Accession Number:

ADA222340

Title:

Diagnostics for Hydrogen Atoms and Molecules in H-Atom Sources and Beams Using VUV Laser Light

Descriptive Note:

Final technical rept. 1 Sep 1986-31 Dec 1989

Corporate Author:

WAYNE STATE UNIV DETROIT MI

Personal Author(s):

Report Date:

1990-04-24

Pagination or Media Count:

26.0

Abstract:

An H- ion source for high brightness H atoms beams should have the lowest possible internal temperature T, because the beam-power density at a distance scales as 1T. We determine local Temperature inside a discharge with the use of a tunable ArF excimer laser that measures the populations of the lowest four rotational states of H2 by means of 21 resonance enhanced multiphoton ionization REMPI. The number of laser-created ions causes a proportional change of the discharges electrical impedance. A calibration in room temperature H2 without a discharge showed that the REMPI works well. Another objective is to monitor vibrationally excited molecules, H2v, that are believed to be the primary origin of H- within volume-type ion sources. We use the same apparatus and approach, but add a Raman shifter to change the laser wavelengths to those appropriate for 21 REMPI of H2V. Keywords Neutral beam, Ion source diagnostics, Laser diagnostics, REMPI, Particle accelerator components, Physics.

Subject Categories:

  • Lasers and Masers
  • Particle Accelerators

Distribution Statement:

APPROVED FOR PUBLIC RELEASE