Performance and characterization of the SPT-3G digital frequency-domain multiplexed readout system using an improved noise and crosstalk model

The third-generation South Pole Telescope camera (SPT-3G) improves upon its predecessor (SPTpol) by an order of magnitude increase in detectors on the focal plane. The technology used to read out and control these detectors, digital frequency-domain multiplexing (DfMUX), is conceptually the same as used for SPTpol, but extended to accommodate more detectors. A nearly 5× expansion in the readout operating bandwidth has enabled the use of this large focal plane, and SPT-3G performance meets the forecasting targets relevant to its science objectives. However, the electrical dynamics of the higher-bandwidth readout differ from predictions based on models of the SPTpol system due to the higher frequencies used and parasitic impedances associated with new cryogenic electronic architecture. To address this, we present an updated derivation for electrical crosstalk in higher-bandwidth DfMUX systems and identify two previously uncharacterized contributions to readout noise, which become dominant at high bias frequency. The updated crosstalk and noise models successfully describe the measured crosstalk and readout noise performance of SPT-3G. These results also suggest specific changes to warm electronics component values, wire-harness properties, and SQUID parameters, to improve the readout system for future experiments using DfMUX, such as the LiteBIRD space telescope

Stephan Balkenhol : About Men and Sculpture = Stephan Balkenhol : Über Menschen und Skulpturen

Lingwood analyzes Balkenhol's "outdoor" sculptures' paradoxical nature and status as statues/monuments, while Wall situates the artist's practice in relation to the modernist sculptural tradition and the collapse of statuary. Balkenhol, in notes and conversations with Rückriem and Schütte, reveals thoughts on the state of art and sculpture and the role of the artist

The Lectures, Witte de With, 1992

The publication of four lectures and two debates presented in conjunction with the 1992 Witte de With exhibition programme includes 14 authors' critical analyzes on the following topics: Brazilian artist Oiticica, representation and history, the depiction of the human figure, the art catalogue, graphic design/typography, and the interests of the centre itself. Contains listing of exhibitions and publications. Biographical notes on authors. 62 bibl. ref