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15% of losses. The DAQ works now on all three INP detectors: KEDR, SND and KMD-2.
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doi:10.1016/j.nima.2006.10.216 
Copyright © 2006 Elsevier B.V. All rights reserved.
Digital control and data acquisition system for the QUIET experiment
Available online 17 November 2006.
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Abstract
We present the Digital Control and Data Acquisition System (DCDAQ) for Phase I of the Q/U Imaging Experiment (QUIET), arrays of 91 W-band and 19 Q-band receivers, placed on 1.4 m telescopes, in Chajnantor, Chile to measure the polarization of the cosmic microwave background. QUIET uses custom-built electronics boards that control and monitor its polarimeters. Each of these boards is digitally addressable, so that the DCDAQ can set and monitor any of the 1600 biases needed to operate the 91 receivers. The DCDAQ consists of a controller and up to 13 custom-made 32-channel ADC cards. Local FPGAs allow real-time data processing for each channel. This immediate data reduction is necessary, as it is planned to scale this technology beyond Phase I. The DCDAQ system is implemented with this future in mind and can easily be scaled to operate 1000 receivers.
Keywords: EMT; Polarimeters; MMIC; DAQ
PACS classification codes: 98.80.Es
