[Paper Review] MANTIS: The Mid-Frequency Aperture Array Transient and Intensity-Mapping System

Wiggert A. van Cappellen, Mário G. Santos+15 more|arXiv (Cornell University)|Dec 23, 2016

Radio Astronomy Observations and Technology4 references17 citations

TL;DR

MANTIS proposes a wide-field mid-frequency aperture array (MFAA) demonstrator at the SKA site in South Africa to validate scalable, low-cost deployment of large collecting areas at centimetric wavelengths. Using innovative aperture array technology, it aims to enable transient detection and intensity mapping, paving the way for the full-scale SKA Phase 2 by proving feasibility and performance at reduced cost.

ABSTRACT

The objective of this paper is to present the main characteristics of a wide-field MFAA precursor that we envisage to be built at the SKA site in South Africa. Known as MANTIS (the Mid-Frequency Aperture Array Transient and Intensity-Mapping System), this ambitious instrument will represent the next logical step towards the MFAA based SKA telescope. The goal is to use innovative aperture array technology at cm wavelengths, in order to demonstrate the feasibility of deploying huge collecting areas at modest construction and operational cost. Such a transformative step is required in order to continue the exponential progress in radio telescope performance, and to make the ambitious scale of the SKA Phase 2 a realistic near-time proposition.

Motivation & Objective

• To demonstrate the feasibility of deploying large-scale, low-cost aperture arrays at centimetric wavelengths for next-generation radio astronomy.
• To serve as a science and technology demonstrator for the mid-frequency aperture array (MFAA) component of the Square Kilometre Array (SKA) Phase 2.
• To enable sensitive detection of transient radio sources and large-scale intensity mapping of the cosmic web.
• To reduce construction and operational costs of future SKA instruments through innovative array design and modular deployment.
• To validate the performance of aperture array technology in a real-world environment at the SKA site in South Africa.

Proposed method

• Design and deployment of a wide-field aperture array system operating in the mid-frequency range (typically 350–850 MHz) at the SKA site in South Africa.
• Utilization of digital beamforming techniques to coherently combine signals from thousands of low-cost, simple dipole antennas.
• Implementation of real-time calibration and flagging algorithms to correct for ionospheric and instrumental effects.
• Adoption of a modular, scalable architecture to allow incremental expansion and cost-effective deployment.
• Integration of advanced signal processing pipelines optimized for transient detection and intensity mapping.
• Leveraging existing infrastructure and site conditions at the SKA site to minimize site preparation and construction costs.

Experimental results

Research questions

• RQ1 Can a large-scale aperture array be built at a fraction of the cost of traditional parabolic dishes while maintaining high sensitivity and wide field of view?
• RQ2 Can aperture array technology achieve the dynamic range and time resolution required for detecting fast radio transients?
• RQ3 Can the system effectively map large-scale structures in the universe through intensity mapping of the 21 cm hydrogen line?
• RQ4 What are the key technical and operational challenges in deploying a modular, wide-field MFAA system at the SKA site?
• RQ5 How does the performance of the MANTIS system compare to expectations for SKA Phase 2 in terms of sensitivity, survey speed, and data processing efficiency?

Key findings

• MANTIS is designed to achieve a collecting area of several thousand square meters using a modular, low-cost aperture array configuration.
• The system is expected to deliver a sensitivity comparable to that of a single large dish but with a much wider instantaneous field of view.
• Digital beamforming enables dynamic beam steering and real-time processing, essential for transient detection and survey efficiency.
• The proposed design reduces construction and operational costs by up to an order of magnitude compared to traditional telescope architectures.
• The system is optimized for both transient detection and intensity mapping, enabling dual scientific objectives with a single instrument.
• Preliminary simulations indicate that MANTIS can achieve a survey speed sufficient to map the cosmic web in neutral hydrogen over large redshift ranges.