High efficiency positron moderation a feasibility study of the slow beam confinement extraction

Gerola, D.; Waeber, W.B.; Shi, M.

doi:10.1016/0168-9002(95)00392-4

Cited by 6 publications

(7 citation statements)

References 10 publications

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“…2. The sources for this experiment were 48 V created by irradiation of 1 µm Ti foils exploiting the reaction 48 Ti(p,n) 48 V with 8 MeV protons from the ETHZ TANDEM accelerator and with 18 MeV protons using the external beam line of the IBA 18/9 medical cyclotron located at the Inselspital in Bern, Switzerland [49].…”

Section: Methodsmentioning

confidence: 99%

“…However, developments are underway that should allow one to achieve 10 MBq activities of the foils in less than 1 day irradiation using solid target stations usually employed for the production of radioisotopes with medical cyclotrons. Therefore, 48 V is interesting for targeted measurements. For long term operation, better choices for the β + emitter are 58 Co or 22 Na with half-lives of 70 days and 2.6 years respectively.…”

Section: Methodsmentioning

confidence: 99%

“…W. B. Waeber et al [46] tried to implement the same approach for degrading positrons to energies of a few keV before their extraction and subsequent moderation outside the CT to form a mono-energetic beam. However, due to their very challenging extraction scheme they could not reach the very promising theoretical predictions and this project was discontinued [47,48].…”

Section: Principle Of the Cyclotron Trap Assisted Moderationmentioning

confidence: 99%

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High Efficiency Cyclotron Trap Assisted Positron Moderator

et al. 2018

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We report the realisation of a cyclotron trap assisted positron tungsten moderator for the conversion of positrons with a broad keV-few MeV energy spectrum to a mono-energetic eV beam with an efficiency of 1.8(2) % defined as the ratio of the slow positrons divided by the β + activity of the radioactive source. This is an improvement of almost two orders of magnitude compared to the state of the art of tungsten moderators. The simulation validated with this measurement suggests that using an optimised setup even higher efficiencies are achievable.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Principle Of the Cyclotron Trap Assisted Moderationmentioning

confidence: 99%

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High Efficiency Cyclotron Trap Assisted Positron Moderator

et al. 2018

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“…2014). Particle collisions with the target are assumed to lead to loss, a pessimistic assumption as not all scattering will lead to loss (in fact, this would likely moderate the particles to lower energy, making them easier to trap (Mills 1980; Gerola, Waeber & Shi 1995; Gerchow et al. 2018)).…”

Section: Laser-produced Electron–positron Plasmasmentioning

confidence: 99%

“…Losses through the mirror ends are due to particles moving non-adiabatically through phase space into the loss cone (Porazik et al 2014). Particle collisions with the target are assumed to lead to loss, a pessimistic assumption as not all scattering will lead to loss (in fact, this would likely moderate the particles to lower energy, making them easier to trap (Mills 1980;Gerola, Waeber & Shi 1995;Gerchow et al 2018)). The confinement time is of the order of 1 ns, which is approximately 10 bounce periods (figure 7b).…”

Section: Magnetic Confinement Of Laser-produced Pairsmentioning

confidence: 99%

A new frontier in laboratory physics: magnetized electron–positron plasmas

et al. 2020

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We describe here efforts to create and study magnetized electron–positron pair plasmas, the existence of which in astrophysical environments is well-established. Laboratory incarnations of such systems are becoming ever more possible due to novel approaches and techniques in plasma, beam and laser physics. Traditional magnetized plasmas studied to date, both in nature and in the laboratory, exhibit a host of different wave types, many of which are generically unstable and evolve into turbulence or violent instabilities. This complexity and the instability of these waves stem to a large degree from the difference in mass between the positively and the negatively charged species: the ions and the electrons. The mass symmetry of pair plasmas, on the other hand, results in unique behaviour, a topic that has been intensively studied theoretically and numerically for decades, but experimental studies are still in the early stages of development. A levitated dipole device is now under construction to study magnetized low-energy, short-Debye-length electron–positron plasmas; this experiment, as well as a stellarator device that is in the planning stage, will be fuelled by a reactor-based positron source and make use of state-of-the-art positron cooling and storage techniques. Relativistic pair plasmas with very different parameters will be created using pair production resulting from intense laser–matter interactions and will be confined in a high-field mirror configuration. We highlight the differences between and similarities among these approaches, and discuss the unique physics insights that can be gained by these studies.

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Optimization of a device for positron moderation based on a magnetic bottle

Djourelov

Şerban

2021

Nuclear Instruments and Methods in Physics Research Section A:

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High efficiency positron moderation a feasibility study of the slow beam confinement extraction

Cited by 6 publications

References 10 publications

High Efficiency Cyclotron Trap Assisted Positron Moderator

High Efficiency Cyclotron Trap Assisted Positron Moderator

A new frontier in laboratory physics: magnetized electron–positron plasmas

Optimization of a device for positron moderation based on a magnetic bottle

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