Developing inductively driven diagnostic X-ray sources to enable transformative radiography and diffraction capabilities on Z

Myers, Clayton Edward; Gomez, Matthew R.; Lamppa, Derek C.; Webb, Timothy Jay; Yager-Elorriaga, David Alexander; Hutsel, Brian Thomas; Jennings, Christopher Ashley; Knapp, Patrick F.; Kossow, Michael Richard; Lucero, Larry Martin; Obregon, Robert J.; Steiner, Adam Michael; Ampleford, David J.; Sinars, Daniel B.

doi:10.2172/1747000

Developing inductively driven diagnostic X-ray sources to enable transformative radiography and diffraction capabilities on Z

Technical Report · Tue Sep 01 00:00:00 EDT 2020

DOI:https://doi.org/10.2172/1747000· OSTI ID:1747000

Myers, Clayton Edward ^[1]; Gomez, Matthew R. ^[1]; Lamppa, Derek C. ^[1]; Webb, Timothy Jay ^[1]; Yager-Elorriaga, David Alexander ^[1]; Hutsel, Brian Thomas ^[1]; Jennings, Christopher Ashley ^[1]; Knapp, Patrick F. ^[1]; Kossow, Michael Richard ^[1]; Lucero, Larry Martin ^[1]; Obregon, Robert J. ^[1]; Steiner, Adam Michael ^[1]; Ampleford, David J. ^[1]; Sinars, Daniel B. ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Penetrating X-rays are one of the most effective tools for diagnosing high energy density experiments, whether through radiographic imaging or X-ray diffraction. To expand the X-ray diagnostic capabilities at the 26-MA Z Pulsed Power Facility, we have developed a new diagnostic X-ray source called the inductively driven X-pinch (IDXP). This X-ray source is powered by a miniature transmission line that is inductively coupled to fringe magnetic fields in the final power feed. The transmission line redirects a small amount of Zs magnetic energy into a secondary cavity where 150+ kA of current is delivered to a hybrid X-pinch. In this report, we describe the multi-stage development of the IDXP concept through experiments both on Z and in a surrogate setup on the 1 MA Mykonos facility. Initial short-circuit experiments to verify power ow on Z are followed by short-circuit and X-ray source development experiments on Mykonos. The creation of a radiography-quality X-pinch hot spot is verified through a combination of X-ray diode traces, laser shadowgraphy, and source radiography. The success of the IDXP experiments on Mykonos has resulted in the design and fabrication of an IDXP for an upcoming Z experiment that will be the first-ever X-pinch fielded on Z. We have also pursued the development of two additional technologies. First, the extended convolute post (XCP) has been developed as an alternate method for powering diagnostic X-pinches on Z. This concept, which directly couples the current owing in one of the twelve Z convolute posts to an X-pinch, greatly increases the amount of available current relative to an IDXP (900 kA versus 150 kA). Initial short-circuit XCP experiments have demonstrated the efficacy of power ow in this geometry. The second technology pursued here is the inductively driven transmission line (IDTL) current monitor. These low-current IDTLs seek to measure the current in the final power feed with high fidelity. After three generations of development, IDTL current monitors frequently return cleaner current measurements than the standard B-dot sensors that are fielded on Z. This is especially true on high-inductance experiments where the harshest conditions are created in the nal power feed.

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Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program

DOE Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1747000

Report Number(s):: SAND--2020-13876; 693064

Country of Publication:: United States

Language:: English

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