BOULDER, Colo., July 18, 2013 /PRNewswire/ -- The Ball Aerospace & Technologies Corp. cryogenic flight electronic boxes recently shipped to NASA Goddard Space Flight Center and Northrop Grumman Aerospace Systems for the James Webb Space Telescope are unlike any previously designed and manufactured.
"Nothing was typical about this innovative solution," said Robert D. Strain, Ball Aerospace president. "To our knowledge, we are the only company that has ever created these kinds of electronics for a space telescope, and we're proud of the ingenuity at Ball that enabled this breakthrough."Electronics on a spacecraft are usually kept warm, operating over a temperature range from ‑4 degrees F to 131 degrees F. The Webb electronics are collocated with each of the telescope's 18 hexagonal cold primary mirror segments and therefore must be operated at the same temperature as the primary mirror segments. These temperatures are as low as ‑405 degrees F (30K) in order to capture some of the earliest infrared light in the cosmos. Ball, a principal subcontractor to Northrop Grumman Aerospace Systems, successfully undertook the challenge to design the Webb electronics to operate in a deep-freeze cryogenic environment, recognizing that existing components had yet to be proven for such a space mission and therefore a "how-to" manual was not available. To create the 6.5-meter Webb aperture, the mirror segments must be aligned on orbit, requiring that a set of cryogenic actuators be mounted to each segment to control individual mirror positioning and curvature radius within one ten-thousandth the width of a human hair. To do that, all 132 actuators required multiple wires to carry power and instrumentation signals between the actuators and control electronics. To meet all of these complex requirements, Ball located, tested and qualified off-the-shelf components for use in both a 30K cryogenic and a radiation environment to create a unique electronics architecture consisting of 22 cryogenic flight electronics boxes. Each box operates between 30K and room temperature to multiplex signals from the warm control electronics to one actuator at a time. Achieving this critical technological advancement for future spacecraft to explore the solar system also required:
- Determining how to create a multiplex design essential to minimize wiring and reduce the thermal heat leak from the warm control electronics to the passively cooled region of the telescope
- Reducing the mass of electronic cables by nearly 98 percent to effectively reduce overall mass of the spacecraft, and
- Developing robust manufacturing processes to allow the boards to survive both launch loads and multiple thermal cycles from room temperature down to 30K.