A GPU (Graphic Processing Unit) spectrometer for the ALMA (Atacama Large Millimeter/submillimeter Array) Total Power Array has been developed by the KASI (Korea Astronomy and Space Science Institute) and the NAOJ (National Astronomy Observatory of Japan).  It is a first in-kind contribution of the KASI to the ALMA collaboration.  A radio telescope generates huge amount of data. For example, one ALMA antenna generates 32 Giga samples per second. Due to the rapid performance improvement of GPU technology, it is possible to process data from a radio telescope based on GPU technology.  The development project went through a series of milestones, from a concept design review in 2016 to commission and science verification in 2022.  A final acceptance review was scheduled in January 2023.    

During the ALMA (Atacama Large Millimeter/submillimeter Array) maintenance period, February, 2022, the GPU spectrometer was installed in a technical building at the Array Operation Site by its developers from  the KASI and the NAOJ.   Right after the installation, SiO (J=2-1; v=1) 86 GHz maser spectral lines from the Orion KL region were successfully detected using the spectrometer.   The spectrometer will be used from the Cycle 10 (October 2023). In my talk, I will introduce the GPU spectrometer and tell a successful story of the spectrometer installation during the COVID-19 pandemic.