Measuring the density of a molecular cluster injector via visible emission from an electron beam

D. P. Lundberg; R. Kaita; R. Majeski; D. P. Stotler

doi:10.1063/1.3464473

Measuring the density of a molecular cluster injector via visible emission from an electron beam

D. P. Lundberg, R. Kaita, R. Majeski, D. P. Stotler

PPPL Tokamak Expermntl Science

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Abstract

A method to measure the density distribution of a dense hydrogen gas jet is presented. A Mach 5.5 nozzle is cooled to 80 K to form a flow capable of molecular cluster formation. A 250 V, 10 mA electron beam collides with the jet and produces H_α emission that is viewed by a fast camera. The high density of the jet, several 10¹⁶ cm^-3, results in substantial electron depletion, which attenuates the H_α emission. The attenuated emission measurement, combined with a simplified electron-molecule collision model, allows us to determine the molecular density profile via a simple iterative calculation.

Original language	English (US)
Article number	10D707
Journal	Review of Scientific Instruments
Volume	81
Issue number	10
DOIs	https://doi.org/10.1063/1.3464473
State	Published - Oct 2010

All Science Journal Classification (ASJC) codes

Instrumentation

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10.1063/1.3464473

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abstract = "A method to measure the density distribution of a dense hydrogen gas jet is presented. A Mach 5.5 nozzle is cooled to 80 K to form a flow capable of molecular cluster formation. A 250 V, 10 mA electron beam collides with the jet and produces Hα emission that is viewed by a fast camera. The high density of the jet, several 1016 cm-3, results in substantial electron depletion, which attenuates the Hα emission. The attenuated emission measurement, combined with a simplified electron-molecule collision model, allows us to determine the molecular density profile via a simple iterative calculation.",

author = "Lundberg, \{D. P.\} and R. Kaita and R. Majeski and Stotler, \{D. P.\}",

year = "2010",

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AU - Lundberg, D. P.

AU - Kaita, R.

AU - Majeski, R.

AU - Stotler, D. P.

PY - 2010/10

Y1 - 2010/10

N2 - A method to measure the density distribution of a dense hydrogen gas jet is presented. A Mach 5.5 nozzle is cooled to 80 K to form a flow capable of molecular cluster formation. A 250 V, 10 mA electron beam collides with the jet and produces Hα emission that is viewed by a fast camera. The high density of the jet, several 1016 cm-3, results in substantial electron depletion, which attenuates the Hα emission. The attenuated emission measurement, combined with a simplified electron-molecule collision model, allows us to determine the molecular density profile via a simple iterative calculation.

AB - A method to measure the density distribution of a dense hydrogen gas jet is presented. A Mach 5.5 nozzle is cooled to 80 K to form a flow capable of molecular cluster formation. A 250 V, 10 mA electron beam collides with the jet and produces Hα emission that is viewed by a fast camera. The high density of the jet, several 1016 cm-3, results in substantial electron depletion, which attenuates the Hα emission. The attenuated emission measurement, combined with a simplified electron-molecule collision model, allows us to determine the molecular density profile via a simple iterative calculation.

UR - https://www.scopus.com/pages/publications/78149421271

UR - https://www.scopus.com/inward/citedby.url?scp=78149421271&partnerID=8YFLogxK

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JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 10

M1 - 10D707

ER -

Measuring the density of a molecular cluster injector via visible emission from an electron beam

Abstract

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