Extremely cold antiprotons for antihydrogen production

Gabrielse, Gerald; Jhe, W.; Phillips, David F.; Quint, W.; Tseng, Ching-Shiow; Haarsma, L.; Abdullah, K.; Gröbner, Julian; Kalinowsky, H.

doi:10.1007/bf02316708

Cited by 14 publications

(12 citation statements)

References 25 publications

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“…At the antiproton decelerator [12], it is hoped that around 10 7 cold (temperatures at or below 4.2 K) antiprotons can be stored in a Penning trap. Experiments with such traps at the now-defunct low-energy antiproton ring (LEAR) have clearly demonstrated the feasibility of this goal [13][14][15][16][17]. As an example, the PS200 experiment succeeded in capturing 10 6 antiprotons from a single machine shot (which contained around 10 8 antiprotons at a kinetic energy of approximately 6 MeV), the majority of which were electron-cooled to sub-eV temperatures [16].…”

Section: B Cassidy Et Almentioning

confidence: 99%

“…The CPT theorem requires that the Rydberg and the anti-Rydberg are equal, so a precise comparison of the two would constitute an important test of this theorem. The 2S state is metastable with a lifetime of around 0.14 s and a correspondingly narrow linewidth (1 Hz), and with the 1S-2S transition frequency being ∼ 2.5 × 10 15 Hz, offers the prospect of precisions better than 1 part in 10 15 . Currently, the most precise determinations of this quantity for hydrogen are in the range 10 −12 -10 −13 [8,9].…”

Section: Introductionmentioning

confidence: 99%

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Antihydrogen from positronium impact with cold antiprotons: a Monte Carlo simulation

Cassidy

Merrison

Charlton

et al. 1999

J. Phys. B: At. Mol. Opt. Phys.

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A Monte Carlo simulation of the reaction to form antihydrogen by positronium impact upon antiprotons has been undertaken. Total and differential cross sections have been utilized as inputs to the simulation which models the conditions foreseen in planned antihydrogen formation experiments using positrons and antiprotons held in Penning traps. Thus, predictions of antihydrogen production rates, angular distributions and the variation of the mean antihydrogen temperature as a function of incident positronium kinetic energy have been produced.

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Section: B Cassidy Et Almentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Antihydrogen from positronium impact with cold antiprotons: a Monte Carlo simulation

Cassidy

Merrison

Charlton

et al. 1999

J. Phys. B: At. Mol. Opt. Phys.

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“…2, 27 updated based upon the compilation of the Particle Data Group. 28 We also measured the proton to electron mass ratio and the antiproton to electron mass ratio. Initially this was done as a systematic check on our antiproton to proton comparison.…”

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confidence: 99%

“…Fermi National Accelerator Laboratory (physics colloquium) Oct. 23 University of Rochester (physics colloquium) Oct. 28 Haverford College (physics colloquium) Nov. 7 Massachusetts Institute of Technology (physics tolloquium)…”

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confidence: 99%

Antiproton Studies in Penning Traps

Gabrielse¹

1993

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“…Many of the chapters in this volume, for example Chapter 12 by Greaves and Surko and Chapter 24 by Surko, discuss applications of cold positron beams. In addition cold positron plasmas are useful for studies of positron-normal-matter interactions, such as the study of resonances in low-energy positron annihilation on molecules [3], for production of a plasma whose modes must be treated quantum mechanically [1,7,8], and for formation of antihydrogen by passing cold antiprotons through a reservoir of cold positrons [9,10,11].…”

Section: Introductionmentioning

confidence: 99%

A Laser-cooled Positron Plasma

Jelenković

Bollinger

Newbury

et al.

New Directions in Antimatter Chemistry and Physics

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We present results on trapping and cooling of positrons in a Penning trap. Positrons from a 2 mCi 22 Na source travel along the axis of a 6 T magnet and through the trap after which they strike a Cu reflection moderator crystal. Up to a few thousand positrons are trapped and lose energy through Coulomb collisions (sympathetic cooling) with laser-cooled 9 Be + . By imaging the 9 Be + laser-induced fluorescence, we observe centrifugal separation of the 9 Be + ions and positrons, with the positrons coalescing into a column along the trap axis. This indicates the positrons have the same rotation frequency and comparable density ( 4 × 10 9 cm −3 ) as the 9 Be + ions, and places an upper limit of approximately 5 K on the positron temperature of motion parallel to the magnetic field. We estimate the number of trapped positrons from the volume of this column and from the annihilation radiation when the positrons are ejected from the trap. The measured positron lifetime is > 8 days in our room temperature vacuum of 10 −8 Pa.

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Extremely cold antiprotons for antihydrogen production

Cited by 14 publications

References 25 publications

Antihydrogen from positronium impact with cold antiprotons: a Monte Carlo simulation

Antihydrogen from positronium impact with cold antiprotons: a Monte Carlo simulation

Antiproton Studies in Penning Traps

A Laser-cooled Positron Plasma

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