Confinement of a Large Number of Antiprotons and Production of an Ultraslow Antiproton Beam

Kuroda, N.; Torii, H. A.; Franzen, K. Y.; Wang, Z.; Yoneda, S; Inoue, Masaharu; Hori, Masaki; Juhász, B.; Horváth, D.; Higaki, Hidehiko; Mohri, A.; Eades, J.; Komaki, K.; Yamazaki, Y.

doi:10.1103/physrevlett.94.023401

Cited by 81 publications

(44 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Integrating the number of antiproton annihilations over all the positions, we obtain the total number of trapped antiprotons. With this trap, we successfully confined 1.2 × 10 6 cooled antiprotons until the end of our trap cycle of 1-5 minutes [15]. Typically 1 million antiprotons were trapped for each AD shot.…”

Section: Confinement and Coolingmentioning

confidence: 99%

Atomic collision experiment using ultra-slow antiproton beams

Torii

Kuroda

Shibata

et al. 2007

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Abstract. The development of techniques to decelerate, cool and confine antiprotons in vacuo with an electromagnetic trap has opened a new research field of atomic physics of 'cold' antiprotons, including synthesis of antihydrogen atoms. At the Antiproton Decelerator (AD) facility at CERN, we the MUSASHI group of ASACUSA collaboration have so far achieved efficient confinement of millions of antiprotons in a Multi-Ring electrode Trap (MRT) installed in a superconducting magnet of 2.5 T, by a sequential combination of the AD (down to 5.3 MeV), an RFQD (Radio-Frequency Quadrupole Decelerator; down to 50-120 keV) and the MRT. Antiprotons, cooled to energies less than an electronvolt by preloaded electrons in the trap, was then extracted out of the magnetic field and transported along a 3-m beamline as a monoenergetic beam of 10-500 eV. With this unique ultra-low-energy antiproton beam, we are now planning the first atomic collision experiments under single collision conditions, to measure ionization and atomic capture cross sections of antiprotons against helium atoms. A supersonic atomic gas-jet target is prepared and crossed with the antiproton beam. Antiprotons as well as electrons emitted during the reaction will be detected by a microchannel plate (MCP) while the antiproton annihilation will be recognized by detection of annihilation products -mostly pions -by surrounding scintillation counters. When the antiproton is captured, it forms a neutral antiprotonic helium atom, some in a metastable state whose level structures have been well studied with spectroscopic methods. Severe identification of particles and atoms plays an essential role in the design of the experiment, to distinguish the small number of reaction events out of a huge pile of background events. Our strategies for our near-future experiments are discussed.

show abstract

Section: Confinement and Coolingmentioning

confidence: 99%

Atomic collision experiment using ultra-slow antiproton beams

Torii

Kuroda

Shibata

et al. 2007

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…It consists of a linear decelerator followed by the so-called cooler trap, a Penning trap where ion bunches can be injected, stored and cooled before extraction of beams with the properties required by the experiments downstream. A similar scenario is realized by the ASACUSA Collaboration at the Antiproton Decelerator at CERN where antiprotons are accumulated and stochastically cooled in a storage ring, ejected, and decelerated in a radio frequency quadrupole accelerator operated in inverse mode, and finally injected into a cylindrical Penning trap for accumulation and cooling [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Numerical investigations on resistive cooling of trapped highly charged ions

et al. 2011

View full text Add to dashboard Cite

The investigation of simple atomic systems in extreme electromagnetic fields with highest precision demands intense beams of heavy and highly charged ions to be decelerated and cooled to extremely low energies for long-time observation. Resistive cooling, i.e., the electronic dissipation of energy of a stored ion cloud on an external impedance, seems to be a good candidate for in-trap cooling of highly charged ions and has been chosen for the upcoming HI-TRAP (Highly charged Ion TRAP) facility at GSI, Darmstadt. Nevertheless, resistive cooling of large ensembles of ions confined in a Penning trap has never been thoroughly studied until now and the understanding of this highly nonlinear phenomenon is far from complete. Through the use of systematic simulations we give a proof of the feasibility of resistive cooling of large numbers of highly charged ions as

show abstract

“…Cold electron plasmas confined in this type of traps are now being used in several applications, including cooling of highly charged ions, 13,14 cooling of antiprotons for antihydrogen production at CERN, 7,15,16 and for positron accumulation. 17 To broaden the range of these applications, long lifetime and high density electron plasma are necessary.…”

mentioning

confidence: 99%

Comparison of non-neutral electron plasma confinement in harmonic and rectangular potentials in a very dense regime

2013

Self Cite

View full text Add to dashboard Cite

Comparison of non-neutral electron plasma confinement in harmonic and rectangular potentials in a very dense regime Confinement of high density electron plasmas in a strong uniform magnetic field was experimentally studied in a multi-ring trap (MRT). The trap was housed inside a bore tube and surrounded by a superconducting solenoid. A 5 T magnetic field was used to provide radial confinement while an electrostatic harmonic or rectangular potential well was used for axial confinement. For trapped electrons of N ¼ 1.2 Â 10 10 in a harmonic potential well (HPW) with the trap length of L T ¼ 320 mm, the plasma lifetime was about 10 4 s and it became much longer at lower N ¼ 4.5 Â 10 9. Such long holding times were achieved without application of rotating electric fields. Contrastingly, in a rectangular potential well (RPW), the plasma of N ¼ 1.2 Â 10 10 under the same trap length expanded to cover the whole Faraday Cup within 200 s, where its radial expansion rate was g ¼ 3.2 Â 10 À2 mm/s, which was 20 times faster than HPW. The lifetime for RPW became shorter with increasing L T and scaled as 1/[L T ] 2

show abstract

Confinement of a Large Number of Antiprotons and Production of an Ultraslow Antiproton Beam

Cited by 81 publications

References 20 publications

Atomic collision experiment using ultra-slow antiproton beams

Atomic collision experiment using ultra-slow antiproton beams

Numerical investigations on resistive cooling of trapped highly charged ions

Comparison of non-neutral electron plasma confinement in harmonic and rectangular potentials in a very dense regime

Contact Info

Product

Resources

About