GLIDER—A pulsed-current generator for laboratory astrophysics x-ray absorption experiments

Gissis, I.; Behar, E.; Fisher, A.; Aricha, S.; Yeger, E.; Avni, U.; Schnitzer, I.

doi:10.1063/1.5133056

Cited by 4 publications

(3 citation statements)

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“…The experimental setup is depicted in Figure 1. A gaspuff Z-pinch plasma X-ray source is produced using the GLIDER generator [15]. The Z-pinch source is optimized for absorption measurements of the CNO K-shell spectral range (20 -50 Å) by using imploding Kr gas.…”

Section: Experimental Setup and Methodologymentioning

confidence: 99%

“…However, table-top LPPs require hundreds of shots to obtain a single high SNR spectrum. We have developed the GLIDER [15], a compact pulsedpower X-ray source of ∼10 17 erg s −1 , which enables the measurement of NEXAFS of any matter-phase in an individual ∼10 ns shot and dozens of shots per hour. In this paper, we report on NEXAFS diagnostics of astrophysical molecules found in GMCs.…”

Section: A Laboratory Molecular Absorptionmentioning

confidence: 99%

“…The preceding UV pulse is also short, ∼30 ns. The dissociation time t diss = (F σ) −1 , where F = 10 23 ph s −1 cm −2 is the measured photon flux above 10 eV [15]. The cross-section is σ = 10 −18 −10 −16 cm 2 varying over the spectral band [23], which results in t diss = 0.1 − 10 µs.…”

Section: A Column Density Measurementsmentioning

confidence: 99%

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X-ray absorption of cold gas: Simulating interstellar molecular clouds in the laboratory

Gissis,

Fisher,

Behar

2021

Preprint

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Galactic and extra-galactic sources produce X-rays that are often absorbed by molecules and atoms in giant molecular clouds (GMCs), which provides valuable information about their composition and physical state. We mimic this phenomenon with a laboratory Z-pinch X-ray source, which is impinged on neutral molecular gas. The novel technique produces a soft X-ray pseudo continuum using a pulsed-current generator. The absorbing gas is injected from a 1 cm long planar gas-puff without any window or vessel along the line of sight. An X-ray spectrometer with a resolving power of λ/∆λ ∼420, comparable to that of astrophysical space instruments, records the absorbed spectra. This resolution clearly resolves the molecular lines from the atomic lines; therefore, motivating the search of molecular signature in astrophysical X-ray spectra. The experimental setup enables different gas compositions and column densities. K-shell spectra of CO2, N2 and O2 reveal a plethora of absorption lines and photo-electric edges measured at molecular column densities between ∼10 16 cm −2 -10 18 cm −2 typical of GMCs. We find that the population of excited-states, contributing to the edge, increases with gas density.

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Section: Experimental Setup and Methodologymentioning

confidence: 99%

Section: A Laboratory Molecular Absorptionmentioning

confidence: 99%