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Reversed field pinch - Video Learning - WizScience.com
Reversed field pinch - Video Learning - WizScience.com
Published: 2015/09/10
Channel: Wiz Science™
Hover Reverse Pinch
Hover Reverse Pinch
Published: 2017/06/09
Channel: Mango
NB tracer simulation in Reverse Field Configuration
NB tracer simulation in Reverse Field Configuration
Published: 2010/10/15
Channel: charlsonification
reverse pinch for pensionart
reverse pinch for pensionart
Published: 2016/01/24
Channel: David Teiler
Pinch (plasma physics) - Video Learning - WizScience.com
Pinch (plasma physics) - Video Learning - WizScience.com
Published: 2015/09/08
Channel: Wiz Science™
Field Reversed Configurations (FRC) Formation Process
Field Reversed Configurations (FRC) Formation Process
Published: 2015/10/23
Channel: TAE Technologies
Magnetic mirror / pinch SAM 2970
Magnetic mirror / pinch SAM 2970
Published: 2014/12/06
Channel: Andrew Seltzman
Reverse pinch to end the rally
Reverse pinch to end the rally
Published: 2017/03/19
Channel: Mike King
PBS Kids Dash Logo Pinch
PBS Kids Dash Logo Pinch
Published: 2017/07/23
Channel: Pambour And Nubia Bonsu teh object thingy
PBS Kids Dot Logo in Ear Bleeping
PBS Kids Dot Logo in Ear Bleeping
Published: 2017/03/26
Channel: Владимир прутиков
Fusion-Enabled Pluto Orbiter and Lander - Princeton Satellite Systems, Inc.
Fusion-Enabled Pluto Orbiter and Lander - Princeton Satellite Systems, Inc.
Published: 2016/08/25
Channel: sietuuba
Z-pinch - Video Learning - WizScience.com
Z-pinch - Video Learning - WizScience.com
Published: 2015/09/10
Channel: Wiz Science™
Aphex Twin - Goon Gumpas (X10 Slower)
Aphex Twin - Goon Gumpas (X10 Slower)
Published: 2011/02/26
Channel: Rushnerd
SEM fusor with reversed polarities and magnetic mirror
SEM fusor with reversed polarities and magnetic mirror
Published: 2017/07/18
Channel: Rinze Joustra
Ultra Fast Framing Plasma Imaging
Ultra Fast Framing Plasma Imaging
Published: 2016/07/05
Channel: Kirana Camera
PH EM MI PODS 70033A V0241 Pinch Effect Interaction between Current Carrying Wires
PH EM MI PODS 70033A V0241 Pinch Effect Interaction between Current Carrying Wires
Published: 2013/02/16
Channel: UniServeScienceVIDEO
pinch effect
pinch effect
Published: 2011/01/26
Channel: Plasmageeks
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Published: 2014/12/23
Channel: Jared Sparks
Pinch effect Meaning
Pinch effect Meaning
Published: 2015/04/25
Channel: ADictionary
Rocket League - Sick reversed power shot (hit the post)
Rocket League - Sick reversed power shot (hit the post)
Published: 2017/01/29
Channel: Antoine Cloutier
Medical vocabulary: What does Reversal Learning mean
Medical vocabulary: What does Reversal Learning mean
Published: 2016/01/18
Channel: botcaster inc. bot
use different angle toroidal magnetic field coils unlimited
use different angle toroidal magnetic field coils unlimited
Published: 2016/03/21
Channel: ประภาส ผลสว่าง
Fusion   Magnetic Confinement   Home Energy Reactor
Fusion Magnetic Confinement Home Energy Reactor
Published: 2017/04/20
Channel: Nicholas T
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What Is The Dynamo Effect?
Published: 2017/12/19
Channel: Raguel Oliveira Tipz
Nuclear Fusion: Clean Power for the Next Hundred Centuries
Nuclear Fusion: Clean Power for the Next Hundred Centuries
Published: 2009/09/10
Channel: GoogleTechTalks
MLB: Blown Calls
MLB: Blown Calls
Published: 2015/07/28
Channel: BronxBomber42
Irvine Field Reversed Configuration  Ion Density and Flow
Irvine Field Reversed Configuration Ion Density and Flow
Published: 2016/05/16
Channel: slide show me
Pinch Effect
Pinch Effect
Published: 2011/08/02
Channel: Plasmageeks
GKL┇UPDATED STX Duel Faceoff Pattern
GKL┇UPDATED STX Duel Faceoff Pattern
Published: 2017/11/11
Channel: Green Knuckles Lacrosse
19.0 Firefly: An Unmanned Interstellar Probe Using Z-Pinch Propulsion
19.0 Firefly: An Unmanned Interstellar Probe Using Z-Pinch Propulsion
Published: 2014/12/22
Channel: TVIW2014
MIL@PHI: Nelson balks, Hernandez trots across plate
MIL@PHI: Nelson balks, Hernandez trots across plate
Published: 2015/06/30
Channel: MLB
Tri Alpha Energy reportedly makes important breakthrough in developing fusion reactor
Tri Alpha Energy reportedly makes important breakthrough in developing fusion reactor
Published: 2015/08/27
Channel: Star News
Inertial migration in a micro-channel
Inertial migration in a micro-channel
Published: 2014/08/03
Channel: Hamed Haddadi
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idea machine control plasma for fusion
Published: 2015/10/22
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CosmicResonanceContemplation
Published: 2011/04/26
Channel: Shelli Joye
How MOSFETs and Field-Effect Transistors Work!
How MOSFETs and Field-Effect Transistors Work!
Published: 2013/06/22
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Lecture 4 - Magnetic mirror, magnetic moment, loss cone
Lecture 4 - Magnetic mirror, magnetic moment, loss cone
Published: 2017/05/02
Channel: USYD - Senior Plasma Physics Lectures
TEX@NYM: Flores hits solo homer after call overturned
TEX@NYM: Flores hits solo homer after call overturned
Published: 2017/08/09
Channel: MLB
The Solar Dynamo: Toroidal and Poloidal Magnetic Fields
The Solar Dynamo: Toroidal and Poloidal Magnetic Fields
Published: 2010/01/25
Channel: SDO | Solar Dynamics Observatory
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Pujols flips to no one, Villar takes second
Published: 2014/04/06
Channel: MLB
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TOKAMAKS BANGLED
Published: 2014/07/23
Channel: Blake Taylor
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The FET (field effect transistor)
Published: 2013/03/30
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Has a secretive California firm worked out how to harness fusion power?
Published: 2015/08/28
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Easy Reverse Applique: Quilt Tutorial with Rob Appell of Man Sewing
Easy Reverse Applique: Quilt Tutorial with Rob Appell of Man Sewing
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Manny leads Red Sox with American flag in 2004
Manny leads Red Sox with American flag in 2004
Published: 2016/12/08
Channel: MLB
The N-Channel Mosfet Transistor (NMOS)
The N-Channel Mosfet Transistor (NMOS)
Published: 2012/06/01
Channel: booksofscience
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Working of MOSFET transistor
Published: 2012/08/25
Channel: Electronics and Communication Engineering Department, Kalasalingam University
7b The stellarator and other confinement concepts
7b The stellarator and other confinement concepts
Published: 2015/09/15
Channel: Plasma Physics and Applications
Bumgarner
Bumgarner's incredible 'disappearing pitches'
Published: 2014/10/02
Channel: MLB
Problem on Zener diode voltage regulator - GATE 2013 Solved Paper (Electron Devices) (www.egate.ws)
Problem on Zener diode voltage regulator - GATE 2013 Solved Paper (Electron Devices) (www.egate.ws)
Published: 2013/07/27
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WIKIPEDIA ARTICLE

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The poloidal field in a reverse field pinch

A reversed-field pinch (RFP) is a device used to produce and contain near-thermonuclear plasmas. It is a toroidal pinch which uses a unique magnetic field configuration as a scheme to magnetically confine a plasma, primarily to study magnetic fusion energy. Its magnetic geometry is somewhat different from that of the more common tokamak. As one moves out radially, the portion of the magnetic field pointing toroidally (see inset) reverses its direction, giving rise to the term "reversed field". This configuration can be sustained with comparatively lower fields than that of a tokamak of similar power density. One of the disadvantages of this configuration is that it tends to be more susceptible to non-linear effects and turbulence. This makes it a perfect laboratory for non-ideal (resistive) magnetohydrodynamics. RFPs are also used in the study of astrophysical plasmas as they share many features.

The largest Reversed Field Pinch device presently in operation is the RFX (R/a = 2/0.46) in Padua, Italy. Others include the MST (R/a = 1.5/0.5) in the United States, EXTRAP T2R (R/a = 1.24/0.18) in Sweden, TPE-RX (R = 0.51/0.25) in Japan, and KTX (R/a = 1.4/0.4) in China.

Characteristics[edit]

Unlike the Tokamak, which has a much larger magnetic field in the toroidal direction than the poloidal direction, an RFP has a comparable field strength in both directions (though the sign of the toroidal field reverses). Moreover, a typical RFP has a field strength approximately one half to one tenth that of a comparable Tokamak. The RFP also relies on driving current in the plasma to reinforce the field from the magnets through the dynamo effect.

Magnetic topology[edit]

The reversed-field pinch works towards a state of minimum energy.

The magnetic field lines coil loosely around a center torus. They coil outwards. Near the plasma edge, the toroidal magnetic field reverses and the field lines coil in the reverse direction.

Internal fields are bigger than the fields at the magnets.

RFP in Fusion Research: comparison with other confinement configurations[edit]

The RFP has many features which make it a promising configuration for a potential fusion reactor.

Advantages[edit]

Due to the lower overall fields, an RFP reactor might not need superconducting magnets. This is a large advantage over tokamaks since superconducting magnets are delicate and expensive and so must be shielded from the Neutron rich fusion environment. RFPs are susceptible to surface instabilities and so require a close fitting shell. Some experiments (such as the Madison Symmetric Torus) use their close fitting shell as a magnetic coil by driving current through the shell itself. This is attractive from a reactor standpoint since a solid copper shell (for example) would be fairly robust against high energy neutrons, compared with superconducting magnets. There is also no established beta limit for RFPs. There exists a possibility that a reversed field pinch could achieve ignition solely with ohmic power (by driving current through the plasma and generating heat from electrical resistance, rather than through electron cyclotron resonance heating), which would be much simpler than tokamak designs, though it could not be operated in steady state.

Disadvantages[edit]

Typically RFPs require a large amount of current to be driven, and although promising experiments are underway, there is no established method of replacing ohmically driven current, which is fundamentally limited by the machine parameters. RFPs are also prone to tearing modes which lead to overlapping magnetic islands and therefore rapid transport from the core of the plasma to the edge. These problems are areas of active research in the RFP community.

The plasma confinement in the best RFP's is only about 1% as good as in the best tokamaks. One reason for this is that all existing RFP's are relatively small. MST was larger than any previous RFP device, and thus it tested this important size issue.[1]. The RFP is believed to require a shell with high electrical conductivity very close to the boundary of the plasma. This requirement is an unfortunate complication in a reactor. The Madison Symmetric Torus was designed to test this assumption and to learn how good the conductor must be and how close to the plasma it must be placed. In RFX, the thick shell was replaced with an active system of 192 coils, which cover the entire torus with their saddle shape, and response to the magnetic push of the plasma. Active control of plasma modes is also possible with this system.

Plasma Physics Research[edit]

The Reversed Field Pinch is also interesting from a physics standpoint. RFP dynamics are highly turbulent. RFPs also exhibit a strong plasma dynamo, similar to many astrophysical bodies. Basic plasma science is another important aspect of Reversed Field Pinch research.

External links[edit]

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