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A total of 73 dual polarization superconductor–insulator–superconductor (SIS) receivers for the Atacama Large Millimeter/submillimeter Array (ALMA) have been successfully produced to observe astronomical signals in the frequency band of 787–950 GHz. For the mass production of waveguide SIS mixer chips used in the receivers, we have tested two different compositions of $\mbox{Nb}_{1-x}\mbox{Ti}_{x}\mbox{N} $...
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