AVS 45th International Symposium
    Vacuum Technology Division Monday Sessions
       Session VT-MoM

Paper VT-MoM10
Outgassing Measurements of Vacuum Compatible Stepper Motors

Monday, November 2, 1998, 11:20 am, Room 329

Session: Vacuum Gauging, Outgassing and Leak Detection
Presenter: J.W. Weed, Sandia National Laboratories
Authors: J.W. Weed, Sandia National Laboratories
R.S. Goeke, Sandia National Laboratories
J.A. Romero, Sandia National Laboratories
Correspondent: Click to Email
The $1.2B National Ignition Facility is currently being constructed at Lawrence Livermore National Laboratory in California. This high-power laser inertial confinement fusion device consists of 192 beams with large optical components in the vacuum environment. Over 1000 stepper motors will be used to perform automated alignment of the laser beams prior to shots. Gas load and contaminants from stepper motor outgassing can severely impact the performance and operation of the laser. We have measured the time dependent outgassing rate of "vacuum compatible" stepper motors from four different manufacturers. We have also obtained mass spectra of each motor. The results of these measurements will be presented and the impact on component performance will be discussed. Possible improvements to these commercial-off-the-shelf motors will be described. @FootnoteText@ Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy under contract DE-AC04-94AL85000