Autoresonant-spectrometric determination of the residual gas composition in the ALPHA experiment apparatus

Amole, C.; Ashkezari, M. D.; Baquero-Ruiz, M.; Bertsche, W.; Butler, E.; Capra, A.; Cesar, C. L.; Chapman, S.; Charlton, M.; Eriksson, S.; Fajans, J.; Friesen, T.; Fujiwara, M.; Gill, D. R.; Gutiérrez, A.; Hangst, J. S.; Hardy, W. N.; Hayden, M. E.; Isaac, C. A.; Jonsell, Svante; Kurchaninov, L. L.; Little, A.; Madsen, N.; McKenna, J. T. K.; Napoli, S. C.; Nolan, P.; Olchanski, K.; Olin, Å.; Povilus, A.; Pusa, P.; Rasmussen, C. Ø.; Robicheaux, F.; Sarid, E.; Silveira, D. M.; Stracka, S.; So, C.; Thompson, R. I.; Turner, M.; Werf, D. P. van der; Wurtele, J. S.; Zhmoginov, Andrey

doi:10.1063/1.4811527

Cited by 2 publications

(4 citation statements)

References 19 publications

(27 reference statements)

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“…Previous ALPHA studies have successfully used an oscillating electric signal on a trap electrode to perform AR [98,94], so it was decided that this method would be used to remove all species except protons. It was believed that the AR method would require an initially cold plasma to successfully couple the charged particles to a frequency chirp.…”

Section: Discussionmentioning

confidence: 99%

“…Validating the identity of the ions is essential for any future studies involving these particles. Charge-to-mass spectrometry measurements have previously been conducted within ALPHA [94,95], using either an autoresonance method or a timeof-flight method. Obtaining absolute charge-to-mass values from autoresonance requires modelling the system, which is a separate study.…”

Section: Identification Of Ionsmentioning

confidence: 99%

“…Autoresonance has been used to excite the axial energy of trapped charges particles by applying an oscillating voltage, generated by a waveform generator, to one of the electrodes involved in particle trapped. This technique has been used in the Atom Trap to control the mixing energies of antiprotons and positrons for antihydrogen production [98], and to perform mass-spectroscopy of ionised residual gas [94,99]. However, the later study did not extend its techniques for producing specific or single species plasma, though this work has been inspired by it.…”

Section: Theory Of Autoresonancementioning

confidence: 99%

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A proton source in the ALPHA apparatus for precision measurements of antihydrogen and hydrogen

Mullan¹

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The apparent lack of antimatter within our local solar system, the Milky Way, and at Galactic boundaries is inconsistent with the Big Bang hypothesis. This disagreement has motivated many experiments to compare the properties and behaviour of antimatter and matter. The ALPHA (Antihydrogen Laser PHysics Apparatus) experiment produce, trap and study antihydrogen. This synthesis involves antiprotons sourced from the limited schedule of the Antiproton Decelerator facility. The restricted availability hinders the number of novel antiproton experiments, which could potentially increase the number of trapped antihydrogen atoms per Antiproton Decelerator cycle. Some of these studies can be performed using a substitute for antiprotons, such as protons, allowing the limited antiprotons to be used during the implementation of their results. This research demonstrates a method that adapts an existing Penning trap to produce protons on demand within reasonable operating time scales of minutes. The availability of protons enables the consideration of new physics studies within ALPHA, including hydrogen formation, trapping, and possibly in situ hydrogenantihydrogen comparisons. The study produced protons from radiofrequency-driven electrons through electron impact ionisation of the cryogenic Penning trap residual gas. The resulting positive ions were sympathetically cooled and compressed by positrons. All positive ions, except protons, were ejected from the trapping potentials using the autoresonance method. The remaining trapped population is approximately (0.9 − 1.2) × 10 6 protons. This research proves the feasibility of generating protons within the ALPHA apparatus, paving the way for future prospects of hydrogen generation.

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Section: Discussionmentioning

confidence: 99%

Section: Identification Of Ionsmentioning

confidence: 99%

Section: Theory Of Autoresonancementioning

confidence: 99%

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A proton source in the ALPHA apparatus for precision measurements of antihydrogen and hydrogen

Mullan¹

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“…These are mostly hydrogen ions. The residual gas also comprises some He, N 2 and O 2 [181]. Nitrogen originates from the Positron Accumulator and it is transferred together with positrons.…”

Section: Electrons and Ionsmentioning

confidence: 99%

Laser-cooled Be+ for improved antihydrogen trapping and magnetometry

Peszka

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Autoresonant-spectrometric determination of the residual gas composition in the ALPHA experiment apparatus

Cited by 2 publications

References 19 publications

A proton source in the ALPHA apparatus for precision measurements of antihydrogen and hydrogen

A proton source in the ALPHA apparatus for precision measurements of antihydrogen and hydrogen

Laser-cooled Be+ for improved antihydrogen trapping and magnetometry

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