Title: Multi frame synchrotron radiography of pulsed power driven underwater single wire explosions

Abstract

We present herein the first use of synchrotron-based phase contrast radiography to study pulsed-power driven high energy density physics experiments. Underwater electrical wire explosions have become of interest to the wider physics community due to their ability to study material properties at extreme conditions and efficiently couple stored electrical energy into intense shock waves in water. The latter can be shaped to provide convergent implosions, resulting in very high pressures (1-10 Mbar) produced on relatively small pulsed power facilities (100s of kA-MA). Multiple experiments have explored single-wire explosions in water, hoping to understand the underlying physics and better optimize this energy transfer process; however, diagnostics can be limited. Optical imaging diagnostics are usually obscured by the shock wave itself; and until now, diode-based X-ray radiography has been of relatively low resolution and rather a broad x-ray energy spectrum. Utilising phase contrast imaging capabilities of the ID19 beamline at the European Synchrotron Radiation Facility, we were able to image both the exploding wire and the shock wave. Probing radiation of 20-50 keV radiographed 200 μm tungsten and copper wires, in ~2-cm diameter water cylinders with resolutions of 8 μm and 32 μm. The wires were exploded by a ~30-kA, 500-ns compactmore » pulser, and 128 radiographs, each with a 100-ps X-ray pulse exposure, spaced at 704 ns apart were taken in each experiment. Abel inversion was used to obtain the density profile of the wires, and the results are compared to two dimensional hydrodynamic and one dimensional magnetohydrodynamic simulations.« less

Authors:

Yanuka, D. ^[1]; Rososhek, A.  ^[2];

• Search OSTI.GOV for author "Rososhek, A."
• Search OSTI.GOV for ORCID "0000-0001-8193-6449"
• Search orcid.org for ORCID "0000-0001-8193-6449"

Theocharous, S. ^[1]; Bland, S. N.  ^[1];

• Search OSTI.GOV for author "Bland, S. N."
• Search OSTI.GOV for ORCID "0000-0002-0087-3923"
• Search orcid.org for ORCID "0000-0002-0087-3923"

Krasik, Ya. E.  ^[2];

• Search OSTI.GOV for author "Krasik, Ya. E."
• Search OSTI.GOV for ORCID "0000-0003-2288-3732"
• Search orcid.org for ORCID "0000-0003-2288-3732"

Olbinado, M. P. ^[3]; Rack, A.  ^[3]

• Search OSTI.GOV for author "Rack, A."
• Search OSTI.GOV for ORCID "0000-0001-9486-3621"
• Search orcid.org for ORCID "0000-0001-9486-3621"

---

+ Show Author Affiliations

1. Imperial College, London (United Kingdom)
2. Technion - Israel Inst. of Technology, Haifa (Israel)
3. European Synchrotron Radiation Facility (ESRF), Grenoble (France)

Publication Date:

2018-10-17

Research Org.:

Cornell Univ., Ithaca, NY (United States)

Sponsoring Org.:

USDOE National Nuclear Security Administration (NNSA); Engineering and Physical Sciences Research Council (EPSRC)

OSTI Identifier:

1614419

Alternate Identifier(s):

OSTI ID: 1477905

Grant/Contract Number:  

NA0003764; SC0018088; NA0003764,SC0018088

Resource Type:

Journal Article: Accepted Manuscript

Journal Name:

Journal of Applied Physics

Additional Journal Information:

Journal Volume: 124; Journal Issue: 15; Journal ID: ISSN 0021-8979

Publisher:

American Institute of Physics (AIP)

Country of Publication:

United States

Language:

English

Subject:

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Physics; Synchrotrons; Integral transforms; Electrical energy; Hydrodynamics simulations; Shock waves; Exploding wire method; Radiography