Analysis Procedures for Double-Shell Target Concentricity and Wall Thickness

Sain, J D ; Brown, W D ; Martz, H E ; Schneberk, D J

Lawrence Livermore National Laboratory

关键词: Computerized Tomography;    Lawrence Livermore National Laboratory;    Spacers;    Air;    Thickness;   

DOI  :  10.2172/889447
RP-ID  :  UCRL-TR-220178
RP-ID  :  W-7405-ENG-48
RP-ID  :  889447

美国|英语

来源: UNT Digital Library

【 摘 要 】

The LLNL Target Fabrication Team (TFT) asked the Center for Non-Destructive Characterization (CNDC) to use CNDC's KCAT or Xradia's Micro computed tomography (CT) system to collect three-dimensional (3D) tomographic data of a set of double-shell targets and determine, among other items, the following: (1) the concentricity of the outer surface of the inner shell with respect to the inner surface of the outer shell with an accuracy of 1-2 micrometers, and (2) the wall thickness uniformity of the outer shell with an accuracy of 1-2 micrometers. The CNDC used Xradia's Micro CT system to collect the data. Bill Brown performed the concentricity analysis, and John Sain performed the wall thickness uniformity analysis. Harry Martz provided theoretical guidance, and Dan Schneberk contributed technical (software) support. This document outlines the analysis procedures used in each case. The double-shell targets, as shown in Figures 1 and 2, consist of an inner shell (or capsule), a two-piece spherical aerogel intermediary shell, and a two-piece spherical outer shell. The three elements are designed and fabricated to be concentric--with the aerogel shell acting as a spacer between the inner shell and outer shell--with no to minimum air gaps in the final assembly. The outer diameters of the aerogel and outer shells are 444 and 550 micrometers, respectively, so the wall thickness of the outer shell is 53 micrometers.