Single-dish observing modes are available for using the Total Power (TP) Array as part of the ALMA Compact Array (ACA).

The TP Array is used to recover extended emission when mapping angular scales up to the size of the requested map areas. TP Array observations are included only if the LAS cannot be achieved with the 7-m Array, and the TP Array can only be used for spectral-line observations (not continuum) in Bands 3 through 8. No Band 1, Band 9 or Band 10 TP Array observations are offered for this cycle.

The TP Array cannot be requested in a stand-alone mode using the ALMA OT. However, if a user has existing 7-m Array data through their own program or through archival data, but now realizes that TP Array data are needed to obtain short spacings, they can submit a proposal requesting both the 7-m Array and TP Array.

Please refer to Appendix section "Total Power Array" of the ALMA Proposer's Guide for details.