Parallel energy analyzer for pure electron plasma devices

Eggleston, D. L.; Driscoll, C. F.; Beck, Belinda R.; Hyatt, A.W.; Malmberg, J. H.

doi:10.1063/1.860399

Cited by 115 publications

(92 citation statements)

References 18 publications

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“…The p plasma temperature after adiabatic cooling is revealed [20] by the first few thousand p that escape (too few to modify T) as W 0 is reduced linearly at 2:2 eV=s to the value at which p escape, at a W 0 that corresponds to f f . Thermal energy allows the initial p to escape over the potential barrier, alongẑ to the left in Figs.…”

Section: Prl 106 073002 (2011) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 99%

Adiabatic Cooling of Antiprotons

et al. 2011

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Section: Prl 106 073002 (2011) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 99%

Adiabatic Cooling of Antiprotons

et al. 2011

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“…Following [118], ALPHA can measure the parallel temperature of the particle cloud or plasma by slowly lowering the confining potential and fitting the distribution of escaping particles. Since the particles are released on-axis, their energies should follow a onedimensional Maxwell-Boltzmann distribution:…”

Section: Charged Particle Temperature Measurementmentioning

confidence: 99%

Detection of Trapped Antihydrogen

Hydomako

2013

Springer Theses

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The ALPHA experiment is an international effort to produce, trap, and perform precision spectroscopic measurements on antihydrogen (the bound state of a positron and an antiproton). Based at the Antiproton Decelerator (AD) facility at CERN, the ALPHA experiment has recently magnetically confined antihydrogen atoms for the first time. A crucial element in the observation of trapped antihydrogen is ALPHA's silicon vertexing detector. This detector contains sixty silicon modules arranged in three concentric layers, and is able to determine the three-dimensional location of the annihilation of an antihydrogen atom by reconstructing the trajectories of the produced annihilation products.This dissertation focuses mainly on the methods used to reconstruct the annihilation location. Specifically, the software algorithms used to identify and extrapolate charged particle tracks are presented along with the routines used to estimate the annihilation location from the convergence of the identified tracks. It is shown that these methods can determine the annihilation location with a spatial resolution between about 0.6 to 0.8 cm (depending on the coordinate being measured). Furthermore, a robust analysis to identify and reduce cosmic ray background events is described. The cosmic ray background can obscure the trapped antihydrogen signal, and its suppression leads to a significant increase in the annihilation detection sensitivity. The background suppression analysis involves examining the reconstructed detector event based on several selection criteria, including: the number of charged particle tracks, the radial vertex position, and a fit of a straight line to the event hit positions. By carefully optimizing these criteria, (99.54 ± 0.02)% of cosmic ray events are rejected, while (64.4 ± 0.1)% of antihydrogen annihilation events are retained. Finally, the experimental results demonstrating the first-ever magnetic confinement of antihydrogen atoms are presented. These results rely heavily on the silicon i detector, and as such, the role of the annihilation vertex reconstruction is emphasized.

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“…19 On EV, the perpendicular temperature T Ќ can also be measured using a ''magnetic beach'' analyzer. In general, we find T ʈ ϷT Ќ ϵT p , since the electron-electron collision rate Ќʈ Ϸ100 s Ϫ1 is relatively rapid.…”

Section: Experimental Apparatusesmentioning

confidence: 99%

Thermally excited Trivelpiece–Gould modes as a pure electron plasma temperature diagnostic

et al. 2003

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Thermally excited plasma modes are observed in trapped, near-thermal-equilibrium pure electron plasmas over a temperature range of 0.05ϽkTϽ5 eV. The modes are excited and damped by thermal fluctuations in both the plasma and the receiver electronics. The thermal emission spectra together with a plasma-antenna coupling coefficient calibration uniquely determine the plasma ͑and load͒ temperature. This calibration is obtained from the mode spectra themselves when the receiver-generated noise absorption is measurable; or from separate wave reflection/absorption measurements; or from kinetic theory. This nondestructive temperature diagnostic agrees well with standard diagnostics, and may be useful for expensive species such as antimatter.

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Parallel energy analyzer for pure electron plasma devices

Cited by 115 publications

References 18 publications

Adiabatic Cooling of Antiprotons

Adiabatic Cooling of Antiprotons

Detection of Trapped Antihydrogen

Thermally excited Trivelpiece–Gould modes as a pure electron plasma temperature diagnostic

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