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Topic: Magnetic mirror


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  Method and apparatus for removing ions trapped in a thermal barrier region in a tandem mirror fusion reactor - Patent ...
Magnetic and/or electrical field confinement configurations were found to be required to prevent loss of plasma temperature to adjacent walls of the plasma confinement chamber or cell.
The ions are caused to diffuse across the magnetic field and drift across said thermal barrier region due to a bend formed along the normal path of the reactor plasma at a point in the area between the end plug and an adjacent mirror corresponding to the thermal barrier region.
For particles in the plasma which are not trapped in the thermal barrier, but continue to be reflected by magnetic mirrors back and forth in the central cell of the fusion reactor apparatus, the plasma column in the thermal barrier regions on each end of the central cell must be bent in opposite directions.
www.freepatentsonline.com /4354998.html   (4372 words)

  
 Magnetic Mirror
The periodic magnetic structure may be turned into a diffraction grating (or a coherent beamsplitter), for example, by applying a small bias magnetic field normal to the structure surface to produce a spatial magnetic grating [1] or by applying an oscillating orthogonal magnetic field to create a temporal magnetic grating for cold atoms [3].
In order to produce a ‘hard’ magnetic mirror with short decay length or a magnetic diffraction grating for cold atoms, the periodicity of the magnetic structure needs to be very small, preferably of the order of a micron.
Magnetic force microscopy measurements indicate that the magnetic field above the periodic grooved surface decays exponentially at a rate consistent with the 1.5 mm period of the grooved structure.
www.swin.edu.au /bioscieleceng/soll/caous/magnetic_mirror.htm   (440 words)

  
 Fusion: Magnetic Confinement
Within these machines, magnetic fields are used to contain the charged particles that compose the hot plasma and keep it away from the chamber walls.
The plasma density in a magnetically confined reactor is roughly 10
Magnetic fields are much stronger than gravitational forces, so there was hope that strong fields would contain the plasma.
library.thinkquest.org /17940/texts/magnetic_confinement/magnetic_confinement.html   (761 words)

  
 Magnetic confinement fusion - Wikipedia, the free encyclopedia
Magnetic confinement fusion is an approach to fusion energy that uses magnetic fields to confine the fusion fuel in the form of a plasma.
Magnetic confinement is one of two major branches of fusion energy research, the other being inertial confinement fusion.
The simplest magnetic configuration is a solenoid, a long cylinder wound with magnetic coils producing a field with the lines of force running parallel to the axis of the cylinder.
en.wikipedia.org /wiki/Magnetic_fusion_energy   (1155 words)

  
 Magnetic Technologies L.L.C. :: Introduction   (Site not responding. Last check: 2007-10-09)
Raison d'etre behind the scenario was quite simple: since we are not familiar with the secrets of magnetic technologies and the research therein will entail a considerable amount of funds and money, it is necessary to discredit the magnetic technologies on the whole and, consequently, form customer's negative attitude and mistrust to the said technologies.
Magnetization of seeds and irrigation water has boosted the germination rate of wheat, tomatoes, peppers and cucumbers by 20, 65 and nearly 100%, respectively.
Magnetically treated irrigation water has increased the yield of wheat by 12.7-33% depending on the sowing date.
www.magneticeast.com /eng/introduction.asp   (2444 words)

  
 Magnetic Lattice
The magnetic lattices are fabricated using magnetic microstructure technology developed in-house for the grooved, perpendicularly magnetised TbGdFeCo magnetic mirror [1].
A 1D magnetic lattice may be easily constructed, for example, by using a magnetic structure similar to the perpendicularly magnetized grooved microstructure shown in Fig.1 together with an externally applied bias magnetic field.
By varying the barrier height between the magnetic microtraps and using a magnetic lattice with small period (~1 µm), it should be possible to perform quantum tunnelling experiments, including realization of the BEC superfluid - Mott insulator quantum phase transition in a magnetic lattice, as has been performed using optical lattices [3].
www.swin.edu.au /bioscieleceng/soll/caous/magnetic_lattice.htm   (369 words)

  
 Field-Reversed Magnetic Mirrors for Confinement of Plasmas
Magnetic mirrors had been investigated for potential use as plasma-confinement devices in nuclear fusion reactors, and had been largely rejected for that use because, as explained below, they allow too much plasma to escape.
The proposed FRC is intended to increase the degree of confinement achievable by a mirror magnetic field of a given flux density and/or to reduce the flux density needed to obtain a given degree of confinement.
In the baseline version, the magnetic mirror is only partially effective in that a substantial amount of plasma escapes along the magnetic field lines at the outer end.
www.nasatech.com /Briefs/Mar01/MFS31289.html   (403 words)

  
 Charged Particle Motions: Magnetic Mirroring and the Loss Cone   (Site not responding. Last check: 2007-10-09)
The equation on the previous page tells us how a particle's pitch angle increases as it moves into a region of stronger magnetic field and decreases as it moves into a region of weaker field.
In a simple magnetic mirror geometry the magnetic field reaches a minimum value at the center of the geometry and a maximum value at the end.
In a magnetic mirror geometry, particles with pitch angles in the following range are trapped within the magnetic mirror:
meted.ucar.edu /hao/aurora/txt/x_sb1_6.php   (194 words)

  
 Single Particle Motion in Electric and Magnetic Fields
Mirror reflection of a weak electron beam in a nonuniform magnetic field.
Due to the adiabatic invariants (energy and magnetic moment) the parallel energy is converted into perpendicular energy at which point the particles reflect.
Mirror reflection of a stronger electron beam in a magnetic field which converges to the right.
www.physics.ucla.edu /plasma-exp/Beam   (830 words)

  
 Magnetic mirror - Wikipedia, the free encyclopedia (via CobWeb/3.1 planetlab1.cs.columbia.edu)   (Site not responding. Last check: 2007-10-09)
For a given mirror ratio (the maximum field strength dividņşed by the minimum field strength), particles with a pitch angle (angle between the particle velocity and the magnetic field) greater than a critical value will be reflected, those with a smaller pitch angle will escape.
In the sixties and seventies, machines using magnetic mirror confinement were considered a viable candidate for producing fusion energy.
Magnetic mirrors play an important role in other types of magnetic fusion energy devices such as tokamaks, where the toroidal magnetic field is stronger on the inboard side than on the outboard side.
en.wikipedia.org.cob-web.org:8888 /wiki/Magnetic_mirror   (406 words)

  
 Magnetic mirrors
Clearly, a magnetic mirror machine is incapable of trapping charged particles which are moving parallel, or nearly parallel, to the direction of the magnetic field.
It is clear that if plasma is placed inside a magnetic mirror machine then all of the particles whose velocities lie in the loss cone promptly escape, but the remaining particles are confined.
For these reasons, magnetic mirror machines are not particularly successful plasma confinement devices, and attempts to achieve nuclear fusion using this type of device have mostly been abandoned.
farside.ph.utexas.edu /teaching/plasma/lectures/node21.html   (544 words)

  
 Magnetic Mirrors: the effects of
This section addresses the mirroring properties of a longitudinal gradient in the magnetic field; i.e., the effects of gradients in magnetic field strength parallel to
A particle reaching its magnetic mirror point is reflected and retraces its trajectory - note that Eq.
The other approach toward magnetic mirroring is to directly study the forces on a particle.
www.physics.usyd.edu.au /~cairns/teaching/lecture2/node11.html   (284 words)

  
 Method and apparatus using electron cyclotron heated plasma for vacuum pumping - Patent 4641060
A method and apparatus is disclosed for producing a gas pumping plasma within an evacuated enclosure having a collimating system consisting of baffle structures and a magnetic field having a central uniform region connected to a source of neutral gas, a magnetic mirror intermediate region and a terminating divergent region.
Within a suitable vacuum enclosure, there is established a magnetic field having three distinct regions: Region 1, a region of nearly uniform magnetic intensity; Region 2, a magnetic-mirror field with converging lines of force; and Region 3, a region in which the magnetic field lines diverge as shown.
Electrons are then heated within the magnetic mirror intermediate region to a selected level whereupon the heated electrons ionize neutral gas in the intermediate and central regions in order to create and maintain a pumping plasma in the intermediate and central regions.
www.freepatentsonline.com /4641060.html   (4715 words)

  
 [No title]   (Site not responding. Last check: 2007-10-09)
The incoming beam is split in two at the first semi-transparent mirror, and the two halves of the beam travel along separate paths around the edge of the rectangle, meeting at the opposite corner.
The divergence of the magnetic stress tensor gives that part of the force which a magnetic field exerts on a unit volume of conducting fluid due to the curvature of the magnetic field lines.
The strength of the mirror is determined by the mirror ratio.
www.faqs.org /ftp/pub/faqs/fusion-faq/glossary/m   (3047 words)

  
 Publications and Public Affairs Department   (Site not responding. Last check: 2007-10-09)
The magnetic mirror force is greater the faster the particles move around the magnetic field.
Successful integration of mirror and mirror cell is critical: If the support forces that maintain the shape of the mirror in the telescope fail, the mirror will distort and the exquisite figure polished into the mirror could be lost.
The new MMT mirror is a stiff, lightweight "honeycomb" structure of borosilicate glass cast in the Mirror Lab's large rotating furnace in 1992.
cfa-www.harvard.edu /cfa/ep/almanac/0298C.htm   (2072 words)

  
 Physics News Update Number 235 - A MAGNETIC MIRROR FOR CHILLY ATOMS   (Site not responding. Last check: 2007-10-09)
Edward Hinds (203-432-3826) and his coworkers at Yale built their mirror using a commonplace material: strips of audio tape recorded with a sinusoidally varying magnetic field pattern.
Such mirrors are needed for carrying out "atom optics," the manipulation of atoms just as light waves are manipulated by lenses and mirrors in conventional optics.
Future possibilities also include using magnetic mirrors to construct a "reflection grating" for atoms in order to study their wavelike properties.
www.aip.org /pnu/1995/split/pnu235-1.htm   (339 words)

  
 Bogdan Maglich: Migma Fusion -- Report Appendixes, Biogrpahy
The flux lines of the mirror magnetic field needed to form a migma configuration are shown in Fig.
Properties (ii) and (iv) imply that the two usual adiabatic invariants of the plasma mirror theory --- the ion magnetic moment and the longitudinal invariant --- are absent in the non-adiabatic migma orbits, New instability calculations are needed.
Since the DCX-1 magnetic field is quite similar to the migma one, although the investigations were aimed differently, negative conclusions have been drawn sometimes about the Migma project on the basis of the DCX experience.
www.rexresearch.com /maglich/migma2a.htm   (5497 words)

  
 Magnetic mirror structures observed by Cluster in the magnetosheath
Magnetic mirror structures observed by Cluster in the magnetosheath
Multiple minima in magnetic field data are no longer regarded as separate MMS but as belonging to the same mirror structure.
Because of the complexity of the model magnetic field, fitting the data from only one spacecraft has proved not to be reliable even if data from the others spacecraft can be used for checking the results.
www.agu.org /pubs/crossref/2003/2003GL017313.shtml   (234 words)

  
 A MAGNETIC MIRROR FOR CHILLY ATOMS   (Site not responding. Last check: 2007-10-09)
A MAGNETIC MIRROR FOR CHILLY ATOMS has been demonstrated, allowing researchers to manipulate cold atoms in a new way, and possibly bringing about a novel method for exploring the wavelike nature of atoms.
A supply of atoms--a rubidium-85 gas--is trapped and cooled with a combination of laser light and magnetic fields in a configuration similar to that used to create Bose-Einstein condensation (Update 233).
Unlike a previously demonstrated atom mirror (Update 149), the Yale mirror does not use laser light to reflect the atoms.
newton.ex.ac.uk /aip/glimpse.txt/physnews.235.1.html   (333 words)

  
 Introduction in the world of magnetic technologies   (Site not responding. Last check: 2007-10-09)
Mesmer magnetized almost everything: water, creams, wool, medicines, leather, clothes, wood, bread, etc.
in the water due to magnetic degassing treatment.
It is worthwhile mentioning that a recent conference of doctors and magnetologists dubbed magnetology the medicine of the 21
www.magneticeast.com /21.html   (2392 words)

  
 About Space Radiation
As these solar wind particles speed past the Earth, some of them find their way inside the Earth’s magnetopause and also become trapped by the magnetic mirror formed by the Earth’s dipole magnetic field.
The altitude of the mirror point of a particle depends upon the pitch angle of the particle’s velocity with respect to the magnetic field, and only those particles with pitch angles greater than a certain level are trapped; particles with lower pitch angles will be lost through impact with the atmosphere.
The existence of the gap between the inner and outer electron belts indicates that there are certain L-shells that do not trap significant numbers of electrons of any energy for long periods of time.
www.tethers.com /HiVOLT2.html   (573 words)

  
 No Title
The gasdynamic mirror is an axisymmetric magnetic field used to confine a fusion plasma between two magnetic mirrors.
The solver is based on an MHD Roe approximate flux function due to a symmetrizable form of the equations and combined with an additional embedded magnetic field flux to allow for improved flow solution under conditions where the magnetic energy is much greater than the kinetic energy.
In the past, magnetic mirror machines that operate in collisionless regimes have been considered as a possible containment system for terrestrial fusion power plants.
www-personal.umich.edu /~chadjo/research/mhd/gdmmodel   (973 words)

  
 Atomic acrobats bounce on magnetic mirror - 12 August 1995 - New Scientist   (Site not responding. Last check: 2007-10-09)
The device, which allows supercooled atoms to bounce on cassette tape or a floppy disc, could be used to build precision clocks and flasks for storing cold atoms.
So if a magnetic field has a sharp enough gradient in strength, it can reflect incident atoms like a mirror.
A working magnetic mirror has been slow to arrive.
www.newscientist.com /article/mg14719902.800.html   (278 words)

  
 Mirror instability at finite ion-Larmor radius wavelengths
A fully kinetic theory of the magnetic mirror instability in high-β space plasmas accounting for arbitrary ion-Larmor radius effects is developed.
It is shown that incorporation of ion-Larmor radius effects leads to a substantial modification of both the instability growth rate and the instability threshold.
Furthermore, it is shown that in the presence of finite ion-Larmor radius effects a noncoplanar component of the magnetic field perturbations appears.
www.agu.org /pubs/crossref/2004/2004JA010568.shtml   (286 words)

  
 onlinegadgetshops.co.uk - Magnetic Mirror (via CobWeb/3.1 planetlab1.cs.columbia.edu)   (Site not responding. Last check: 2007-10-09)
This Cream enamelled steel/glass mirror is another fabulous contemporary design by the chaps at Suck UK.It's supplied with 12 super strong neo magnets so you can use it to store post cards, photos and notes.
It also has a handy calendar to keep a track on the days and it has what can only be described as a handy shelf which can store everything from keys, to letters and magazines.
Quite frankly this is one of the coolest mirrors come shelving units/key holder combo's you'll ever come across.
www.onlinegadgetshops.co.uk.cob-web.org:8888 /Magnetic_Mirror.html   (96 words)

  
 LOOKALIKES: Magnetic spice racks Sunday Mirror - Find Articles
IF your kitchen cupboards are full of mismatching spice jars, it's time to streamline your storage with one of these sleek and stylish magnetic racks.
Each set comes with six individual magnetic pots, a rack to hold them, and a stand for a countertop display.
Their magnetic rack is half the price at just pounds 14 and is a real bargain.
www.findarticles.com /p/articles/mi_qn4161/is_20060423/ai_n16213284   (169 words)

  
 Promotional Inspection mirror and magnetic pointer with magnetic pick up of 1 lb. power.   (Site not responding. Last check: 2007-10-09)
Promotional Inspection mirror and magnetic pointer with magnetic pick up of 1 lb.
Alexander: Inspection mirror and magnetic pointer with magnetic pick up of 1 lb.
The Inspection mirror and magnetic pointer with magnetic pick up of 1 lb power is available with your promotional message or custom imprinted logo.
www.promopeddler.com /Detail/34040/A292   (320 words)

  
 Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
A d-c magnetic mirror machine was built and tested.
Radiofrequency enhancement was included in the design through the use of r-f plates in the vacuum chamber of the machine.
For proton beams of the order of 1 mu a, the mirror action was observed as a function of both the r-f voltage and the magnitude of the mirror field relative to the main magnetic field.
www.osti.gov /energycitations/product.biblio.jsp?osti_id=4293718   (171 words)

  
 Promotional Mirrors With A Message ™ - Magnetic mirror. Acrylic mirror business card-sized magnetic note holder.   (Site not responding. Last check: 2007-10-09)
UR line: Mirrors With A Message ™ - Magnetic mirror.
When you look into a mirror you are tattooing whatever is there onto your brain with your face attached.
The Mirrors With A Message ™ - Magnetic mirror Acrylic mirror business card-sized magnetic note holder is available with your promotional message or custom imprinted logo.
www.promopeddler.com /Detail/30005/6AM   (309 words)

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