Departamento de Física

Facultad de Ciencia
Universidad de Santiago de Chile

Seminario - Miercoles 9 de Enero - 15:30 - Daniel Montofré - Universidad de Chile

01/10/2019 - 15:30
El Miércoles 9 de Enero a las 15:30 horas, Daniel Montofré, estudiante de Doctorado en la Universidad de Chile y que trabaja en desarrollo de instrumentación para astronomía, dará una charla en la sala de seminarios del tercer piso del Departamento de Física


Instrumentation Development of Innovative Radio-Devices to Improve the Coming Cycles of Radio Astronomy Observations
Daniel Montofré, estudiante de Doctorado en la Universidad de Chile


At present, the Atacama Large Millimeter/Submillimeter Array (ALMA) represents the largest astronomical project in existence, which is composed of 66 high precision antennas with advanced technology. Despite being in one of the best sites for performing mm and submm radio astronomy (Chajnantor plateau located at the Atacama Desert in northern Chile), ALMA is not exempt from image degradation caused by atmospheric effects or instabilities in the instruments. To ensure that it operates at its full potential during the next years and decades it is necessary to maintain a continuous development program.

As a part of this program, we propose to develop a dual‐frequency atmospheric phase-error calibration method using ALMA Bands by means of external optics on a few ALMA baselines employing existing ALMA receivers. This method is devised to demonstrate the advantages of receiving signal simultaneously at different frequencies from the same area of the sky. When implemented, it will permit an increase of accuracy in determining phase correction due to atmospheric turbulence; improve image quality; double instantaneous frequency coverage for line searches. This project involves designing an optical system at room temperature for combining the beams of existing Bands, implementing limited modifications of signal transfer at few ALMA antennas and making dual-frequency observations with ALMA. Here we demonstrate that very limited impact on the existing ALMA system is needed and present the optical system that it will be used. The specific objectives of this project are to study the feasibility, practical implementation and benefits of simultaneous multi-band beam-combined observations with ALMA. 
Doctorado en Ciencia con Mención en Física