An Ultra-High Time Resolution Cosmic Ray Detection Mode for the Murchison Widefield Array

AbstractThe science cases for incorporating high time resolution capabilities into modern radio telescopes are as numerous as they are compelling. Science targets range from exotic sources such as pulsars, to our Sun, to recently detected possible extragalactic bursts of radio emission, the so-called fast radio bursts (FRBs). Originally conceived purely as an imaging telescope, the initial design of the Murchison Widefield Array (MWA) did not include the ability to access high time and frequency resolution voltage data. However, the flexibility of the MWA’s software correlator allowed an off-the-shelf solution for adding this capability. This paper describes the system that records the 100 μs and 10 kHz resolution voltage data from the MWA. Example science applications, where this capability is critical, are presented, as well as accompanying commissioning results from this mode to demonstrate verification.

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MWA tied-array processing III: Microsecond time resolution via a polyphase synthesis filter

Publications of the Astronomical Society of Australia ◽

10.1017/pasa.2020.24 ◽

2020 ◽

Vol 37 ◽

Author(s):

S. J. McSweeney ◽

S. M. Ord ◽

D. Kaur ◽

N. D. R. Bhat ◽

B. W. Meyers ◽

...

Keyword(s):

Time Resolution ◽

Array Processing ◽

High Time ◽

High Time Resolution ◽

Potential Error ◽

Murchison Widefield Array ◽

Synthesis Filter ◽

Resolution Data

Abstract A new high time resolution observing mode for the Murchison Widefield Array (MWA) is described, enabling full polarimetric observations with up to $30.72\,$ MHz of bandwidth and a time resolution of ${\sim}$ $0.8\,\upmu$ s. This mode makes use of a polyphase synthesis filter to ‘undo’ the polyphase analysis filter stage of the standard MWA’s Voltage Capture System observing mode. Sources of potential error in the reconstruction of the high time resolution data are identified and quantified, with the $S/N$ loss induced by the back-to-back system not exceeding $-0.65\,$ dB for typical noise-dominated samples. The system is further verified by observing three pulsars with known structure on microsecond timescales.

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A cosmic ray test platform based on high time resolution MRPC technology

Chinese Physics C ◽

10.1088/1674-1137/39/5/056003 ◽

2015 ◽

Vol 39 (5) ◽

pp. 056003

Author(s):

Tian-Xiang Chen ◽

Cheng Li ◽

Yong-Jie Sun ◽

Hong-Fang Chen ◽

Ming Shao ◽

...

Keyword(s):

Time Resolution ◽

Cosmic Ray ◽

High Time ◽

High Time Resolution ◽

Test Platform

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A SEARCH FOR FAST RADIO BURSTS AT LOW FREQUENCIES WITH MURCHISON WIDEFIELD ARRAY HIGH TIME RESOLUTION IMAGING

The Astronomical Journal ◽

10.1088/0004-6256/150/6/199 ◽

2015 ◽

Vol 150 (6) ◽

pp. 199 ◽

Cited By ~ 36

Author(s):

S. J. Tingay ◽

C. M. Trott ◽

R. B. Wayth ◽

G. Bernardi ◽

J. D. Bowman ◽

...

Keyword(s):

Time Resolution ◽

High Time ◽

High Time Resolution ◽

Radio Bursts ◽

Low Frequencies ◽

Resolution Imaging ◽

Murchison Widefield Array

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Solar Corona Investigation by the Coronal Line Photometer at Lomnický Peak

International Astronomical Union Colloquium ◽

10.1017/s0252921100025744 ◽

1994 ◽

Vol 144 ◽

pp. 431-434

Author(s):

M. Minarovjech ◽

M. Rybanský

Keyword(s):

Solar Corona ◽

Time Resolution ◽

Active Regions ◽

High Time ◽

High Time Resolution ◽

List Type ◽

Type Number ◽

Coronal Line ◽

Global Cycle

AbstractThis paper deals with a possibility to use the ground-based method of observation in order to solve basic problems connected with the solar corona research. Namely:1.heating of the solar corona2.course of the global cycle in the corona3.rotation of the solar corona and development of active regions.There is stressed a possibility of high-time resolution of the coronal line photometer at Lomnický Peak coronal station, and use of the latter to obtain crucial observations.

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