Progress towards a practical multicell positron trap

Danielson, J. R.; Hurst, N. C.; Surko, C. M.

doi:10.1063/1.4796066

Cited by 5 publications

(7 citation statements)

References 29 publications

(47 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is possible to store ≈10 9 positrons or so in a standard accumulator [684,685], and one can also consider building multiple positron traps, either in line, or using an off-axis multi-cell design [686,687]. In any case, high capacity traps will clearly take longer to fill unless they can be associated with an intense positron source.…”

Section: Bose-einstein Condensationmentioning

confidence: 99%

Experimental progress in positronium laser physics

2018

View full text Add to dashboard Cite

Abstract. The field of experimental positronium physics has advanced significantly in the last few decades, with new areas of research driven by the development of techniques for trapping and manipulating positrons using Surko-type buffer gas traps. Large numbers of positrons (typically ≥10 6 ) accumulated in such a device may be ejected all at once, so as to generate an intense pulse. Standard bunching techniques can produce pulses with ns (mm) temporal (spatial) beam profiles. These pulses can be converted into a dilute Ps gas in vacuum with densities on the order of 10 7 cm −3 which can be probed by standard ns pulsed laser systems. This allows for the efficient production of excited Ps states, including long-lived Rydberg states, which in turn facilitates numerous experimental programs, such as precision optical and microwave spectroscopy of Ps, the application of Stark deceleration methods to guide, decelerate and focus Rydberg Ps beams, and studies of the interactions of such beams with other atomic and molecular species. These methods are also applicable to antihydrogen production and spectroscopic studies of energy levels and resonances in positronium ions and molecules. A summary of recent progress in this area will be given, with the objective of providing an overview of the field as it currently exists, and a brief discussion of some future directions.

show abstract

Section: Bose-einstein Condensationmentioning

confidence: 99%

Experimental progress in positronium laser physics

2018

View full text Add to dashboard Cite

show abstract

“…To this end, research is being conducted with the goal of building a high-capacity positron trap. Progress in this effort has necessitated the design and construction of a novel type of particle trap -a high magnetic field multi-cell Penning-Malmberg (PM) trap, in which separate SCPs are stored in parallel in a bank of compact traps that share a common vacuum and superconducting magnet system [16].…”

Section: Introductionmentioning

confidence: 99%

Finite-length, large-amplitude diocotron mode dynamics

Hurst

Danielson

Baker

et al. 2015

AIP Conference Proceedings

Self Cite

View full text Add to dashboard Cite

The m = 1 diocotron mode is an important feature of the dynamics of single-component plasmas confined in Penning-Malmberg traps. Presented here are calculations of the diocotron mode frequency under conditions where the most commonly used approximations are invalid. One important application of the calculation described here is the operation of a multi-cell Penning-Malmberg trap that employs a low-aspect-ratio "master" cell. Measurements of the mode frequency in a prototype device are presented. The predictions of the calculation are in good agreement with the data, even for mode amplitudes approaching the inner radius of the electrodes.

show abstract

“…Presented here are the results of a comprehensive set of experiments with electron plasmas in a prototype multicell Penning-Malmberg trap, with the goal of long-term, high-capacity positron storage. 12,14,15 The major objective of this project was to transfer plasmas from a largediameter master cell into each of four small-diameter storage cells, both coaxial and non-coaxial, and to hold them in the storage cells using RW compression for hours or more. The goal is to do this with minimal particle losses (since antiparticles are difficult to produce) and with plasma space charge potentials ranging up to a kilovolt so as to maximize the storage capacity of the trap.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, for given trap dimensions, N is constrained by the confinement voltage V c applied to the endcap electrodes. Voltages of V c ∼ 1 kV have been implemented successfully, 12,13 but higher voltages can introduce plasma heating and other deleterious effects.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Confinement and manipulation of electron plasmas in a multicell trap

et al. 2019

Self Cite

View full text Add to dashboard Cite

Plasma dynamics and transport are studied experimentally in a multicell Penning-Malmberg trap. The goal is to develop methods for accumulation and long-term confinement of larger numbers of charged particles (e.g., positrons) than is presently possible. In this scheme, the particles constitute non-neutral plasmas which are confined separately in a parallel array of storage cells. Experiments are presented in which pure electron plasmas are transferred from a large-diameter “master cell” trapping region into four smaller, parallel “storage cells,” three of which are offset from the magnetic symmetry axis. The physics of the transfer process, as well as the confinement properties of plasmas in the storage cells, is discussed. We show that plasmas can be transferred into the storage cells and held there for up to a day or more using the rotating wall technique, provided that the plasma radius is sufficiently small compared to that of the cell wall. Experiments regarding the confinement of plasmas with kilovolt space charge are discussed. Recommendations are provided for future efforts with high-capacity multicell traps.

show abstract

Progress towards a practical multicell positron trap

Cited by 5 publications

References 29 publications

Experimental progress in positronium laser physics

Experimental progress in positronium laser physics

Finite-length, large-amplitude diocotron mode dynamics

Confinement and manipulation of electron plasmas in a multicell trap

Contact Info

Product

Resources

About