Enhanced Dual Confocal Measurement System

Journal Article · Wed Nov 29 00:00:00 EST 2017 · Fusion Science and Technology

DOI:https://doi.org/10.1080/15361055.2017.1387449· OSTI ID:1469641

Tomlinson, K. ^[1]; Seagle, C. T. ^[2]; Huang, H. ^[1]; Smith, G. E. ^[1]; Taylor, J. L. ^[1]; Paguio, R. R. ^[1]

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1. General Atomics, San Diego, CA (United States)
2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

A measurement instrument utilizing dual, chromatic, confocal, distance sensors has been jointly developed by General Atomics (GA) and Sandia National Laboratories (SNL) for thickness and flatness measurement of target components used in dynamic materials properties (DMP) experiments on the SNL Z-Machine (Z). Compared to previous methods used in production of these types of targets, the tool saves time and yields a 4x reduction in thickness uncertainty which is one of the largest sources of error in equation of state (EOS) measurements critical to supporting the NNSA’s Stockpile Stewardship program and computer modeling of high energy density experiments. It has numerous differences from earlier instruments operating on the dual confocal sensor principle to accommodate DMP components including larger lateral travel, longer working distance, ability to measure flatness in addition to thickness, built-in thickness calibration standards for quickly checking calibration before and after each measurement, and streamlined operation. Thickness and flatness of 0.2mm-3.3mm thick sections of diamond machined copper and aluminum can be measured to “sub-micron” accuracy. Sections up to 6mm thick can be measured with as-yet undermined accuracy. Furthermore, samples must have one surface which is flat to within 300µm, lateral dimensions of no more than 50mm x 50mm, and height less than 40mm.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); General Atomics, San Diego, CA (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA), Office of Defense Science (NA-113)
• Grant/Contract Number: AC04-94AL85000; NA0001808; NA003525
• OSTI ID: 1469641
• Alternate ID(s): OSTI ID: 1402464
• Report Number(s): SAND2018-9580J; 667505
• Journal Information: Fusion Science and Technology, Vol. 73, Issue 2; ISSN 1536-1055
• Publisher: American Nuclear Society
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
36 MATERIALS SCIENCE
Dynamic materials properties
Z-Machine
equation of state