Spectral Scan

It is possible to define a complicated setup involving multiple tunings that are meant to cover a contiguous range in frequency using the spectral scan interface. Given a start and stop frequency, and a correlator mode, the OT will devise a set of tunings that achieve the requested frequency range. The tunings are overlapped to ensure that bad edge channels can be flagged without leading to gaps in the combined spectrum. The overlaps are greatest for the 1875 MHz-wide spectral windows ($\sim$170 MHz) and smaller ($\sim$31 MHz) for the remainder.

Once enough information has been added, the OT will calculate a tuning setup and display the derived spectral windows. Spectral scans are only allowed for sources observed with a single pointing and cannot observe in full polarization. Starting from Cycle 10, TP Spectral Scans are also allowed.

The ALMA OT Team, 2024 Mar 01