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Topic: Large Helical Device

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Stellarator

Joint European Torus

ITER

Knudsen number

Controlled thermonuclear fusion

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Tokamak

Magnetohydrodynamics

Submarine

Magnetohydrodynamic drive

Magnetic reconnection

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Fluid Dynamics

	In this issue . . . (Site not responding. Last check: 2007-10-15)
		Helical devices, in which the magnetic field is independent of the plasma current, can avoid these disruptions.
		Studies of the density limit in the Large Helical Device (LHD) have focused on the asymmetric radiation observed in the final stages of the discharge [5,6] and the evolution of the collapse in comparison with discharges that are terminated at lower density when the neutral beam is turned off [7].
		The achievable density in LHD is limited by radiative collapse preceded by a thermal instability in the light impurities.
	www.ornl.gov /sci/fed/stelnews/sn90/sn90.htm (2430 words)

	Tokamak Summary
		The hydrogen bomb is a device that is ignited by the explosion of an atom (fission) bomb.
		The tokamak is characterized by azimuthal (rotational) symmetry and the use of the plasma current to generate the helical component of the magnetic field necessary for stable equilibrium.
		The tokamak continues to be the most promising device for generating net power from nuclear fusion, reflected in the design of the next generation ITER device.
	www.bookrags.com /Tokamak (0 words)

	World Nuclear Association \| Information and Issue Briefs \| Nuclear Fusion Power (Site not responding. Last check: 2007-10-15)
		In a stellarator the helical lines of force are produced by a series of coils which may themselves be helical in shape.
		RFP devices have the same toroidal and poloidal components as a tokamak, but the current flowing through the plasma is much stronger and the direction of the toroidal field within the plasma is reversed.
		RFP devices differ from tokamaks mainly in the spatial distribution of the toroidal magnetic field, which changes sign at the edge of the plasma.
	www.world-nuclear.org /info/inf66.htm (0 words)

	Old Meetings: RHT95
		As an example of an arbitrary configuration, a torus plasma in a large helical device for the research of a fusion reactor was analyzed, in which plasma is approximated as a gray participating medium and a specular and diffuse surface is assumed for the vacuum chamber.
		The figure represents the total model of the helical device comprised of 24300 elements and a part of the wall and plasma are removed to show the distributions.
		Temperature distributions of modeled plasma in large helical device used for study of fusion reactor and the wall heat flux on vacuum chamber.
	www.ichmt.org /abstracts/RHT-95/session-2.html (0 words)

	ANS : Store : Electronic Articles
		Particle control using a helical divertor configuration, to achieve improved confinement and sustainment of steady-state high-performance plasmas, is a major experimental goal in the Large Helical Device (LHD), the largest heliotron-type superconducting device, and it needs to be demonstrated on the route to the design of the heliotron-type fusion reactor.
		The LHD scrape-off layer (SOL) in the intrinsic helical divertor configuration has a unique magnetic field line structure consisting of stochastic regions, residual islands, whisker structures, and laminar layers contrasting with the "onion-skin"-like magnetic field line structure in poloidal divertor tokamak SOLs.
		Since the first experimental campaign in LHD in 1998, studies aiming at understanding the edge plasma properties in the "open" helical divertor configurations have been conducted experimentally and theoretically.
	www.ans.org /store/index.cgi?i=E100000-fst-50-3-361-371 (0 words)

	Новая страница 1 (Site not responding. Last check: 2007-10-15)
		Several new confinement scaling laws are derived using LHD database in addition to the previous medium-sized helical confinement database.
		The maximum J criterion is satisfied at the edge region in the vacuum configuration by the presence of small residual ripples and the region where the criterion is satisfied is extended to the core region due to the stellarator shear produced by the bootstrap current in a finite beta plasma.
		Helical magnetic systems with poloidal direction of the lines B = constant on the magnetic surfaces are investigated to clarify in more detail the connection between the shape of the magnetic surfaces and the topology of the B = constant surfaces on the one hand and particle confinement on the other.
	www.kinr.kiev.ua /data/digest/4_6_2001.html (0 words)

	Large Helical Device - Wikipedia, the free encyclopedia
		The Large Helical Device is a fusion research device located in Japan and is the largest superconducting stellarator in the world and employs a heliotron magnetic field originally developed in Japan.
		The objective of the project is to conduct fusion plasma confinement research in a steady-state in order to elucidate possible solutions to physics and engineering problems in helical plasma reactors.
		The LHD uses neutral beam injection, ion cyclotron radio frequency (ICRF), and electron cyclotron resonance heating (ECRH) to heat the plasma, much like conventional tokamaks.
	en.wikipedia.org /wiki/Large_Helical_Device (0 words)

	Sandia National Labs: Doing Business: Partnerships: Technology Access: User Facilities: Plasma Materials Test Facility
		Unique features of this SEM are its large vacuum chamber (~1 m dia.) and its large sample platen (25 cm x 25 cm in area).
		Because of the large heated area, it is possible to study flow instabilities in parallel channels.
		This permits ease of access by both large and small businesses throughout the country who are engaged in HHF, heat exchanger and EB-PVD research and research areas such as thermal shock and thermal fatigue of materials, modeling and process control of large-area physical vapor deposition and thermal-hydraulics.
	www.sandia.gov /bus-ops/partnerships/tech-access/facilities/pmtf.html (0 words)

	Large Helical Device Project
		Fusion research．which is an integrated-system project, has advanced step by step with larger devices that were designed and connstructed based on the previous achievements, improved plasma performance and advances in theory and engineering technique.
		One objective of the LHD project is to identify physics and engineering issues in helical type fusion reactors.
		The superconduding helical coils of LHD are presently cooled with lquid helium at 4.4K (-268.8°C).
	www.lhd.nifs.ac.jp /en/home/lhd.html (0 words)

	ICNSP98, Kageyama et al.
		The LHD (Large Helical Device) is a fusion experiment device under construction at National Institute for Fusion Science, Japan (in the real world).
		Virtual LHD program reads MHD equilibrium data calculated by the HINT code which is one of the standard codes for the MHD equilibrium of helical systems.
		As the integration goes on, the drift particle moves in the LHD and its past trajectory is shown by a line.
	www.physics.ucla.edu /icnsp/Html/kageyama/kageyama.html (0 words)

	Controlled fusion: the next step (January 2004) - Physics World - PhysicsWeb
		The Tore Supra tokamak at Cadarache in France is the largest operating superconducting device in the world, with a radius of 2.4 m and a toroidal magnetic field of 4 T. The superconducting magnets of Tore Supra, which are cooled by superfluid helium at a temperature of 1.8 K, have performed reliably for 16 years.
		The device had to be installed with a positional accuracy of about 1 mm to ensure an even distribution of the heat load.
		These devices intercept the particles coming from the region between the plasma and the walls, and then neutralize them before directing them into pumping ducts.
	physicsweb.org /articles/world/17/1/6 (0 words)

	APS - 2005 47th Annual Meeting of the Division of Plasma Physics - Event - Transport Studies of Electric Field in ... (Site not responding. Last check: 2007-10-15)
		In the compact helical system (CHS), the steep gradient of the radial electric field has been observed in the inner plasma region and the transport barrier was found in the ECRH plasma.
		The transport model for anomalous diffusivities was used to describe the turbulent plasma.
		At first, we compare the analysis results with the experimental results in LHD to discuss the validity of the physical process employed in one-dimensional theoretical study.
	meetings.aps.org /Meeting/DPP05/Event/35563 (0 words)

	Physics Today June 2002
		In quasi-symmetry, the orbiting plasma particles see the magnetic field as having a constant magnitude in some direction--the long (toroidal) or short (poloidal) way around the torus, or along a helical path, resulting in quasi-axi-, quasi-poloidal, and quasi-helical symmetry, respectively.
		And the big advance in stellarators, he adds, is the use of computers to sift through the infinity of possible three-dimensional shapes.
		First proposed in 1951 by Lyman Spitzer of Princeton University, stellarators were later largely abandoned by the US fusion community in favor of tokamaks.
	www.aip.org /pt/vol-55/iss-6/p21.html (0 words)

	Intute Science, Engineering and Technology - Full record details for Large Helical Device Project
		The Large Helical Device (LHD) project is the world's largest superconducting helical device based at the National Institute for Fusion Science (NIFS), Japan.
		The LHD produces high-performance fusion-plasmas in a controlled confinement device that employs superconducting coils, plasma heating systems and devices to measure and record plasma properties and phenomena.
		Various aspects of the LHD are explained in more depth including plasma control, plasma heating and upgrades on the superconducting helical coils.
	www.intute.ac.uk /sciences/cgi-bin/fullrecord.pl?handle=2005122-94417 (0 words)

	Magnetic Fusion
		We participate in collaborative experiments on the Joint European Torus in the United Kingdom, the JT-60 tokamak in Japan, the Large Helical Device in Japan, and the KSTAR device in Korea.
		We are developing the diagnostics to measure heat flux on a flowing liquid and the effect of extremely intense, short-duration heat pulses on a liquid surface.
		We are working with other institutions to design and construct a proof-of-principle liquid surface device that can be tested in a US fusion machine.
	www.sandia.gov /eesector/besmfe.html (0 words)

	Duk-In Choi
		They are: first, when the device becomes operational, it should be "relevant" to the world-wide fusion community.
		That is to say, the results of the experiments performed on the device, as well as its operation, should attract the interest of the scientific community world-wide and contribute to development of existing and future devices.
		Second, the construction and operation of the device should contribute to the advancement of knowledge in both Korean industry and academia.
	www.gmu.edu /departments/t-ksc/pubs/choi.htm (0 words)

	Re: What 's the principle of fusion reactor and how many type of them?
		If you design a device where magnetic field lines don't cross the walls, charged particles will follow them and will never touch the walls, avoiding the risk of damaging them.
		Such a device has a vacuum hollow doughnut shaped chamber, and magnetic field lines go around it (and particles following them).
		An inertial confinement device consists in a vacuum chamber (usually spherical in shape) where small fuel pellets are injected, as if shooted by a gun.
	www.madsci.org /posts/archives/dec2000/976034315.Ph.r.html (0 words)

	Department Overview (Site not responding. Last check: 2007-10-15)
		International resources are pooled to construct the LHC (Large Hadron Collider) to reach 14 TeV in proton-proton collisions.
		The atomic physics packages necessary for retrieving the plasma parameters from the spectroscopic data are developed in collaboration with researchers at the Lawrence Livermore National Laboratory and benchmarked on various fusion experiments in the U.S. and Europe.
		Recent international collaborations also include the development of a 2-D Far Ultraviolet imaging system for the measurement of local particle transport in the Large Helical Device, the largest fusion experiment in Japan.
	physics.jhu.edu /dept/index.html (0 words)

	INNO: NUCLEAR FUSION IN SIGHT? 2006-03-14 SOURCE: Z Machine Sets Unexpected Earth ... (Site not responding. Last check: 2007-10-15)
		Helium-4 has an anomalously large binding energy because its nucleus consists of two protons and two neutrons; so all four of its nucleons can be in the ground state.
		Consequently, even when the final energy state is lower, there is a large energy barrier that must first be overcome.
		Any given fusion device will have a maximum plasma pressure that it can sustain, and an economical device will always operate near this maximum.
	www.hi.is /~joner/eaps/inno_Nuclear_Fusion_Z_Machine.htm (0 words)

	$12.5 Million in Subcontracts Awarded for Fusion Experiment
		Record levels of fusion power have been achieved in large tokamak devices, such as the Tokamak Fusion Test Reactor, which operated at PPPL between 1983 and 1997.
		The first magnetic fusion devices explored at Princeton were stellarators, or "star generators," a term coined by Princeton Professor Lyman Spitzer, who initiated fusion research in the U.S. The NCSX will create a plasma which is more compact than traditional stellarators, including those now operational in Europe and Japan.
		The Helically Symmetric eXperiment (HSX) at the University of Wisconsin, Madison, is the only existing stellarator in the United States.
	www.physorg.com /news1483.html (0 words)

	LHD - Wikipedia, the free encyclopedia
		LHD is an acronym for the Large Helical Device
		LHD - left hand drive, a vehicular transport term
		LHD (hull classification symbol) - US Navy hull classification symbol for multipurpose amphibious assault ships of the Wasp class.
	en.wikipedia.org /wiki/LHD (0 words)

	[No title]
		Although there is no fusion reaction in the Large Helical Device (LHD), the simulation experiment can be expected by using the ion cyclotron resonance heated plasma.
		The ECH is applied in plasma sustained by NBI. With ECH, much particle with the energy of lower than 20 keV can be observed at rð=0.7. The main source of the trapped particles, which have a large pitch angle, comes from the pitch angle scattering between plasma ion and the decelerated NBI particles.
		The next issue of PCX is to minimize the effect for the measurement caused by the large variation of the plasma during pellet.
	hell.pl /ewap/O8_02_Ozaki.doc (0 words)

	CERN Courier - CERN hosts major magnet conf - IOP Publishing - article
		The gradual convergence of particle physics and astrophysics is mirrored in a move towards common technologies.
		Takashi Satow of the Japanese National Institute for Fusion Science gave a report on 18 000 h of operational experience with the institute's Large Helical Device - a fusion device built around 3-4 Tesla superconducting magnets.
		As the Large Hadron Collider is the world's largest single superconducting magnet project, CERN was a logical host for MT-17.
	www.cerncourier.com /main/article/42/2/11/1 (0 words)

	Appendix C: Hitachi Laboratory
		Its investigation of superconductors started in 1965 at the Central Research Laboratory, and in the late 1960s it constructed what was then a very large (5 MJ) magnet with Nb-Zr-Ti wire for the MITI MHD project.
		Tonomura (his work is well known), to construction of very large magnet systems, such as for the Large Helical Device at the National Institute of Fusion Science (NIFS) at Nagoya and for the International Thermonuclear Experimental Reactor (ITER).
		In support of these large construction projects at Hitachi Works, the Superconductivity Center of Hitachi Laboratory conducts relatively small-scale research and development on related subjects, and the center also conducts advanced RandD on materials such as conductor development utilizing high T
	www.wtec.org /loyola/scpa/09_05.htm (0 words)

	Plasma Dynamics Lab (Site not responding. Last check: 2007-10-15)
		Past experiments have been carried out on major confinement devices such as the Texas Experimental Tokamak at the University of Texas Austin.
		This (somewhat) portable device boasts a 47 uF, 10 kV capacitor switched with a spark-gap.
		On special occasions, the cap bank is charged up and then discharged through a three-turn coil about 3 1/2 inches in diameter.
	hibp.ecse.rpi.edu (0 words)

	Science -- Riordon 285 (5429): 822
		One is the levitated dipole reactor being developed at the Massachusetts Institute of Technology and Columbia University (see main text); here are a few of the other, less radical alternatives:
		Major stellarator experiments include Japan's Large Helical Device and the Helically Symmetric Experiment at the University of Wisconsin, Madison, as well as projects in Spain, Australia, and Germany.
		Spheromaks: Eliminating the hole in a tokamak altogether results in a spheromak, a device that, like the RFP, relies in part on plasma currents to generate confinement fields.
	www.engin.umich.edu /class/ners471/dpu/fusion-devices-science.html (0 words)

	Plasma Science and Technology - Applications - Magnetic Confinement Fusion
		Magnetic confinement fusion devices are designed to confine hot, dense plasma for a sufficient period of time (a few seconds) for nuclei to fuse by overcoming their natural repulsive forces.
		Nevertheless, basic research has enabled experiments that are 1,000,000 times better in overall performance than devices used only 20 years ago.
		Fusion is routinely produced in current experiments and we are now on the threshold of "burning plasma" experiments that will allow the construction of useful fusion powers plants.
	www.plasmas.org /fusion-mag.htm (0 words)

	Comparison of Heating Efficiency Between Co and Counter Neutral Beam injection in Large Helical Device (Site not responding. Last check: 2007-10-15)
		Exhibit Hall B, Comparison of Heating Efficiency Between Co and Counter Neutral Beam injection in Large Helical Device
		In the Large Helical Device, tangential neutral beam injection (NBI) is adopted in order to avoid that the fast ions are directly trapped in helical ripples.
		Then effective heating is realized by negative ion based high energy tangential NBI systems in Large Helical Device, two beam lines ware arranged counter -injection and the other one was arranged co-injection.
	flux.aps.org /meetings/YR01/DPP01/abs/S400060.html (0 words)

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