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Topic: Penning trap

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Abraham Darby

	Penning trap - Wikipedia, the free encyclopedia
		Penning traps are devices for the storage of charged particles using a constant magnetic field and a constant electric field.
		The invention of the Penning trap is attributed to Hans Georg Dehmelt who shared the Nobel Prize in Physics in 1989 for this work.
		Penning traps use a strong homogeneous axial magnetic field to confine particles radially and a quadrupole electric field to confine the particles axially.
	en.wikipedia.org /wiki/Penning_trap (705 words)

	Trap - Wikipedia, the free encyclopedia
		A trap is a device or tactic intended to harm, capture, detect, or inconvenience an intruder.
		Traps may be physical objects, such as cages or snares, or metaphorical concepts.
		Speed trap, a tactic designed to catch speed limit violators; it may also refer to a place where such a tactic is commonly used
	en.wikipedia.org /wiki/Trap (592 words)

	Department of Physics, IGISOL group (Site not responding. Last check: 2007-10-26)
		One application is to use the purification trap as a mass filter by fixing the frequency of the quadrupole excitation.
		As with the purification trap, first magnetron excitation is applied to increase the magnetron radius of all ions and then quadrupole excitation is used to convert magnetron motion to reduced cyclotron motion.
		When the ions are extracted from the trap, their magnetic moments interact with the magnetic field gradient and they experience an axial force converting radial kinetic energy to axial energy.
	www.phys.jyu.fi /research/igisol/trap (878 words)

	ph1121
		The actual Penning trap consists of two cap electrodes that are hyperboloids and a central ring electrode.
		A Paul trap uses the same cap and ring electrodes, but instead of using constant electric and magnetic fields as in a Penning trap, a constant electric field and an oscillating radio-frequency electric filed is used.
		Electromagnetic traps such as Penning and Paul traps are mainly used to hold sample that would react violently with the walls of a container.
	www.u.arizona.edu /~grovers/opti310/2002/wpi/EMTraps/ph1121.html (596 words)

	Modified Penning-Malmberg Trap for Storing Antiprotons
		This trap is intended for use in research on the feasibility of contemplated future matter/antimatter-annihilation systems as propulsion sources for spacecraft on long missions.
		A steady axial magnetic field that reaches a maximum at the geometric center of the tube is applied by an external source, and DC bias voltages that give rise to an electrostatic potential that reaches a minimum at the center are applied to the electrodes.
		In the modified Penning-Malmberg trap, the loss of antiprotons is reduced or eliminated by use of a "rotating-wall" RF stabilization scheme that also heats the antiproton cloud to minimize loss by matter/antimatter annihilation.
	www.nasatech.com /Briefs/Mar05/MFS31780.html (563 words)

	UW Ion trapping and cooling (Site not responding. Last check: 2007-10-26)
		Penning traps have proven invaluable in precision mass measurements and are the tools which currently give the most rigorous tests of our theory of quantum electrodynamics and fundamental symmetries.
		Optical access to a trapped ion within such a trap is difficult: small holes could be drilled in the ring or end caps to allow laser beams into the trap but the only way to get ion fluorescence out with a sufficiently large solid-angle is to construct the end caps out of a wire mesh.
		A principle use for coherent control of a trapped ion's vibrational state is entanglement with the internal degrees of freedom required by some quantum information processing schemes.
	students.washington.edu /~fatllama/bariumIonNet/ionbasics.html (2187 words)

	MYCOPLASMA
		traps are devices which use magnetic and/or electric fields to confine the ions in a small region of space to carry out a variety of studies ranging from measurement of optical spectroscopic properties of an isolated single ion to mass spectrometric studies of an ensemble of fragment ions.
		Penning traps are devices that use both magnetic field as well as electric field to trap ions.
		Ions within the cell are trapped by the magnetic field in a plane perpendicular to the magnetic field but are free to move along the direction of the magnetic field.
	www.ias.ac.in /currsci/jan25/articles25.htm (2828 words)

	Imperial College London \| Department of Physics \| Quantum Optics and Laser Science
		We were able to demonstrate sympathetic cooling of various ions including molecular ions by driving their oscillation frequencies in the trap and monitoring the effect on the magnesium fluorescence when the drive was resonant with the different ion species.
		The usual electrodes are used, and both the RF field (used in the Paul trap) and the magnetic field (as in a Penning trap) are used together.
		A variant of this type of trap with a tapered magnetic field is being employed in a novel QIP scheme which combines the benefits of trapped ion and NMR schemes.
	www.ic.ac.uk /research/qols/research_areas/ion_trap_previous.htm (1420 words)

	[No title]
		Recently, however, it has been proposed that a combined trap is in fact possible at a marginal cost of efficiency from both the charged and neutral particle trapping [1].
		The Penning trap works under the condition of a uniform magnetic field passing through the axis of an electric quadrupole.
		If electron lifetime is found to be long enough within the trap, then the Penning-Ioffe configuration could potentially be used to trap both positrons and anti-protons closely enough together in high enough density so that anti-hydrogen could be easily formed by superposition of the two stable clouds of particles and then isolated.
	www-personal.umich.edu /~povilus/penningioffe.doc (461 words)

	AMD/CPT
		The Canadian Penning Trap Mass Spectrometer (CPTMS) is currently situated at Argonne National Laboratory, Illinois, USA.
		This system was originally conceived for the precision mass measurement of "exotic" (radioactive) nuclei with half-lives greater than 50ms to a precision of 1 part per billion (ppb) of the mass.
		and the precision mass measurement Penning Trap that is situated in the magnetic field of a 5.9Tesla superconducting magnet.
	joseph_vazsg.tripod.com (189 words)

	The Annular Penning Trap
		Penning trap experiments have been unusually successful in obtaining quantitative agreement between measured and calculated transport coefficients.
		This project is aimed at understanding transport in toroidal geometry through using a Penning trap with an azimuthal field.
		The filling of the trap is stopped by removing the -150 volt bias potential from the beam-emitting filament.
	debye.colorado.edu /penning (1505 words)

	The Penning Trap (Site not responding. Last check: 2007-10-26)
		In a Penning trap charged particels (ions) can be stored with a superposition of a magnetic field and a static electric field.
		One trap is equipped with a nickel-ring, which produces an inhomogeneity in the magnetic field.
		This guaranties narrow linewidths of the Larmor- and the cyclotron-resonance.
	www.physik.uni-mainz.de /werth/g_fak/penning.htm (204 words)

	Imperial College Ion Trapping Group :: Publications
		We applied a driving voltage to the trap electrodes to drive the ions near one of their motional resonances, and studied the difference between the phase of the applied driving voltage and that of the resultant ion motion.
		A combined trap is a quadrupole trap to which the fields of both the Paul and the Penning traps are applied.
		Ion traps are well suited to this type of investigation because of the well-controlled conditions under which ions are held in traps and because they are well isolated from the environment.
	www.lsr.ph.ic.ac.uk /iontrap/publications.html (4942 words)

	Physics News Graphics: Penning Trap (Site not responding. Last check: 2007-10-26)
		See a diagram of a Penning trap, a device that uses electric and magnetic fields to trap charged particles.
		Illustration of a Penning trap, a device that uses electric and magnetic fields to trap charged particles (ions).
		In many experiments involving Penning traps, a laser beam (blue) is used to cool the ions to very low temperatures.
	www.aip.org /png/html/penning.htm (129 words)

	NSCL Science Nugget (Site not responding. Last check: 2007-10-26)
		Ca ions were then transferred to the Penning trap located in LEBIT's 9.4T superconducting magnet, where the mass of the ions was measured.
		The figure shows the time-of-flight of Ca-ions having travelled from the Penning trap to a particle detector as a function of the frequency of a radiofrequency field applied in the Penning trap.
		Ca nuclide and it is the first Penning trap mass measurement of any nucleus at a fragmentation facility.
	www.nscl.msu.edu /science/nuggets/penningTrap.html (318 words)

	Laser Spectroscopy of Highly-Charged Ions
		In the process they discovered a new perturbation of the cyclotron frequency of molecular ions due to polarizability, which can be used to accurately measure dipole moments [5].
		We then developed a technique for mass comparison with two ions simultaneously trapped in a Penning trap, but with the ions alternately cooled to the center of the trap - where the cyclotron frequency is measured - or else parked in a large radius cyclotron orbit.
		This will determine the beta-decay Q-value and hence the end-point of the tritium beta-decay electron spectrum, an important parameter in the determination of limits to the mass of the electron neutrino.
	www.physics.fsu.edu /atomic/PPTMSandSIS.htm (476 words)

	Alternate View Column AV-10
		One can then "play games" with the trapped particle, putting it through a routine of shaking and bouncing and oscillation that determines its mass, charge, spin, and internal magnetic field to almost unimaginable precision.
		A few years ago a single particle of antimatter, a positron, was successfully captured in such a trap.
		Positrons from a radioactive source were slowed and carefully manipulated until one popped into the Penning Trap.
	www.npl.washington.edu /av/altvw10.html (1710 words)

	Antimatter Space Propulsion at Penn State University (LEPS)
		The experimental results from Mark I are currently being used in the development of a NASA Penning trap that can store 10
		Due to its portability, a "radioisotope generator" antimatter trap may be transported to more remote areas for patients who cannot reach these hospitals.
		The NASA Penning trap is being designed with these medical applications in mind.
	www.engr.psu.edu /antimatter/introduction2.html (692 words)

	Welcome to Adobe GoLive 5 (Site not responding. Last check: 2007-10-26)
		The neutral anti-hydrogen produced ATHENA and ATRAP is not confined by the double-well Malmberg-Penning trap used to hold the charged anti-hydrogen constituents: positrons and anti-protons.
		Minimum-B traps have been proposed to confine the anti-hydrogen, but simple minimum B-traps are not likely to be compatible with the Malmberg-Penning traps.
		The imposition of the minimum-B magnetic fields on the Malmberg-Penning solenioidal field will change the equilibria of the charged species, and sharply increase the charged particle loss.
	www.physics.berkeley.edu /amoseminar/Abstracts/Fajans_abstract.html (157 words)

	Penning trap
		While Penning traps can only store incredibly small quantities, they will help in developing the technologies needed for advanced propulsion concepts.
		The photo on the left shows a Penning trap at the Laboratory for Energetic Particle Science at Pennsylvania State University.
		The diagram on the right is a schematic of the interior of the device.
	www.daviddarling.info /encyclopedia/P/Penning.html (165 words)

	Motivation for Particle Confinement in Penning Traps (Site not responding. Last check: 2007-10-26)
		The aforementioned attributes of the Penning trap provide ample motivation for Penning trap particle confinement.
		Secondly, the lack of a heating mechanism allows for study of a large number of interacting particles at constant energy, which in turn yields insight into behavior of one-component plasmas.
		Thirdly, one can, in the absence of micromotion, reduce kinetic energy more easily in a Penning trap than in a Paul trap.
	webphysics.davidson.edu /Projects/SuFischer/node40.html (117 words)

	phorum - Vortex - Penning Trap
		Contrary to what I stated in an earlier thread, the Penning trap for ions is not supporting the charge sheath vortex in any way.
		The ions are forced to follow a circular path through the application of an external magnetic field.
		When the external magnetic field is large and the number of ions is small this trap is effective.
	www.peter-thomson.co.uk /messageboard/vortex/Penning_Trap.htm (565 words)

	Cooler Penning Trap
		You are here: Research / atomic physics / Research / HITRAP / Cooler Penning Trap
		Electron cooling of highly charged ions (HCI) in a Penning Trap
		If you have any comments/suggestions on this page, please contact the webmaster
	www.gsi.de /forschung/ap/projects/hitrap/penning-trap_e.html (47 words)

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