May 2022
The NRL3 ASIC wire bonded to a QFN-80 lead frame without a lid. The 32 input channels are on the right side of the figure, the power rails on top and bottom, and the digital readout and control on the left side (Credit: Eric Wulf).
November 2023
A vacuum test cryostat (aluminum box on the right), which encloses a 64-strip COSI germanium detector being cooled by liquid nitrogen. The computer display shows the measured 137Cs spectrum with the expected 662 keV emission line and the Compton continuum (Credit: Alex Lowell).
May 2024
Aluminum parts for the EM cryostat assembly, including the main shell and lid on the left and parts for connecting to the cryocooler on the right (Credit: Chris Smith, Brad Pafchek, Matt Rubly). The EM shield wall on the vibe table (Credit: Alena Thompson, Lee Mitchell, Eric Wulf, Parshad Patel).
November 2024
COSI first light image. This is a Compton-reconstructed image from data taken with a 137Cs 662 keV source illuminating a 64-strip germanium detector. The image verifies the operation of the detector with flight-like electronics and software. However, it is not representative of the expected COSI angular resolution because it is a near-field image projected in the far-field (Credit: Andreas Zoglauer).