VLPC Characterization for the Dzero Upgrade
  We have studies the performance characteristics of approximately 4000 Visible Light Photon Counters(VLPC) over a range of operating temperatures and biases. We will describe the characterization procedure and present the measured gain, noise and the relative quantum efficiency for the devices. We will also discuss the general operation of the devices and the significant problems during the characterization. 
Chul Hi Park (Fermilab), D0 Collaboration