Tom Greene has been helping with the cryogenic testing of the James Webb Space Telescope (JWST) Near-infrared camera (NIRCam) flight instrument at the Lockheed Martin Advanced Technology Center in Palo Alto since June 28.
He is working with the NIRCam PI (M. Rieke), her University of Arizona team, the Space Telescope Science Institute, Ball Aerospace, NASA Goddard Space Flight Center, and Lockheed Martin Personnel in conducting and analyzing tests to assess its performance. Both NIRCam modules are working well (optics, mechanisms, detectors), but testing has been progressing very slowly due to problems with the non-cryogenic telescope simulator ground support equipment. There is one significant issue with NIRCam itself in the form of a serious light leak in the long wave (2.5 - 5 microns wavelength) arms. This is likely due to the omission of about 25mm of indium from the baffle seal. This will be rectified before the second cryogenic test cycle that will start next month.