
	Where results make sense

Topic: Hall effect thruster

Related Topics

Ion thruster

Pulsed inductive thruster

Magnetoplasmadynamic thruster

Ion drive

Pulsed plasma thruster

Hall effect

Spacecraft propulsion

Field Emission Electric Propulsion

Lorentz force

Smart 1

Rocket propulsion

Specific impulse

Poodle thruster

Arcjet rocket

Mass driver

In the News (Sun 29 Nov 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Hall effect - Wikipedia, the free encyclopedia
		The Hall effect refers to the potential difference (Hall voltage) on opposite sides of a thin sheet of conducting or semiconducting material in the form of a 'Hall bar' or a van der Pauw element through which an electric current is flowing, created by a magnetic field applied perpendicular to the Hall element.
		Interestingly enough, the Hall effect also showed that in some substances (especially semiconductors), it is more appropriate to think of the current as positive "holes" moving rather than negative electrons.
		So called Hall effect sensors are readily available from a number of different manufacturers, and may be used in various sensors such as fluid flow sensors, power sensors, and pressure sensors.
	en.wikipedia.org /wiki/Hall_effect (1218 words)

	hall effect thruster (Site not responding. Last check: 2007-11-06)
		Hall effect thrusters, is a type of electric propulsion rocket engine in which the propellant is accelerated by an electric field in a plasma discharge with a radial magnetic field.
		The Hall thruster discharge is a DC plasma discharge.
		In a hall thruster a magnetic field is used to ensure that the discharge power goes into accelerating the xenon propellant and not the electrons, thus the thruster is efficient.
	www.yourencyclopedia.net /Hall_effect_thruster.html (988 words)

	Hall effect thruster - Wikipedia, the free encyclopedia
		A Hall effect thruster is a type of ion thruster in which the propellant is accelerated by an electric field in a plasma discharge with a radial magnetic field.
		These thrusters were introduced to the West in 1992 after a team of electric propulsion specialists, under the support of the Ballistic Missile Defense Organization, visited Soviet laboratories and experimentally evaluated the SPT-100 (i.e., a 100 mm diameter SPT thruster).
		Hall thrusters operate at a specific impulse which places it in competition with the ion thruster for uses in electric propulsion on spacecraft.
	www.wikipedia.org /wiki/Hall_effect_thruster (1060 words)

	Hall effect thruster - Open Encyclopedia (Site not responding. Last check: 2007-11-06)
		A Hall effect thruster is a type of electric propulsion rocket engine in which the propellant is accelerated by an electric field in a plasma discharge with a radial magnetic field.
		The Hall thruster was studied independently in the US and the Soviet Union in the 1950's and 60's.
		One problem with Hall thrusters is that there is a wide spread in the angle of the ions in the plume of the thruster.
	www.open-encyclopedia.com /Hall_effect_thruster (1030 words)

	Ion thruster - Wikipedia, the free encyclopedia
		In the simplest ion thruster design, an electrostatic ion thruster, the ions often hit the grids, which leads to erosion of the grids and their eventual failure.
		The Hall effect thruster is a type of ion thruster that has been used for decades for station keeping by the Soviet-Union and is now also applied in the West: the European Space Agency's satellite Smart 1 uses it.
		The HiPEP thruster differs from earlier ion thrusters because the xenon ions are produced using a combination of microwave and magnetic fields to oscillate electrons in the propellant atoms, causing the electrons to break free of the propellant atoms, leaving them as positive ions.
	www.wikipedia.org /wiki/Ion_thruster (1145 words)

	Hall effect thruster
		Hall effect thrusters, also known simply as plasma thrusters, HETs use the Hall effect to accelerate ions to produce thrust.
		A variant called stationary plasma thruster (SPT) has been used by the Russians for stationkeeping for many years and will be used on Western satellites soon.
		Example: Hall thrusters typically operate at over 50% thrust efficiency, provide specific impulse from 1200-1800 seconds, and thrust to power ratios of 50-70 mN/kW.
	www.ebroadcast.com.au /lookup/encyclopedia/ha/Hall_effect_thruster.html (130 words)

	Encyclopedia: Hall effect
		Hall conducted thermoelectric research at Harvard and where he also wrote numerous physics textbooks and laboratory manuals.
		The quantum Hall effect is a quantum-mechanical version of the Hall effect, observed in two-dimensional systems of electrons subjected to low temperatures and strong magnetic fields, in which the Hall conductance Ïƒ takes on the quantized values where e is the elementary charge and h is Plancks constant.
		2 kW Laboratory Hall Thruster in operation at the Princeton Plasma Physics Laboratory A Hall effect thruster is a type of ion thruster in which the propellant is accelerated by an electric field in a plasma discharge with a radial magnetic field.
	www.nationmaster.com /encyclopedia/Hall-effect (2234 words)

	Ion thruster - Wikipedia, the free encyclopedia
		Ion thrusters are therefore able to achieve high specific impulse, reducing the amount of reaction mass required but increasing the amount of power required compared to chemical rockets.
		Ion thrusters can deliver one order of magnitude greater fuel efficiency than traditional liquid fuel rocket engines, but are generally constrained to very low thrusts by the available power.
		Ion thrusters have to be kept running a large part of the time to allow the milligee acceleration to build up into something meaningful.
	en.wikipedia.org /wiki/Ion_thruster (1145 words)

	Hall effect thruster
		The axial electric field developed between the electrodes interacts with the radial magnetic field to produce, by the so-called Hall effect, a current in the azimuthal direction.
		This current, in turn, reacts against the magnetic field to generate a force on the propellant in the downstream axial direction.
		Although conceived in the United States, the Hall thruster was developed into an efficient propulsion device — the SPT (stationary plasma thruster) — in the Soviet Union.
	www.daviddarling.info /encyclopedia/H/Halleffectthruster.html (227 words)

	Tecplot Case Study - CCSE Berkeley Lab
		Tecplot is used to animate simulated transit-time oscillations inside the discharge channel of a Hall Effect thruster onboard an Air Force satellite.
		A Hall Effect thruster is an electric rocket engine which accelerates ions in crossed electric and magnetic fields in a quasi-neutral plasma.
		Hall Effect satellite thruster performance is important to the reduction of the overall size and electrical power needs of an orbiting spacecraft or satellite.
	www.tecplot.com /showcase/studies/2004/air_force.htm (816 words)

	[No title]
		The Hall thruster is an electric rocket engine, which accelerats ions in crossed electric and magnetic fields in a quasineutral plasma.
		The effect of segmented electrodes and their materials on ionization and acceleration processes in the laboratory Hall thruster at different power levels.
		The use of emissive spectroscopy for measurements of plasma properties inside and outside the thruster and for indirect characterization of the beam divergence inside the thruster channel.
	w3.pppl.gov /~fisch/proj_hallthruster.html (495 words)

	Electric Propulsion Systems (Site not responding. Last check: 2007-11-06)
		This thruster uses a Xenon plasma discharge from which an ion beam is extracted using grid-plates perforated with holes.
		In MPD thrusters a current along a conducting bar creates an azimuthal magnetic field that interacts with the current of an arc that runs from the point of the bar to a conducting wall.
		The principle of the helicon thruster is similar to the pulsed-plasma thruster: a travelling electromagnetic wave interacts with a current sheet to maintan a high JxB force on a plasma moving along an axis.
	www.ttauv.freeserve.co.uk /9000electric.html (1394 words)

	1000 Hours of Testing Completed on 10-kW Hall Thruster (Site not responding. Last check: 2007-11-06)
		Hall effect thrusters are propulsion devices that electrostatically accelerate xenon ions to produce thrust.
		Hall effect propulsion has been in development for many years, and low-power devices (1.35 kW) have been used in space for satellite orbit maintenance.
		This test is the longest operation ever achieved on a high-power Hall thruster (greater than 4.5 kW) and is a key milestone leading to the use of this technology for future NASA, commercial, and military missions.
	www.lerc.nasa.gov /WWW/RT2000/5000/5430mason.html (413 words)

	Hall effect thruster -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-11-06)
		A Hall effect thruster is a type of electric propulsion (A jet engine containing its own propellant and driven by reaction propulsion) rocket engine in which the (Something that propels) propellant is accelerated by an electric field in a plasma discharge with a radial magnetic field.
		Thus it is a type of (Click link for more info and facts about ion thruster) ion thruster.
		A Hall thruster typically operates at around 50–60% (Verbal criticism) thrust efficiency and provides (Click link for more info and facts about specific impulse) specific impulse from 1,200 to 1,800 lbf·s/lb (12 to 18 kN·s/kg), and thrust-to-power ratios of 50–70 mN/kW.
	www.absoluteastronomy.com /encyclopedia/H/Ha/Hall_effect_thruster.htm (1198 words)

	ESA Science & Technology: No. 2 - Early Ion Drive Performance
		The thruster performance and discharge stability are very good and confirmed by the measurements of total spacecraft acceleration over an orbit.
		This sequence was interrupted by discharge flame out after the thruster had remained in a high oscillation mode.
		After a complete electrical check of the system, the thruster was fired successfully on the primary cathode for 2.5 hours.
	sci.esa.int /science-e/www/object/index.cfm?fobjectid=33973 (327 words)

	Improved Ignitor and Keeper Power Supplies for Hall Thruster
		Prior to the development of these power supplies, difficulties had been observed in the operation of cold-cathode Hall thrusters; in particular, they did not start reliably upon turn-on of power.
		Many specialists in Hall thrusters had attributed the difficulties to the characteristics of cold cathodes as distinguished from those of hot cathodes.
		The development of the present ignitor and keeper power supplies was guided by the observation that the key to reliable operation of cold-cathode Hall thrusters is to use correct power-supply waveforms and that the unreliability of startup observed previously was caused by the use of incorrect waveforms.
	www.nasatech.com /Briefs/Nov00/LEW16490.html (276 words)

	Pratt & Whitney - Products - Electric Propulsion (Site not responding. Last check: 2007-11-06)
		The T-40 Hall Effect Thruster is an ideal size for orbit adjustment for small satellites and east-west station keeping for large satellite systems.
		The largest Hall Effect Thruster in the family is the T-220.
		The T-220 thrusters operate at 7 to 20 kW and produce 0.5 to 1.0 N of thrust with specific impulse values varying between 1,500 and 2,500 seconds, depending on operational conditions.
	www.pratt-whitney.com /prod_space_eprop.asp (466 words)

	Thruster (Site not responding. Last check: 2007-11-06)
		Fisch also leads the Thruster Laboratory Division at the PPPL, which studies the use of plasma to propel satellites and generate thrust.
		He was doing this with twins and pumping a thruster but it was a narrow slip and he wasn't able to hold the stern straight-to long enough to make the final...
		A thruster is a small propulsive device used by spacecraft for station keeping, attitude control, or long duration low thrust acceleration.
	thruster.wikiverse.org (166 words)

	electron bombardment thruster
		Also known as the electrostatic ion thruster, one of the most promising forms of electric space propulsion and one of only two forms of ion propulsion currently employed aboard spacecraft; the other is the Hall effect thruster.
		A hot, hollow cathode (negative electrode) at the center of the chamber emits electrons, which are attracted to a cylindrical anode (positive electrode) around the walls of the chamber.
		The two most significant operational forms of electron bombardment thruster are the NSTAR, developed by NASA, and used aboard Deep Space 1, and XIPS (xenon-ion propulsion system), developed by Hughes (now part of Boeing), and used for station-keeping on some geosynchronous satellites.
	www.daviddarling.info /encyclopedia/E/electronbomthruster.html (468 words)

	Hall effect thruster - Encyclopedia, History, Geography and Biography
		Scaling the typically 1 kW Hall thruster to higher powers (50 to 100 kW) and lower powers (50 to 100 W)
		Hall Effect Sensors and Stuff (Find Lots of Other Stuff Too) (http://www.amasci.com/maglev/hall.html)
		Hall effect thruster, See also and External links.
	www.arikah.net /encyclopedia/Hall_effect_thruster (1093 words)

	3C: Plasma Thrusters
		Nevertheless, the experiences of the NSTAR ground tests and the thruster on the Deep Space One spacecraft indicate that the discharge cathode wear must be studied experimentally and theoretically to ensure that it meets the lifetime requirements.
		We also anticipate strong resonance effects for the cases when plasma Debye length is close to the electron gyroradius in the internal magnetic field of a Hall thruster.
		A limit on the efficiency of the MPD thruster in a non-diverging geometry is derived.
	www.ee.ualberta.ca /icops2002/programtest/3C.htm (1445 words)

	4.5-kW Hall Effect Thruster Evaluated (Site not responding. Last check: 2007-11-06)
		As part of an Interagency Agreement with the Air Force Research Lab (AFRL), a space simulation test of a Russian SPT–140 Hall Effect Thruster was completed in September 1999 at Vacuum Facility 6 at the NASA Glenn Research Center at Lewis Field.
		The thruster, shown in the photo, was subjected to a three-part test sequence that included thrust and performance characterization, electromagnetic interference, and plume contamination.
		The Glenn testing provided a critical contribution to the thruster development effort, and the large volume and high pumping speed of this vacuum facility was key to the test’s success.
	www.lerc.nasa.gov /WWW/RT1999/5000/5430mason.html (379 words)

	Ion Thruster (Site not responding. Last check: 2007-11-06)
		An ion thruster is a type of spacecraft propulsion that uses beams of ions for propulsion.
		The acceleration received from the thruster is a very efficient form of propulsion, using very little reaction mass.
		Ion thrusters can deliver performance approximately one order of magnitude greater than traditional liquid fuel rocket engines in terms of fuel efficiency.
	www.wikiverse.org /ion-thruster (636 words)

	Ion thruster (Site not responding. Last check: 2007-11-06)
		An ion thruster is a type of spacecraft propulsion that uses beams of ions for Ions are accelerated by passing them through grids (similar in concept to a vacuum tube).
		Ion thrusters can deliver performance approximately order of magnitude greater than traditional liquid fuel rocket in terms of fuel efficiency.
		Extended-testing of Xenon ion thruster hollow cathodes (SuDoc NAS 1.26:189227)
	www.freeglossary.com /Ion_Engine (604 words)

	Lecture #31: Plasma and electric propulsion
		The Russian SPT thruster, shown at right, is presently the most common example of a Hall-effect thruster.
		The principle of the helicon thruster is similar to the pulsed-plasma thruster: a traveling electromagnetic wave interacts with a current sheet to maintain a high
		NASA workshops on specific types of thrusters are held with fair regularity, and advanced-propulsion systems are often discussed in conferences devoted to long-range missions.
	fti.neep.wisc.edu /~jfs/neep533.lect31.99/plasmaProp.html (1522 words)

	Integrated Stirling Convertor and Hall Thruster Test
		The Stirling electrical controller interfaced directly with the Hall thruster power-processing unit, both of which were located outside of the vacuum chamber.
		At the time of the demonstration, the Stirling convertor was operating at a hot temperature of 530 °C and a cold temperature of -6 °C. The linear alternator was producing approximately 250 W at 109 Vac, while the power-processing unit was drawing 175 W at 48 Vdc.
		The majority of power was delivered to the Hall thruster discharge circuit operating at 115 Vdc and 0.9 A.
	www.lerc.nasa.gov /WWW/RT2001/5000/5490mason.html (355 words)

Try your search on: Qwika (all wikis)