Positron storage ring for positronium and antihydrogen generation in flight: The LEPTA project

Мешков, И. Н.; Seleznev, I. A.; Sidorin, A. O.; Smirnov, Alexander V.; Trubnikov, G.; Yakovenko, S. L.

doi:10.1016/j.nimb.2003.08.024

Cited by 7 publications

(3 citation statements)

References 17 publications

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“…The Low Energy Particle Toroidal Accumulator (LEPTA) with circulating electrons was commissioned in September 2004 [1]. The main goal of the LEPTA is generation intense ux of the positronium atoms [2]. Preparation of the accumulator for circulating positron beam now is made.…”

Section: Introductionmentioning

confidence: 99%

Positron injector for LEPTA

Bykovsky

Kobets

Korotaev

et al. 2008

Phys. Part. Nuclei Lett.

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The injector of the low energy positrons for accumulator LEPTA is being assembled at JINR. The key elements of the injector have been tested. The cryogenic source of slow positrons has been tested with a test isotope 22 Na of the initial activity of 0.8 MBk. The continuous slow positron beam intensity of 5.8 · 10 3 s −1 with average energy of 1.2 eV and width of a spectrum 1 eV has been obtained. The achieved moderator efˇciency is about 1%. The accumulation process in the positron trap was investigated with electron ux. The lifetime of the electrons in the trap, τ life 80 s and capture efˇciency ε ∼ 0.4 have been obtained. The maximum number of the accumulated particle was Nexp = 2 · 10 8 at the initial ux of 5 · 10 6 e − /s. ‚ ˆŸˆ § ¢¥·Ï ¥É¸Ö¸¡μ·± ¨³ ¶Ê²Ó¸´μ£μ¨´¦¥±Éμ· ¶μ §¨É·μ´μ¢´¨ §±μ°Ô´¥·£¨¨¤²Ö Ê¸É -μ¢±¨LEPTA. ·μ¢¥¤¥´μ Ô±¸ ¶¥·¨³¥´É ²Ó´μ¥¨¸¸²¥¤μ¢ ´¨¥ · ¡μÉÒ μ¸´μ¢´ÒÌ Ê §²μ¢¨´¦¥±Éμ· .¸¸² ¥¤μ¢ ´ · ¡μÉ ±·¨μ£¥´´μ£μ¨¸ÉμÎ´¨± ¶μ §¨É·μ´μ¢¸É¥¸Éμ¢Ò³¨ §μÉμ ¶μ³ 22 Na, ±É¨¢´μ¸ÉÓÕ 0,8 OE±. μ²ÊÎ¥´ ¶ÊÎμ± ³¥¤²¥´´ÒÌ ¶μ §¨É·μ´μ¢¨´É¥´¸¨¢´μ¸ÉÓÕ 5,8 · 10 3 c −1¸μ¸· ¥¤´¥°Ô´¥·£¨¥°1 ,2 Ô‚ ¶·¨Ï¨·¨´¥¸ ¶¥±É· 1 Ô‚. "μ²Ö § ³¥¤²¥´´ÒÌ ¶μ §¨É·μ´μ¢¸μ¸É ¢¨² 1% μÉ ¶μ²´μ£μ ¶μ-Éμ± . ·μ¢¥¤¥´μ¨¸¸²¥¤μ¢ ´¨¥ ¶·μÍ¥¸¸ ´ ±μ ¶²¥´¨Ö Î ¸É¨Í ¢ ²μ¢ÊÏ±¥´ Ô²¥±É·μ´ Ì. ‚ ·¥ §Ê²ÓÉ É¥ μ ¶É¨³¨ § Í¨¨ ¶ · ³¥É·μ¢ ²μ¢ÊÏ±¨¤μ¸É¨£´ÊÉμ ¢·¥³Ö ¦¨ §´¨´ ±μ ¶²¥´´ÒÌ Ô²¥±É·μ´μ¢ τ life 80¸, ÔËË¥±É¨¢´μ¸ÉÓ § Ì¢ É ε ∼ 0,4, ÎÉμ¸μμÉ¢¥É¸É¢Ê¥É´ ¨²ÊÎÏ¨³ ·¥ §Ê²ÓÉ É ³, ¶μ²ÊÎ¥´´Ò³ ¢ ²μ-¢ÊÏ± Ì ¶μ¤μ¡´μ£μ É¨ ¶ . ·¨ÔÉμ³ ³ ±¸¨³ ²Ó´μ¥ Î¨¸²μ´ ±μ ¶²¥´´ÒÌ Î ¸É¨Í Nexp = 2 · 10 8 ¶· ¶ ¥·¢μ´ Î ²Ó´μ³ ¶μÉμ±¥ 5 · 10 6 e − /¸.

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Section: Introductionmentioning

confidence: 99%

Positron injector for LEPTA

Bykovsky

Kobets

Korotaev

et al. 2008

Phys. Part. Nuclei Lett.

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“…New experimental results on this system are expected by improving the sensitivity of the previously developed techniques based on the o−P s production in a low density SiO 2 target [9]. Other possible experiments, such as the search for mirror type dark matter via the o − P s → invisible decay mode [10]- [12], precise measurements of the o − P s decay rate [13] and others [14], require the production and subsequent decay of o − P s to occur in vacuum. For these experiments a specially designed slow positron beam operating in a pulsed mode with a repetition period of ≃ 1 µs has been constructed.…”

Section: Introductionmentioning

confidence: 99%

Development of a high-efficiency pulsed slow positron beam for measurements with orthopositronium in vacuum

Albérola

Anthonioz

Badertscher

et al. 2006

Nuclear Instruments and Methods in Physics Research Section A:

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We have developed a high-efficiency pulsed slow positron beam for experiments with orthopositronium in vacuum. The new pulsing scheme is based on a double-gap coaxial buncher powered by an RF pulse of appropriate shape. The modulation of the positron velocity in the two gaps is used to adjust their time-of-flight to a target. This pulsing scheme allows to minimize non-linear aberrations in the bunching process and to efficiently compress positron pulses with an initial pulse duration ranging from ∼ 300 to 50 ns into bunches of 2.3 to 0.4 ns width, respectively, with a repetition period of 1 µs. The compression ratio achieved is ≃ 100, which is a factor 5 better than has been previously obtained with slow positron beams based on a single buncher. Requirements on the degree, to which the moderated positrons should be mono-energetic and on the precision of the waveform generation are presented. Possible applications of the new pulsed positron beam for measurements of thin films are discussed.

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“…Intense pencil beams of ortho-positronium (30 -1.7 × 10 4 s −1 ) can be produced based on a low energy positron storage ring equipped with an electron cooling system [27]. This may accumulate about 10 12 three-photon events in ortho-positronium decay a year.…”

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confidence: 99%

New possibilities for testing local realism in high energy physics

Qiao

2009

Physics Letters A

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The three photons from the dominant ortho-positronium decay and two vector mesons from the η c exclusive decays are found to be in tripartite and high-dimensional entangled states, respectively. These two classes of entangled states possess the Hardy type nonlocality and allow a priori for quantum mechanics vs local realism test via Bell inequalities. The experimental realizations are shown to be feasible, and a concrete scheme to fulfill the test in experiment via two-vector-meson entangled state is proposed.

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Positron storage ring for positronium and antihydrogen generation in flight: The LEPTA project

Cited by 7 publications

References 17 publications

Positron injector for LEPTA

Positron injector for LEPTA

Development of a high-efficiency pulsed slow positron beam for measurements with orthopositronium in vacuum

New possibilities for testing local realism in high energy physics

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