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Fujiwara, M.; Amoretti, M.; Amsler, C.; Bendiscioli, G.; Bonomi, G.; Bouchta, A.; Bowe, P. D.; Carraro, C.; Charlton, M.; Collier, M. J. T.; Doser, M.; Filippini, V.; Fine, K. S.; Fontana, A.; Funakoshi, R.; Genova, P.; Grögler, Dominik; Hangst, J. S.; Hayano, R.; Higaki, Hidehiko; Holzscheiter, M. H.; Joffrain, Walter; Jørgensen, L. V.; Lagomarsino, V.; Landua, R.; Cesar, C. L.; Lindelöf, D.; Lodi-Rizzini, E.; Macrı́, M.; Madsen, N.; Manuzio, G.; Marchesotti, M.; Montagna, P.; Pruys, H.; Regenfus, C.; Riedler, P.; Rotondi, A.; Rouleau, G.; Salvini, P.; Testera, G.; Werf, D. P. van der; Variola, A.; Venturelli, L.; Watson, T.L.; Yamazaki, T.; Yamazaki, Y.

doi:10.1023/a:1020819321506

Cited by 10 publications

(8 citation statements)

References 7 publications

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“…The antiproton capture and cooling can take place in either of two separate traps; the catching trap, or the mixing trap. In the former case, the cooled antiprotons are adiabatically transferred to the mixing trap after the catching and cooling [17]. The traps (inner radius 1.25 cm) are held at a temperature between 15 and 40 K. The imaging detector is kept at 140 K and housed in a separate vacuum ( Fig.…”

Section: Methodsmentioning

confidence: 99%

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Three Dimensional Annihilation Imaging of Antiprotons in a Penning Trap

Fujiwara

Amoretti²,

Bonomi³

et al. 2003

AIP Conference Proceedings

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We demonstrate three-dimensional annihilation imaging of antiprotons trapped in a Penning trap. Exploiting unusual feature of antiparticles, we investigate a previously unexplored regime in particle transport; the proximity of the trap wall. Particle loss on the wall, the final step of radial transport, is observed to be highly non-uniform, both radially and azimuthally. These observations have considerable implications for the production and detection of antihydrogen atoms.Comment: Invited Talk at NNP03, Workshop on Non-Neutral Plasmas, 200

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Section: Methodsmentioning

confidence: 99%

“…The squares refer to measurements with 10 8 electrons kept in the trap, whilst the circles are with less than 10 5 electrons remaining. The trapped antiprotons are counted with external annihilation detectors [17], and are normalized to the incoming antiproton number, which in turn is measured by a calibrated beam detector [18].…”

Section: Methodsmentioning

confidence: 99%

Three Dimensional Annihilation Imaging of Antiprotons in a Penning Trap

Fujiwara

Amoretti²,

Bonomi³

et al. 2003

AIP Conference Proceedings

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“…If the electric trapping potential is larger than antiproton recoil energy (which should be less than few eV), antiprotons will be "born trapped". After accumulating a certain number of ionized antiprotons in the collecting well, they can be dumped onto the degrader in a usual manner [14], providing an efficient, nearly background free detection. See Fig.…”

Section: Electron Impact Ionization Of Antihydrogen Atomsmentioning

confidence: 99%

Detecting Antihydrogen: The Challenges and the Applications

Fujiwara

2005

AIP Conference Proceedings

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ATHENA's first detection of cold antihydrogen atoms relied on their annihilation signatures in a sophisticated particle detector. We will review the features of the ATHENA detector and its applications in trap physics. The detector for a new experiment ALPHA will have considerable challenges due to increased material thickness in the trap apparatus as well as field non-uniformity. Our studies indicate that annihilation vertex imaging should be still possible despite these challenges. An alternative method for trapped antihydrogen, via electron impact ionization, will be also discussed.Comment: Invited paper at International Workshop on Physics with Ultra-Slow Antiprotons, RIKEN, Japan, March 2005. To be published in AIP Conference Proceeding

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“…The Antiproton Decelerator facility located at CERN provides typically 2 10 7 antiprotons having kinetic energy of 5.3 MeVevery 100 s. They are slowed in a degrader foil and trapped dynamically using a pulsed electric field. Preloaded cold electrons in a 3 T magnetic field cool the antiprotons by Coulomb collisions from keV to meV energies [14,15]. For the measurements reported here, 10 3 to 10 4 cold antiprotons, together with 10 7 to 10 8 electrons, are held in the central trap region (the so-called mixing trap, Fig.…”

mentioning

confidence: 98%

“…In the reported measurements, Note that the antiproton cyclotron frequency is 46 MHz and the radius 1:7-2:8 m in a 3 T magnetic field, and the single particle axial and magnetron frequencies for our harmonic trap are 490 and 2.6 kHz, respectively. With most of the electrons in the trap removed [21], antiproton radial transport is greatly altered and generally suppressed, making it harder to obtain annihilation images on the wall, especially for a short harmonic potential, in which the storage time exceeds 10 h [15]. Loss images could be obtained in a longer trap (length 10 cm) with the electrons removed, and they do indeed show hot spots.…”

mentioning

confidence: 99%

Three-Dimensional Annihilation Imaging of Trapped Antiprotons

Fujiwara¹,

Amoretti²,

Bonomi³

et al. 2004

Phys. Rev. Lett.

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We demonstrate three-dimensional imaging of antiprotons in a Penning trap, by reconstructing annihilation vertices from the trajectories of the charged annihilation products. The unique capability of antiparticle imaging has allowed, for the first time, the observation of the spatial distribution of the particle loss in a Penning trap. The radial loss of antiprotons on the trap wall is localized to small spots, strongly breaking the azimuthal symmetry expected for an ideal trap. Our observations have important implications for detection of antihydrogen annihilations.

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Cited by 10 publications

References 7 publications

Three Dimensional Annihilation Imaging of Antiprotons in a Penning Trap

Three Dimensional Annihilation Imaging of Antiprotons in a Penning Trap

Detecting Antihydrogen: The Challenges and the Applications

Three-Dimensional Annihilation Imaging of Trapped Antiprotons

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