XRD array, grazing incidence spectrometer, and x-ray imaging camera on PBFA II

Recent proton experiments on Particle Beam Fusion Accelerator II used a 2 μm gold foil cone to characterize the ion beam. Using the ion beam images obtained by viewing beam-induced characteristic line radiation emitted by such foils with time-integrated x-ray pinhole cameras, the beam centroid axial location and azimuthal symmetry have been analyzed for a recent series of target shots. Azimuthal symmetry on the target midplane on individual shots varied from 6% to 29%. Averaged over the entire series of shots, inferred intensities on the target midplane varied by 24% to 37% from quadrant to quadrant. The beam profiles and beam reproducibility are vital to the interpretation of the results of these target experiments.

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Measurement of beam properties and reproducibility on recent PBFA II target shots

Moats

Derzon

Johnson

et al. 1992

Review of Scientific Instruments

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ICF target diagnostics on PBFA II (invited)

Chandler

Aubert

Bailey

et al. 1992

Review of Scientific Instruments

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Particle Beam Fusion Accelerator II is a light-ion fusion accelerator that is presently capable of irradiating a 6-mm-diam sphere with ∼50 kJ of 5.5-MeV protons in ∼15 ns. An array of particle and x-ray diagnostics fielded on proton Inertial Confinement Fusion target experiments quantifies the incident particle beam and the subsequent target response. An overview of the ion and target diagnostic setup and capabilities will be given in the context of recent proton beam experiments aimed at studying soft x-ray emission from foam-filled targets and the hydrodynamic response of exploding-pusher targets. Ion beam diagnostics indicate ∼100 kJ of proton beam energy incident within a 1.2-cm radius of the center of the diode with an azimuthal uniformity which varied between 6% and 29%. Foam-filled target temperatures of 35 eV and closure velocities of 4 cm/μs were measured.

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PBFA II lithium beam characterization from inner-shell x-ray images

Moats

Derzon

Chandler

et al. 1995

Review of Scientific Instruments

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The Particle Beam Fusion Accelerator (PBFA II) is now driving targets with ICF-relevant lithium ion beams. During the most recent lithium beam target series, time-integrated x-ray pinhole cameras viewed the ion-induced inner-shell x-ray fluorescence from the central gold cone target and a titanium-coated strip. Ion beam profiles at a nominal 10 mm radius and fixed azimuthal direction were obtained from images of the Ti K a fluorescence of a Ti-coated AI diagnostic wire. The gold cone gave us beam profiles at a nominal 3 mm radius and at all azimuthal angles from the Au La fluorescence. From these profiles, we obtained the ion beam vertical focus position, fullwidth-at-half-maximum, and the degree of azimuthal uniformity for the lithium target shots. For these initial results, beam steering problems were evident. Azimuthal uniformity was measured from the ion beam footprint on the outer Au ease (predominantly Au L

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XRD array, grazing incidence spectrometer, and x-ray imaging camera on PBFA II

Cited by 4 publications

References 2 publications

Measurement of beam properties and reproducibility on recent PBFA II target shots

Measurement of beam properties and reproducibility on recent PBFA II target shots

ICF target diagnostics on PBFA II (invited)

PBFA II lithium beam characterization from inner-shell x-ray images

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