Principle    Of     Equivalence    Measurement   
Vacuum chamber and bouncer
Robert D. Reasenberg
Harvard-Smithsonian Center for Astrophysics
160 Concord Avenue
Mail Stop 63
Cambridge, MA 02138
(617) 495-7108
(617) 495-7109 (fax)
 James D. Phillips
Harvard-Smithsonian Center for Astrophysics
160 Concord Avenue
Mail Stop 63
Cambridge, MA 02138
(617) 495-7360
(fax) (617) 495-7109


POEM News:
  • Torsion-bar bouncer has been tested and works well.
  • New motor controller tested on ball-bearing slide and the old position sensor. It is much easier to tune and program than the old controller.
  • Granite way for air slide has been delivered, and the air slide cart with air bearings has been assembled around the granite way. (Click "Pictures ..." in navigation bar.)
  • The air slide works.
  • Position sensor installed and tested with new motor controller.
  • Steel tripod to support way is fabricated; delivery expected 16 Jan., 2008.
  • Motor magnet strip and coil installed, and aligned with each other and with the air bearing way.
  • Granite way mounted vertically on tripod.
  • Bouncer energy loss reduced from 30% in one bounce cycle (with ball-bearing slide) to 3.2%, 2.2% of which is due to air resistance (including in bearings), and 1.0% to loss in the bouncer. This will allow less-aggressive motor servo settings, reducing noise.


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