed. These higher field magnets can be shorter, leaving more room for detectors, but also must have a large aperture and magnetic shielding....
Design theory of hybrid (permanent magnet plus iron) accelerator magnets with application to the proposed permanent magnet recycler and stacker rings at the Fermi National Laboratory is presented. Field stability in such devices requires that changes in t...
A magnetically insulated diode employs a permanent magnet to generate a magnetic insulating field between a spaced anode and cathode in a vacuum. An ion source is provided in the vicinity of the anode and used to liberate ions for acceleration toward the ...
This paper reviews research in the United States and Japan on structural materials for high-field superconducting magnets. Superconducting magnets are used for magnetic fusion energy devices and for accelerators that are used in particle-physics research....
The authors describe the use of the CAVE virtual reality visualization environment as an aid to the design of accelerator magnets. They have modeled an elliptical multipole wiggler magnet being designed for use at the Advanced Photon Source at Argonne National Laboratory. The CAVE environment allows the authors to explore and interact ...
An important aspect of the development and production of superconducting magnets for the Colliding Beam Accelerator is the measurement of the magnetic field in the aperture of these magnets. The measurements have the three-fold purpose of determining the field quality as ...
Aurora is caused by the precipitation of energetic particles into a planetary atmosphere, the light intensity being roughly proportional to the precipitating particle energy flux. From auroral research in the terrestrial magnetosphere it is known that bright auroral displays, discrete aurora, result from an enhanced energy deposition caused by downward accelerated electrons. ...
A derivation is given of the equation for free oscillations in accelerators with an arbitrary magnetic field having a plane of symmetry. To solve the basic problems of the theory of free oscillations, which arise in the design of accelerators, an envelope method has been developed in which the study of ...
The design of the baseline accelerator system excluding the injector and extractor appears relatively straightforward. Some development is needed particularly involving the insulation system for the vertical field coil, but no major technological advancements are necessary. The resulting system requires characterization of field errors ...
The shape of TESLA accelerating structure can be improved to decrease maximal surface magnetic field by sacrificing and increasing maximal surface electric field. This sacrifice may be necessary because the magnetic field is a hard limit but electric ...
The effect of a uniform transverse magnetic field on the free convection flow of an electrically conducting fluid past an infinite vertical plate for both the classes of impulsive as well as uniformly accelerated motion of the plate is discussed. In this analysis, the magnetic lines of force are assumed to be fixed ...
Ultrahigh energy cosmic rays are likely to originate in old galaxies because of the difficulty with acceleration in special extragalactic circumstances. An extended magnetic field in the galaxy is necessary to give sufficient time dispersion from supernova events if supernova are the origin of such particles. ...
Laser-induced acceleration of an electron injected initially at an angle to the direction of a short laser pulse with frequency variation in the presence of an axial static magnetic field has been investigated. Due to the combined effect of frequency variation of the laser and a magnetic field, ...
