Developments of highly-multiplexed, multi-chroic pixels for
  Balloon-Borne Platforms
  We present our work to develop and characterize low thermal conductance
bolometers that are part of sinuous antenna multi-chroic pixels (SAMP). We use
longer, thinner and meandered bolometer legs to achieve 9 pW/K thermal
conductance bolometers. We also discuss the development of inductor-capacitor
chips operated at 4 K to extend the multiplexing factor of the frequency domain
multiplexing to 105, an increase of 60% compared to the factor currently
demonstrated for this readout system. This technology development is motivated
by EBEX-IDS, a balloon-borne polarimeter designed to characterize the
polarization of foregrounds and to detect the primordial gravity waves through
their B-mode signature on the polarization of the cosmic microwave background.
EBEX-IDS will operate 20,562 transition edge sensor bolometers spread over 7
frequency bands between 150 and 360 GHz. Balloon and satellite platforms enable
observations at frequencies inaccessible from the ground and with higher
instantaneous sensitivity. This development improves the readiness of the SAMP
and frequency domain readout technologies for future satellite applications.
