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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 Radiant
wild reverse pinch
wild reverse pinch
Published: 2017/09/29
Channel: Rocket League Revolution
NB tracer simulation in Reverse Field Configuration
NB tracer simulation in Reverse Field Configuration
Published: 2010/10/15
Channel: charlsonification
Pinch (plasma physics) - Video Learning - WizScience.com
Pinch (plasma physics) - Video Learning - WizScience.com
Published: 2015/09/08
Channel: Wiz Science™
Reverse pinch to end the rally
Reverse pinch to end the rally
Published: 2017/03/19
Channel: Mike King
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
Trippie Redd "Romeo & Juliet" (WSHH Exclusive - Official Music Video)
Trippie Redd "Romeo & Juliet" (WSHH Exclusive - Official Music Video)
Published: 2017/06/12
Channel: WORLDSTARHIPHOP
Bumgarner
Bumgarner's incredible 'disappearing pitches'
Published: 2014/10/02
Channel: MLB
Z-pinch - Video Learning - WizScience.com
Z-pinch - Video Learning - WizScience.com
Published: 2015/09/10
Channel: Wiz Science™
Klasky Csupo in Reversed Loud
Klasky Csupo in Reversed Loud
Published: 2017/04/15
Channel: Jayden Galipo
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
Pinch Effect
Pinch Effect
Published: 2011/08/02
Channel: Plasmageeks
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
MLB: Blown Calls
MLB: Blown Calls
Published: 2015/07/28
Channel: BronxBomber42
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I know he didn't return it but that was really goo
Published: 2014/12/23
Channel: Jared Sparks
SEM fusor with reversed polarities and magnetic mirror
SEM fusor with reversed polarities and magnetic mirror
Published: 2017/07/18
Channel: Rinze Joustra
DeepZoom in ion
DeepZoom in ion
Published: 2014/02/11
Channel: Koushik Dutta
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 Meaning
Pinch effect Meaning
Published: 2015/04/25
Channel: ADictionary
PBS Kids Dash Logo Pinch
PBS Kids Dash Logo Pinch
Published: 2017/07/23
Channel: Pambour And Nubia Bonsu teh object thingy
How MOSFETs and Field-Effect Transistors Work!
How MOSFETs and Field-Effect Transistors Work!
Published: 2013/06/22
Channel: Thomas Schwenke
Tips to get Pressure Off Nerve While Sleeping with Low Back Pain and Sciatica / Dr Mandell
Tips to get Pressure Off Nerve While Sleeping with Low Back Pain and Sciatica / Dr Mandell
Published: 2015/04/30
Channel: motivationaldoc
Lussuria - Boneblack
Lussuria - Boneblack
Published: 2014/08/15
Channel: Voneuen
Pujols flips to no one, Villar takes second
Pujols flips to no one, Villar takes second
Published: 2014/04/06
Channel: MLB
Flow Z-Pinch
Flow Z-Pinch
Published: 2015/07/26
Channel: Signal Deluxe - Topic
SEA@SD: Medica singles to center to score Cabrera
SEA@SD: Medica singles to center to score Cabrera
Published: 2014/06/19
Channel: MLB
TOKAMAKS BANGLED
TOKAMAKS BANGLED
Published: 2014/07/23
Channel: Blake Taylor
The N-Channel Mosfet Transistor (NMOS)
The N-Channel Mosfet Transistor (NMOS)
Published: 2012/06/01
Channel: booksofscience
Energetic PIC response to (1,1) mode betafrac=.25
Energetic PIC response to (1,1) mode betafrac=.25
Published: 2011/09/02
Channel: charlsonification
Dash and dot episode 6 mixed up logos
Dash and dot episode 6 mixed up logos
Published: 2017/07/02
Channel: pbs Kids Picsures
Hope College Physics: Lab 2.4 Magnetic Feild and Ampere
Hope College Physics: Lab 2.4 Magnetic Feild and Ampere's Law
Published: 2013/03/11
Channel: Andrew Bunnell
Excellent Quality - Vanquest FTIM SLIM Maximizer - Review
Excellent Quality - Vanquest FTIM SLIM Maximizer - Review
Published: 2017/03/06
Channel: TheOutdoorGearReview
Do You Know Yourself? - Mind Field (Ep 8)
Do You Know Yourself? - Mind Field (Ep 8)
Published: 2017/03/01
Channel: Vsauce
Shin Megami Tensei: Devil Survivor OST - Pinch Battle
Shin Megami Tensei: Devil Survivor OST - Pinch Battle
Published: 2013/08/10
Channel: gamemusicSTAR
Homopolar Motor Insane Discovery
Homopolar Motor Insane Discovery
Published: 2016/11/12
Channel: Magnetic Games
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Channel: guitarstudionarodru
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Channel: Audiopedia
Easy Reverse Applique: Quilt Tutorial with Rob Appell of Man Sewing
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Numerical Simulation and Optimal Control in Plasma Physics With Applications to Tokamaks Modern Appl
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Published: 2016/03/27
Channel: Claude Morrison
Aphex Twin - Goon Gumpas (X10 Slower)
Aphex Twin - Goon Gumpas (X10 Slower)
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Channel: Rushnerd
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Published: 2012/08/25
Channel: Electronics and Communication Engineering Department, Kalasalingam University
Unfinished Business | Critical Role RPG Episode 100
Unfinished Business | Critical Role RPG Episode 100
Published: 2017/07/12
Channel: Geek & Sundry
Logo Effect attempt (maya)
Logo Effect attempt (maya)
Published: 2014/11/22
Channel: ja son
STL@CIN: Heisey reaches safely on Jay
STL@CIN: Heisey reaches safely on Jay's error
Published: 2014/04/05
Channel: MLB
SD@COL: Wolters plates Parra with a single to center
SD@COL: Wolters plates Parra with a single to center
Published: 2016/09/19
Channel: MLB
s1-geometry-problems-solutions 幾何問題(答案)
s1-geometry-problems-solutions 幾何問題(答案)
Published: 2012/06/09
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Pat Murphy- Baseball Video
Pat Murphy- Baseball Video
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Could a Micro Neck Lift Be Right for You?
Could a Micro Neck Lift Be Right for You?
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Channel: The Doctors
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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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