Lithium Ion Emitter for Low Energy Beam Experiments

Heinz, O.; Reaves, R. T.

doi:10.1063/1.1683639

Cited by 84 publications

(10 citation statements)

References 3 publications

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“…The construction and performance of these cells has been disclosed elsewhere. 22 We also tested our system with pure 6 Li and 7 Li cells. The Pierce voltage V p determines the ion-beam energy.…”

Section: B Isotope Separation Apparatusmentioning

confidence: 99%

Lithium isotope separation with tunable diode lasers

Olivares

Duarte²,

Saravia³

et al. 2002

Appl. Opt.

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A laser-isotope-separation study of lithium has been performed with two-step excitation involving UV laser radiation and a visible tunable-diode laser. The method yields a high degree of selectivity by tuning the narrow-linewidth diode laser to the D1 or D2 levels of the lithium atom. Selective laser excitation is simplified by the use of the tunable diode laser and the overall approach benefits from the application of a compact mass selector that includes a precision magnetic sector and an ion beam that is designed specifically for light atoms such as lithium.

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Section: B Isotope Separation Apparatusmentioning

confidence: 99%

Lithium isotope separation with tunable diode lasers

Olivares

Duarte²,

Saravia³

et al. 2002

Appl. Opt.

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“…For a transverse beam view this sets stringent limits on beam divergence and monoenergeticity. The existence of effective thermo-emissive lithium ion sources based on aluminosilicates [9,10] permits the creation of high brightness, single isotope beams having a fraction of the energy spread of plasma discharge type sources. In addition, the extremely high efficiency for charge transfer for lithium on sodium vapor allows us to obtain ~90% neutralization efficiency within a very short neutralization distance.…”

Section: Monoenergetic Beam Formation and Neutralizationmentioning

confidence: 99%

Lithium Polarization Spectroscopy: Making Precision Plasma Current Measurements in the DIII-D National Fusion Facility

Thomas

2007

AIP Conference Proceedings

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Due to several favorable atomic properties (including a simple spectral structure, the existence of a visible resonance line, large excitation cross section, and ease of beam formation), beams of atomic lithium have been used for many years to diagnose various plasma parameters. Using techniques of active (beam-based) spectroscopy, lithium beams can provide localized measurements of plasma density, ion temperature and impurity concentration, plasma fluctuations, and intrinsic magnetic fields. In this paper we present recent results on polarization spectroscopy from the LIBEAM diagnostic, a 30 keV, multi-mA lithium beam system deployed on the DIII-D National Fusion Facility tokamak. In particular, by utilizing the Zeeman splitting and known polarization characteristics of the collisionally excited 670.8 nm Li resonance line we are able to measure accurately the spatio-temporal dependence of the edge current density, a parameter of basic importance to the stability of high performance tokamaks. We discuss the basic atomic beam performance, spectral lineshape filtering, and polarization analysis requirements that were necessary to attain such measurements. Observations made under a variety of plasma conditions have demonstrated the close relationship between the edge current and plasma pressure, as expected from neoclassical theory.

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“…Much effort went into determining the proper substrate, as the unusually anisotropic thermal expansion coefficient for _-euctyptite made adhesion difficult. After many tests a good choice was found to be sintered tungsten sponges [19] and a number of these discs were procured and coated. The ion emission level is easily regulated by controlled heating of the source.…”

Section: Ion Sourceand Beam Developmentmentioning

confidence: 99%

An edge density fluctuation diagnostic for DIII-D using lithium beams. Final report, March 15, 1990--September 15, 1993

Thomas¹

1994

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ISTRtBUTION OF THIS DOCUMENT IS UNLIMITED DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibilityfor the accuracy, completeness, or usefulness of any information, apparatus, product, nr process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwlse, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or _ny agency thereof. The views and opinions of authors expressed herein do not necez_arily state or reflectthose of the United States Government or any agency thereof. This report has been reproduced directly from the best available copy.

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Lithium Ion Emitter for Low Energy Beam Experiments

Cited by 84 publications

References 3 publications

Lithium isotope separation with tunable diode lasers

Lithium isotope separation with tunable diode lasers

Lithium Polarization Spectroscopy: Making Precision Plasma Current Measurements in the DIII-D National Fusion Facility

An edge density fluctuation diagnostic for DIII-D using lithium beams. Final report, March 15, 1990--September 15, 1993

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