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Gravity Probe B

Testing Einstein's Universe

WEEKLY HIGHLIGHTS FOR WEEK ENDING 8 OCTOBER 1999:

STANFORD HIGHLIGHT

The magnetometer team has successfully completed functional test of the 4 payload magnetometers and has held the acceptance review for this flight hardware. Team members involved in this work included Sei Chun, Ernie Iufer, Russ Leese, Jim Lockhart, and Dorrene Ross.
The cryogenics team has completed the first set of thermal measurements on the GP-B payload. The configuration for these measurements was as follows: the main liquid helium tank was at a temperature of 4.2 K, there was liquid helium in the gaurd tank, and the well and probe were evacuated. The purpose of these measurements was to help provide a better understanding of unexpected temperatures found in the neck region of probe C. Team members involved in this work included Jim Maddocks, Dave Murray, Mike Taber, and Tom Welsh.

Photo: Probe C (the flight probe)

SPACE VEHICLE HIGHLIGHT
Preliminary tests of the Schenck Trebel Spin Balance Machine were completed prior to its move from LMMS building 104 to temporary storage in LMMS building 156. An 8300 pound weight was successfully spun at 30, 40, and 60 RPM.
Photo: LMMS engineers Dave Martin, Bob Graham, Alan Merrick, Elliot Sonnenshine, and Dennis St.Clair in the spin balance control room with the spin balance table in the background.

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