A hexapole magnetic guide for neutral atomic beams

Beardmore, JP; Palmer, Adam James; Kuiper, Koenraad; Sang, R. T.

doi:10.1063/1.3176470

Cited by 17 publications

(14 citation statements)

References 24 publications

(24 reference statements)

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“…The proposed guide configurations could also be used for the magnetic velocity selection of effusive or supersonic beams, similar to bent magnetic guides developed previously [21,24,25]. Such a bent guide would form the magnetic counterpart to the electric velocity filter developed by the Rempe group [52], i.e., it would reject all but the slowest paramagnetic particles from a given velocity distribution.…”

Section: Other Applicationsmentioning

confidence: 95%

“…in a hexapole configuration, provide large magnetic field gradients but the magnetic field is not tunable. There have been various approaches to achieve magnetic guiding, either using wire geometries [4,[15][16][17][18][19][20] or permanent-magnet assemblies [21][22][23][24][25][26]. However, these designs did not aim at a variation of the maximum guidable velocity which is required for the use of Zeeman-decelerated supersonic beams (typical velocities between 100-500 m/s in the case of H atoms [13,14]) in collision-energy-dependent reaction studies in ion traps.…”

Section: Introductionmentioning

confidence: 99%

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Velocity-selected magnetic guiding of Zeeman-decelerated hydrogen atoms

Dulitz

Softley

2016

Eur. Phys. J. D

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Abstract. An original design of magnetic guide is presented, suitable for use with Zeeman-decelerated supersonic beams of ground-state hydrogen atoms and other light paramagnetic species. Three-dimensional particle trajectory simulations show that, by combining a series of permanent-magnet Halbach arrays with pulsed high-current wire electromagnets, this guide can be used to efficiently transmit the slow, decelerated atoms and discard the faster, undecelerated atoms and other species in the gas beam. The curved guide would be suitable for guiding hydrogen atoms into an ion trap to investigate low temperature ion-molecule collisions. It is also shown that the device could be used for the guiding or velocity selection from an undecelerated supersonic or effusive beam.

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Section: Other Applicationsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Velocity-selected magnetic guiding of Zeeman-decelerated hydrogen atoms

Dulitz

Softley

2016

Eur. Phys. J. D

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“…Another possibility -actually demonstrated using thermal beams for basic research -that might yield higher enrichment includes bending the quadrupole over its length in order to suppress line-of-sight between the supersonic valve and the exit aperture for the quadrupole [63,64]. A more serious detriment to the proposal, however, arises from the possibility of material clogging the bore of the quadrupole after prolonged use.…”

Section: Halbach Arrays and One-sided Fluxmentioning

confidence: 99%

Magnetically Activated and Guided Isotope Separation

Mazur¹

2016

Springer Theses

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AcknowledgmentsI first would like to thank Mark Raizen. Speaking to Mark about his research initially motivated me to attend UT Austin. I owe Mark immense gratitude for him giving me the opportunity to do research under his supervision despite my limited background in experimental physics. When I began as a research assistant in Mark's lab in the fall of 2008, Mark and my colleagues at the time had recently pioneered two techniques -the "atomic coilgun" and single-photon cooling -that could in principle be applied in tandem toward the trapping and cooling of almost any atom in addition to many molecules. Being present as these ideas materialized and evolved was exciting and motivating. I thoroughly enjoyed working on applying these techniques toward the trapping and cooling of hydrogen atoms.Mark's ideas evolved into real applications including lithography and isotope separation. What began as "single-photon atomic sorting" ultimately evolved into the topic of this dissertation: Magnetically Activated and Guided Isotope Separation. I am very grateful to Mark for the opportunity to contribute toward realizing MAGIS. Having been able to contribute to both basic research and a very imminent application, I think that my graduate experience has been truly unique. I admire Mark's efforts toward realizing MAGIS as a real tool for producing stable isotopes with diverse and beneficial applications, and I hope that this work will facilitate these efforts. Even while working on pressing research (like MAGIS), Mark afforded me a great deal of creative freedom that benefited me immensely in acquiring expertise in many areas.Part of my unique experience involved working closely with Bruce Klappauf, a research scientist who co-proposed MAGIS with Mark and laid out the framework for our experiment using lithium. Bruce has very impressive experience and knowledge, and I learned a great deal while working on this experiment with him. I greatly appreciated his patience and willingness to explain things that were unclear to me (notably letting me contribute over his shoulder as he setup most of the laser system that we built). iv Bruce's Python simulations that facilitated the design for our apparatus were extremely impressive. Bruce was responsible for all of the simulations discussed in Chapter 2.Prior to working on MAGIS, I worked toward trapping and cooling atomic hydrogen mainly with Adam Libson. I have immense respect for Adam's physical intuition: Adam explained many things to me in a simple manner. Due to my respect for him, Adam substantially influenced my way of thinking as a physicist. Building the quadrupole trap for interfacing to our coilgun was one of the most rewarding experiences for me as a graduate student. When we ran into problems, Adam repeatedly derived solutions; he has a penchant for staying calm and methodically tackling problems. I admire all of his work in Mark's lab, including helium slowing using the rotor apparatus and the early magnetic slowing of neon and molecular oxygen.I also worked closely with ...

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“…Such magnets have been used in a number of experiments to manipulate paramagnetic atoms and molecules. For instance, curved quadrupole, hexapole and octupole guides based on permanent magnets in a Halbach configuration [32] have been used to manipulate slow atomic beams [33][34][35][36]. By extending such a guide, a simple magnetic storage ring can be devised.…”

Section: Storage Rings For Neutral Particlesmentioning

confidence: 99%

A compact design for a magnetic synchrotron to store beams of hydrogen atoms

et al. 2015

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We present a design for an atomic synchrotron consisting of 40 hybrid magnetic hexapole lenses arranged in a circle. We show that for realistic parameters, hydrogen atoms with a velocity up to 600 m s −1 can be stored in a 1 m diameter ring, which implies that the atoms can be injected in the ring directly from a pulsed supersonic beam source. This ring can be used to study collisions between stored hydrogen atoms and supersonic beams of many different atoms and molecules. The advantage of using a synchrotron is two-fold: (i) the collision partners move in the same direction as the stored atoms, resulting in a small relative velocity and thus a low collision energy, and (ii) by storing atoms for many round-trips, the sensitivity to collisions is enhanced by a factor of 100-1000. In the proposed ring, the cross-sections for collisions between hydrogen, the most abundant atom in the universe, with any atom or molecule that can be put in a beam, including He, H 2 , CO, ammonia and OH can be measured at energies below 100 K. We discuss the possibility of using optical transitions to load hydrogen atoms into the ring without influencing the atoms that are already stored. In this way it will be possible to reach high densities of stored hydrogen atoms.

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A hexapole magnetic guide for neutral atomic beams

Cited by 17 publications

References 24 publications

Velocity-selected magnetic guiding of Zeeman-decelerated hydrogen atoms

Velocity-selected magnetic guiding of Zeeman-decelerated hydrogen atoms

Magnetically Activated and Guided Isotope Separation

A compact design for a magnetic synchrotron to store beams of hydrogen atoms

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