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ACA Total Power Array Spectrometer PDR
Monday, 10 April 2017

On February 20 and 21, 2017, two-day ALMA ACA Total Power (TP) Array Spectrometer Preliminary Design Review (PDR) took place at the Korea Astronomy and Space Science Institute (KASI). About 20 participants, including researchers and engineers from Japan, Korea, Europe, and North America reviewed the development status of the spectrometer.

ACA Total Power Array Spectrometer PDR

Credit: KASI | Download image

Among the total 66 ALMA antennas, 16 antennas developed by Japan compose the Atacama Compact Array (ACA) nicknamed “Morita Array.” The ACA consists of twelve 7-m antennas and four 12-m antennas, the latter of which forms a group of antennas called Total Power (TP) Array, specially designed for precise measurement of the intensity of radio waves coming from target objects.

Although the ALMA telescope and the ACA have already been in operation for scientific observations, the development plans for the upgrades are in progress to keep ALMA delivering remarkable results as a front-line telescope. One of such development programs is the TP array spectrometer, mainly developed by KASI, a digital spectrometer using GPU with accelerated processing speed to achieve higher sensitivity and accuracy than existing spectrometers.

In the PDR, the participants shared the scientific goals and technical challenges with the new spectrometer and the status of hardware/software design and development and discussed the schedule and items for improvement. The review committee highly evaluated the steady progress of the development and gave the green light to continue the development.

The photo shows the participants of the PDR.

ACA Total Power Array Spectrometer PDR

Credit: KASI | Download image

Additional information

ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada), NSC and ASIAA (Taiwan), and KASI (Republic of South Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ.


Nicolás Lira T.
Press Coordinator
Joint ALMA Observatory
Santiago, Chile
Tel: +56 2 24 67 65 19
Cell: +56 9 94 45 77 26
Email: nicolas.lira@alma.cl

Masaaki Hiramatsu

Education and Public Outreach Officer, NAOJ Chile
Tokyo, Japan

Tel: +81 422 34 3630

E-mail: hiramatsu.masaaki@nao.ac.jp