Progress of Antihydrogen Beam Production Using a Double Cusp Trap

The ASACUSA CUSP experiment plans a high precision spectroscopy of the ground-state hyperfine splitting of antihydrogen to test CPT symmetry. To perform this, a Rabi-like antiatomic beam method has been developed with a novel double-cusp trap. Antihydrogen atoms were synthesized in the double-cusp trap by directly injecting antiprotons from an accumulation trap into a positron plasma. By adjusting the energy difference between the incoming antiproton beam and the positron plasma, a high-rate production of antihydrogen atoms was observed.

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“…As was discussed in Ref. [7], the configuration of the double-cusp magnetic field improves the focusing performance by a factor of 10 .…”

Section: Musashi Trapmentioning

confidence: 77%

Antihydrogen Synthesis in a Double-Cusp Trap

Kuroda

Tajima

Radics

et al. 2017

Proceedings of the 12th International Conference on Low Energy Antiproton Physics (LEAP2016)

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“…Figure 8(b) is a 3D mapping of the magnetic field strength, jBðr; zÞj, of the double cusp magnet. 98) As can be seen, jBj is stronger for a larger radial distance, i.e., Hs in the LFS states are decelerated radially and reflected back toward the axis. It is noted that the decelerating and accelerating field configuration along the axis is somewhat similar to the electric field configuration of an Einzel lens for charged particles.…”

Section: Extra Low Energy Antiproton Ring (Elena)mentioning

confidence: 81%

“…Figure 8 (b) is a 3D mapping of the magnetic field strength,

, of the double cusp magnet. 98 ) As can be seen,

is stronger for a larger radial distance, i.e. ,

s in the LFS states are decelerated radially and reflected back toward the axis.…”

Section: Production and Manipulation Of Cold Antihydrogenmentioning

confidence: 82%

“…(b) 3D magnetic field strength distribution of the double cusp magnet. 98) magnetic bottle, which is an Ioffe-Pritchard type, but selecting an octupole coil instead of a traditional quadrupole coil. Actually, jBj of the quadrupole and octupole magnets near the magnet axis is / r and / r 2 , respectively, i.e., the non-uniformity near the axis along the azimuthal direction is much suppressed for the octupole magnet, which greatly helps to trap charged particles (antiprotons and positrons) stably.…”

Section: Extra Low Energy Antiproton Ring (Elena)mentioning

confidence: 99%

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Cold and stable antimatter for fundamental physics

Yamazaki

2020

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

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The field of cold antimatter physics has rapidly developed in the last 20 years, overlapping with the period of the Antiproton Decelerator (AD) at CERN. The central subjects are CPT symmetry tests and Weak Equivalence Principle (WEP) tests. Various groundbreaking techniques have been developed and are still in progress such as to cool antiprotons and positrons down to extremely low temperature, to manipulate antihydrogen atoms, to construct extremely high-precision Penning traps, etc. The precisions of the antiproton and proton magnetic moments have improved by six orders of magnitude, and also laser spectroscopy of antihydrogen has been realized and reached a relative precision of 2 × 10 −12 during the AD time. Antiprotonic helium laser spectroscopy, which started during the Low Energy Antiproton Ring (LEAR) time, has reached a relative precision of 8 × 10 −10 . Three collaborations joined the WEP tests inventing various unique approaches. An additional new post-decelerator, Extra Low ENergy Antiproton ring (ELENA), has been constructed and will be ready in 2021, which will provide 10–100 times more cold antiprotons to each experiment. A new era of the cold antimatter physics will emerge soon including the transport of antiprotons to other facilities.

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“…The experiment managed to increase the relative precision of the measurements from year to year, reaching the order of 10 12 (meaning a -test of similar precision) using two-photon spectroscopy [16] and buffergas cooling [17]. The ASACUSA Collaboration has built a post-decelerator system (essentially a radiofrequency quadrupole accelerator cavity working the opposite way) which increased the trapping efficiency by orders of magnitude and made it possible to produce an extracted beam [18] of slow antihydrogen atoms.…”

Section: Antiproton Propertiesmentioning

confidence: 99%

Tests of the CPT Invariance at the Antiproton Decelerator of CERN

Horváth

2019

Ukr. J. Phys.

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The Standard Model, the theory of particle physics is based on symmetries: both the structure of the composite particles and their interactions are derived using gauge invariance principles. Some of these are violated by the weak interaction like parity and CP symmetry, and even masses are created via spontaneous symmetry breaking. CPT invariance, the most essential symmetry of the Standard Model, states the equivalency of matter and antimatter. However, because of the lack of antimatter in our Universe it is continuously tested at CERN. We overview these experiments: measuring the properties of antiprotons as compared to those of the proton at the Antiproton Decelerator and also searching for antimatter in cosmic rays.

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Progress of Antihydrogen Beam Production Using a Double Cusp Trap

Abstract: We report the progress of theH beam production experiment and recent developments of the double cusp trap to improve of the beam intensity of theH atomic beams, the ASACUSA Micromegas tracker to monitoring the antihydrogen synthesis and the antihydrogen beam detector.

Cited by 7 publications

References 25 publications

Antihydrogen Synthesis in a Double-Cusp Trap

Antihydrogen Synthesis in a Double-Cusp Trap

Cold and stable antimatter for fundamental physics

Tests of the CPT Invariance at the Antiproton Decelerator of CERN

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