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

Interstitial radiotherapy of the base of the tongue. Improved non-looping afterloading technique.

P6modification of the non-looping afterloading interstitial technique for tongue-cancer therapy is described. The subsequent risk of tearing or breaking of the tubes, resulting in radioactive sources left as foreign bodies in soft tissues, is reduced. In addition, evaluation of implant position is simplified by the use of radioopaque tubes

Screening hallucinogenic drugs. II. Systematic study of two behavioral tests

ESCOLA PAULISTA MED,DEPT PSICOBIOL,SAO PAULO,BRAZILESCOLA PAULISTA MED,DEPT PSICOBIOL,SAO PAULO,BRAZILWeb of Scienc