A focal plane based on MKID has been designed for cosmic microwave background (CMB) B-mode
polarization experiments. We are designing and developing a focal plane with broadband corrugated
horn array, planar OMT, 180 degree hybrid, bandpass filters, and MKIDs. The focal plane consists of 3
octave bands (55 - 108 GHz, 80 - 160 GHz, 160 - 320 GHz), 10 hexagonal modules. Broadband corrugated
horn-array has been directly machined from an Al block and measured to have a good beam shape which
is consistent with electromagnetic field simulations in octave bands. The horn array is designed to be low
standing-wave, light weight, and electromagnetic shield. The broadband 4 probes ortho-mode transducer
(OMT) is fabricated on Si membrane of an SOI wafer. A broadband 180 degree hybrid made with
coplanar waveguide (CPW) is used to reduce higher modes of the circular waveguide. Two bandpass
filters of each polarization are patterned with Nb microstrip. A prototype of the broadband corrugated
horn coupled MKIDs has been fabricated and tested.
This paper summarizes the performance of all the 73 ALMA band 10 cartridges in terms of noise performance and/or optical efficiencies compared to the required ALMA specifications. In particular, the measured optical performance is compared with the results of novel statistical Monte Carlo analyses carried out before receiver production. Some of the technical difficulties encountered during production are briefly described. Finally, some of the first light results of the first receivers used in Chile are presented.