An atomic coilgun: using pulsed magnetic fields to slow a supersonic beam

Narevicius, Edvardas; Parthey, Christian G.; Libson, A.; Narevicius, Julia; Chavez, Isaac; Even, U.; Raizen, Mark G.

doi:10.1088/1367-2630/9/10/358

Cited by 71 publications

(55 citation statements)

References 12 publications

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“…The magnetic field was also measured using a small Faraday rotation crystal [38,39] inserted inside the coil. The magnetic fields generated by the coil interact with the plunger to create an actuating force of about 10 N. The air gap and therefore the free movement of the plunger are limited to 50 m only.…”

Section: Valve Designmentioning

confidence: 99%

Pulsed Supersonic Beams from High Pressure Source: Simulation Results and Experimental Measurements

Even

2014

Advances in Chemistry

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Pulsed beams, originating from a high pressure, fast acting valve equipped with a shaped nozzle, can now be generated at high repetition rates and with moderate vacuum pumping speeds. The high intensity beams are discussed, together with the skimmer requirements that must be met in order to propagate the skimmed beams in a high-vacuum environment without significant disruption of the beam or substantial increases in beam temperature.

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Section: Valve Designmentioning

confidence: 99%

Pulsed Supersonic Beams from High Pressure Source: Simulation Results and Experimental Measurements

Even

2014

Advances in Chemistry

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“…Similar effects were previously discussed in Refs. [12,61,63,70,71,72,73,74,75]. With the effective-mass formalism, these effects can now be explained within a unified approach.…”

Section: Longitudinal Massmentioning

confidence: 99%

Positive and negative effective mass of classical particles in oscillatory and static fields

Dodin

Fisch

2008

Phys. Rev. E

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A classical particle oscillating in an arbitrary high-frequency or static field effectively exhibits a modified rest mass m eff derived from the particle averaged Lagrangian. Relativistic ponderomotive and diamagnetic forces, as well as magnetic drifts, are obtained from the m eff dependence on the guiding center location and velocity. The effective mass is not necessarily positive and can result in backward acceleration when an additional perturbation force is applied. As an example, adiabatic dynamics with m|| > 0 and m|| < 0 is demonstrated for a wave-driven particle along a dc magnetic field, m|| being the effective longitudinal mass derived from m eff . Multiple energy states are realized in this case, yielding up to three branches of m|| for a given magnetic moment and parallel velocity.

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“…The development of the technique of multistage Zeeman deceleration [11][12][13][14][15][16], the magnetic analogue of multistage Stark deceleration has expanded the range of species which can be adiabatically decelerated to include all paramagnetic atoms and molecules. Multistage Zeeman deceleration can be added to the broad range of techniques now available for the production of cold molecules [17][18][19][20][21][22].…”

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confidence: 99%

Magnetic Trapping of Hydrogen after Multistage Zeeman Deceleration

et al. 2008

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We report the first experimental realization of magnetic trapping of a sample of cold radicals following multistage Zeeman deceleration of a pulsed supersonic beam. H atoms seeded in a supersonic expansion of Kr have been decelerated from an initial velocity of 520 m=s to 100 m=s in a 12-stage Zeeman decelerator and loaded into a magnetic quadrupole trap by rapidly switching the fields of the trap solenoids. DOI: 10.1103/PhysRevLett.101.143001 PACS numbers: 37.10.Mn, 32.60.+i Since the demonstration of magnetic trapping of lasercooled atoms [1] a range of techniques, involving the use of inhomogeneous electric or magnetic fields, have been developed to control the translational motion of, and confine neutral species which cannot be laser cooled. The goals of these techniques are to produce (ultra-)cold samples of a wide range of atoms and molecules, and to exploit such samples in a variety of applications such as precision spectroscopy, studies of molecular collisions at very low energies and of molecular gases close to quantum degeneracy. The present Letter describes the first experimental realization of magnetic trapping of a sample of cold radicals following adiabatic deceleration of a pulsed supersonic beam in a multistage Zeeman decelerator. Supersonic beams provide internally cold, dense (10 14 -10 15 cm À3 ) atomic or molecular samples with a high longitudinal velocity and a narrow longitudinal velocity spread. Adiabatic deceleration of such samples enables one to preserve the phase-space density from the source to the point where the sample is brought to rest in the laboratory frame.Phase-stable multistage deceleration of pulsed supersonic beams of polar molecules was realized by Bethlem et al. using a multistage Stark decelerator [2,3]. This work led to electrostatic trapping of Stark-decelerated samples of ammonia at temperatures of $30 mK [4] and to the determination of the lifetime of the metastable a 3 Å state of CO [5]. Polar OH molecules have also been loaded into electrostatic [6] and magnetoelectrostatic [7] traps following multistage Stark deceleration.Rydberg Stark deceleration has also been used to decelerate [8,9] and electrostatically trap samples excited to well-defined Rydberg states at temperatures of $150 mK [10], while maintaining the phase-space density of the initially excited bunch. The development of the technique of multistage Zeeman deceleration [11][12][13][14][15][16], the magnetic analogue of multistage Stark deceleration has expanded the range of species which can be adiabatically decelerated to include all paramagnetic atoms and molecules. Multistage Zeeman deceleration can be added to the broad range of techniques now available for the production of cold molecules [17][18][19][20][21][22]. The ability to trap such species magnetically following deceleration presents several advantages for the applications listed above: (i) Radicals are reactive species and several radical-radical reactions are near barrierless and take place at very low temperatures [23], (ii) the elect...

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An atomic coilgun: using pulsed magnetic fields to slow a supersonic beam

Cited by 71 publications

References 12 publications

Pulsed Supersonic Beams from High Pressure Source: Simulation Results and Experimental Measurements

Pulsed Supersonic Beams from High Pressure Source: Simulation Results and Experimental Measurements

Positive and negative effective mass of classical particles in oscillatory and static fields

Magnetic Trapping of Hydrogen after Multistage Zeeman Deceleration

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