Pulsed Sisyphus Scheme for Laser Cooling of Atomic (Anti)Hydrogen

Wu, Saijun; Brown, Richard Harvey; Phillips, William D.; Porto, J. V.

doi:10.1103/physrevlett.106.213001

Cited by 21 publications

(28 citation statements)

References 28 publications

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“…Thus, while laser cooling for a confined Ps gas can be envisioned [676], the effects of confinement would have to be explicitly addressed, either by using sufficiently large cavities or other confining structures [123], or possibly by using alternative cooling schemes employing short-pulsed lasers (e.g. [677,678]). …”

Section: Bose-einstein Condensationmentioning

confidence: 99%

Experimental progress in positronium laser physics

2018

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Abstract. The field of experimental positronium physics has advanced significantly in the last few decades, with new areas of research driven by the development of techniques for trapping and manipulating positrons using Surko-type buffer gas traps. Large numbers of positrons (typically ≥10 6 ) accumulated in such a device may be ejected all at once, so as to generate an intense pulse. Standard bunching techniques can produce pulses with ns (mm) temporal (spatial) beam profiles. These pulses can be converted into a dilute Ps gas in vacuum with densities on the order of 10 7 cm −3 which can be probed by standard ns pulsed laser systems. This allows for the efficient production of excited Ps states, including long-lived Rydberg states, which in turn facilitates numerous experimental programs, such as precision optical and microwave spectroscopy of Ps, the application of Stark deceleration methods to guide, decelerate and focus Rydberg Ps beams, and studies of the interactions of such beams with other atomic and molecular species. These methods are also applicable to antihydrogen production and spectroscopic studies of energy levels and resonances in positronium ions and molecules. A summary of recent progress in this area will be given, with the objective of providing an overview of the field as it currently exists, and a brief discussion of some future directions.

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Section: Bose-einstein Condensationmentioning

confidence: 99%

Experimental progress in positronium laser physics

2018

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“…With the recent trapping of anti-hydrogen in its ground state, a larger beam would also prove beneficial in mitigating the difficulties created by the low number of trapped anti-hydrogen atoms available [12,13]. However, we are mainly motivated to develop a power scalable 243 nm laser in order to explore proposals to laser cool atomic hydrogen using the 1S-2S transition [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Two photon laser cooling could be more rapid and flexible than the more traditional approach using Lyman-alpha radiation at 121.6 nm -mostly due to the greater ease at producing radiation at 243 nm. To obtain reasonable scattering rates with such schemes requires that the 2S state is coupled to a state with short lifetime, for instance either the 2P [15] or 3P [16] states, and the average power of the cavity enhanced 243 nm radiation source should be at the ∼100 W level. For a beam diameter of ∼ 500 µm, this would lead to a scattering rate of ∼500 Hz when maximally coupling the 2S and 2P states [15].…”

Section: Introductionmentioning

confidence: 99%

Yb Fiber Amplifier at 972.5 nm with Frequency Quadrupling to 243.1 nm

Burkley¹,

Rasor²,

Cooper³

et al. 2018

Exploring the World With the Laser

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“…Then isolating the z component of F = m d 2 r dt 2 , an oscillatory equation of motion is found: 14) where ω z = qV 0 md 2 . In thex andŷ directions, however, the equations of motion have only exponential, and therefore unconfined, solutions.…”

Section: Single Particle Confinementmentioning

confidence: 99%

“…Moreover, to assist spectroscopic efforts, there are a number of schemes to further cool and de-excite the antihydrogen atoms to the ground state [12][13][14].…”

Section: Precision Comparison Of the Properties Of Hydrogen And Antihmentioning

confidence: 99%

Detection of Trapped Antihydrogen

Hydomako

2013

Springer Theses

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The ALPHA experiment is an international effort to produce, trap, and perform precision spectroscopic measurements on antihydrogen (the bound state of a positron and an antiproton). Based at the Antiproton Decelerator (AD) facility at CERN, the ALPHA experiment has recently magnetically confined antihydrogen atoms for the first time. A crucial element in the observation of trapped antihydrogen is ALPHA's silicon vertexing detector. This detector contains sixty silicon modules arranged in three concentric layers, and is able to determine the three-dimensional location of the annihilation of an antihydrogen atom by reconstructing the trajectories of the produced annihilation products.This dissertation focuses mainly on the methods used to reconstruct the annihilation location. Specifically, the software algorithms used to identify and extrapolate charged particle tracks are presented along with the routines used to estimate the annihilation location from the convergence of the identified tracks. It is shown that these methods can determine the annihilation location with a spatial resolution between about 0.6 to 0.8 cm (depending on the coordinate being measured). Furthermore, a robust analysis to identify and reduce cosmic ray background events is described. The cosmic ray background can obscure the trapped antihydrogen signal, and its suppression leads to a significant increase in the annihilation detection sensitivity. The background suppression analysis involves examining the reconstructed detector event based on several selection criteria, including: the number of charged particle tracks, the radial vertex position, and a fit of a straight line to the event hit positions. By carefully optimizing these criteria, (99.54 ± 0.02)% of cosmic ray events are rejected, while (64.4 ± 0.1)% of antihydrogen annihilation events are retained. Finally, the experimental results demonstrating the first-ever magnetic confinement of antihydrogen atoms are presented. These results rely heavily on the silicon i detector, and as such, the role of the annihilation vertex reconstruction is emphasized.

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Pulsed Sisyphus Scheme for Laser Cooling of Atomic (Anti)Hydrogen

Cited by 21 publications

References 28 publications

Experimental progress in positronium laser physics

Experimental progress in positronium laser physics

Yb Fiber Amplifier at 972.5 nm with Frequency Quadrupling to 243.1 nm

Detection of Trapped Antihydrogen

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