Simulations of slow positron production using a low-energy electron accelerator

O’Rourke, Brian; Hayashizaki, Noriyosu; Kinomura, A.; Kuroda, R.; Minehara, Eisuke; Ohdaira, Toshiyuki; Oshima, Nobuyuki; Suzuki, Ryoichi

doi:10.1063/1.3599156

“…Several facilities of this type are currently in operation around the world with electron energies from about 15 MeV to 1.3 GeV (Jungmann et al, 2013;Krause-Rehberg et al, 2008;O'Rourke et al, 2011;Wada et al, 2012;Wang et al, 2008). It is also possible to obtain useful positron output using more modest electron accelerators.…”

Section: Electron Acceleratorsmentioning

confidence: 99%

Plasma and trap-based techniques for science with positrons

Danielson¹,

Dubin²,

Greaves³

et al. 2015

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In recent years, there has been a wealth of new science involving low-energy antimatter (i.e., positrons and antiprotons) at energies ranging from 10 2 to less than 10 −3 eV. Much of this progress has been driven by the development of new plasma-based techniques to accumulate, manipulate and deliver antiparticles for specific applications. This article focuses on the advances made in this area using positrons. However many of the resulting techniques are relevant to antiprotons as well. An overview is presented of relevant theory of single-component plasmas in electromagnetic traps. Methods are described to produce intense sources of positrons and to efficiently slow the typically energetic particles thus produced. Techniques are described to trap positrons efficiently and to cool and compress the resulting positron gases and plasmas. Finally, the procedures developed to deliver tailored pulses and beams (e.g., in intense, short bursts, or as quasi-monoenergetic continuous beams) for specific applications are reviewed. The status of development in specific application areas is also reviewed. One example is the formation of antihydrogen atoms for fundamental physics [e.g., tests of invariance under charge conjugation, parity inversion and time reversal (the CPT theorem), and studies of the interaction of gravity with antimatter]. Other applications discussed include atomic and materials physics studies and study of the electron-positron many-body system, including both classical electron-positron plasmas and the complementary quantum system in the form of Bose-condensed gases of positronium atoms. Areas of future promise are also discussed. The review concludes with a brief summary and a list of outstanding challenges.

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“…The AMD magnetic field strength decreased from 1 Tl to 0.08 Tl over 75 cm length. The field decreases in accordance with (14), the parameter α = 0.13.…”

Section: Numerical Simulationsmentioning

confidence: 79%

“…The moderator efficiency (ratio of the 'slow' positrons fraction to the total number of them) substantially reduces with increase of the energy of initial positrons and reaches ∼ 10 −5 at the energy of a few MeV, [14]. One of effective methods to reduce the energy of the income to the moderator positrons was proposed in ANL, [15].…”

Section: Computing On the Positron Sourcementioning

confidence: 99%

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KIPT Positron Source Project. Conceptual Design

Perezhogin¹,

Bulyak²,

Dovbnya³

et al. 2018

Preprint

0

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We present the results of theoretical and numerical studies on the source of slow positrons for NSC KIPT. The positrons are intended to generate with the electrons of 9, 40 or 90 MeV available at the KIPT electron linacs. The yield of positrons from the conversion target is estimated as well as their spatial-angular characteristics. Optimal parameters of the conversion target for each energy of electrons are estimated. Preliminary design of the positron beam formation system is also presented. Qualitative analytical dependencies of the positron beam parameters at the system exit upon the amplitude and the decrease factor of the magnetic field in the Adiabatic Matching Device (AMD) solenoid have been established. These dependencies have been used for system optimization. Numerical simulations allow to optimize the parameters of AMD for solenoid available in the laboratory. Possible application of the subharmonic RF cavity for reduction of the energy of positrons has also been estimated and validated by the simulations. As it has been shown, this cavity can substantially decrease the positron energy and thus facilitate operation of the moderator.

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“…The simulations have been aimed at clarification the production and transport of the low-energy positrons. In addition, we considered moderation (slowing down) of such positrons, implying that the yield of positrons from a moderator is inversely proportional to their energy [21].…”

Section: Numerical Simulationsmentioning

confidence: 99%

NSC Kipt Positron Source. Pre-Project Research

Bulyak¹,

Dovbnya²,

Kushnir³

et al. 2020

Problems of Atomic Science and Technology

0

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We present the results of theoretical and numerical studies on the source of slow positrons for NSC KIPT. The positrons are intended to generate with the electrons of 9, 40 or 90 MeV available at the KIPT electron linacs. The yield of positrons from the conversion target is estimated as well as their spatial-angular characteristics. Optimal parameters of the conversion target for each energy of electrons are estimated. Preliminary design of the positron beam formation system is also presented. Qualitative analytical dependencies of the positron beam parameters at the system exit upon the amplitude and the decrease factor of the magnetic field in the Adiabatic Matching Device (AMD) solenoid have been established. These dependencies have been used for system optimization. Numerical simulations allow to optimize the parameters of AMD for solenoid available in the laboratory. Possible application of the subharmonic RF cavity for reduction of the energy of positrons has also been estimated and validated by the simulations. As it has been shown, this cavity can substantially decrease the positron energy and thus facilitate operation of the moderator.

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Simulations of slow positron production using a low-energy electron accelerator

Cited by 17 publications

References 35 publications

Plasma and trap-based techniques for science with positrons

Plasma and trap-based techniques for science with positrons

KIPT Positron Source Project. Conceptual Design

NSC Kipt Positron Source. Pre-Project Research

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