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SUMMARY:Real-Time Wideband Widefield Mutual Coupling Compensation for SKA-
 Low - Dr. Oscar O'Hara (Cavendish Astrophysics)
DTSTART:20251125T111500Z
DTEND:20251125T120000Z
UID:TALK239983@talks.cam.ac.uk
CONTACT:Charles Walker
DESCRIPTION:Mutual coupling (MC) among SKA-Low’s log-periodic antennas i
 ntroduces narrowband resonances that imprint sharp spectral structure on t
 he embedded element patterns (EEPs). These features disrupt the spectral s
 moothness required by time-gating foreground-removal techniques\, allowing
  bright astrophysical emission to leak into and obscure the faint 21-cm co
 smological signal. Full-wave\, end-to-end simulations show that MC substan
 tially increases spectral complexity\, and that effective foreground suppr
 ession therefore requires station-beam models with high spectral resolutio
 n and far-field accuracy at the level of 4–5 significant digits\, well b
 eyond the assumptions of many current EoR pipelines.\n\nIn this talk\, we 
 leverage the formal equivalence between phased-array beamforming and inter
 ferometric imaging to perform real-time\, wideband\, wide-field\, directio
 n-dependent calibration directly on the incoming voltage streams\, through
  reconstructing element patterns through inversion of stacked Jones matric
 es. We demonstrate how station-level processing can partially compensate s
 evere MC effects before quantify the required EEP accuracy for interferome
 tric MC mitigation. This work links antenna theory with radio-interferomet
 ric calibration\, outlining a practical path toward robust\, wideband mutu
 al-coupling suppression for 21-cm EoR experiments.
LOCATION:Coffee area\, Battcock Centre
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