title: Spectroscopic determination of the composition of a 50 kV hydrogen diagnostic neutral beam.
abstract: A grating spectrometer with an electron multiplying charge-coupled device camera is used to diagnose a 50 kV, 5 A, 20 ms hydrogen diagnostic neutral beam. The ion source density is determined from Stark broadened Hβemission and the spectrum of Doppler-shifted Hαemission is used to quantify the fraction of ions at full, half, and one-third beam energy under a variety of operating conditions including fueling gas pressure and arc discharge current. Beam current is optimized at low-density conditions in the ion source while the energy fractions are found to be steady over most operating conditions.
authors.affiliation: Department of Physics, University of Wisconsin-Madison, 1150 University Ave., Madison, Wisconsin 53706, USA.
authors.forename: X
authors.initials: X
authors.lastname: Feng
authors.affiliation: Department of Physics, University of Wisconsin-Madison, 1150 University Ave., Madison, Wisconsin 53706, USA.
authors.forename: M D
authors.initials: MD
authors.lastname: Nornberg
authors.affiliation: Wheaton College, Wheaton, Illinois 60187, USA.
authors.forename: D
authors.initials: D
authors.lastname: Craig
authors.affiliation: Department of Physics, University of Wisconsin-Madison, 1150 University Ave., Madison, Wisconsin 53706, USA.
authors.forename: D J
authors.initials: DJ
authors.lastname: Den Hartog
authors.affiliation: Department of Physics, University of Wisconsin-Madison, 1150 University Ave., Madison, Wisconsin 53706, USA.
authors.forename: S P
authors.initials: SP
authors.lastname: Oliva