The Baryon Mapping Experiment (BMX), a 21cm intensity mapping pathfinder
  The Baryon Mapping eXperiment (BMX) is an interferometric array designed as a
pathfinder for a future post-reionization 21 cm intensity mapping survey. It
consists of four 4-meter parabolic reflectors each having offset pyramidal horn
feed, quad-ridge orthomode transducer, temperature-stabilized RF amplification
and filtering, and pulsed noise injection diode. An undersampling readout
scheme uses 8-bit digitizers running at 1.1 Gsamples/sec to provide access to
signals from 1.1 - 1.55 GHz (third Nyquist zone), corresponding to HI emission
from sources at redshift $0 < z < 0.3$. An FX correlator is implemented in GPU
and generates 28 GB/day of time-ordered visibility data. About 7,000 hours of
data were collected from Jan. 2019 - May 2020, and we will present results on
system performance including sensitivity, beam mapping studies, observations of
bright celestial targets, and system electronics upgrades. BMX is a pathfinder
for the proposed PUMA intensity mapping survey in the 2030s.
