The DiRAC-2.5y Facility

Lead Research Organisation: University of Cambridge
Department Name: Institute of Astronomy

Abstract

Physicists across the astronomy, nuclear and particle physics communities are focussed
on understanding how the Universe works at a very fundamental level. The distance scales
with which they work vary by 50 orders of magnitude from the smallest distances probed
by experiments at the Large Hadron Collider, deep within the atomic
nucleus, to the largest scale galaxy clusters discovered out in space. The Science challenges,
however, are linked through questions such as: How did the Universe begin and how is it evolving?
and What are the fundamental constituents and fabric of the Universe and how do they interact?

Progress requires new astronomical observations and experimental data but also
new theoretical insights. Theoretical understanding comes increasingly from large-scale
computations that allow us to confront the consequences of our theories very accurately
with the data or allow us to interrogate the data in detail to extract information that has
impact on our theories. These computations test the fastest computers that we have and
push the boundaries of technology in this sector. They also provide an excellent
environment for training students in state-of-the-art techniques for code optimisation and
data mining and visualisation.

The DiRAC2 HPC facility has been operating since 2012, providing computing resources for theoretical research
in all areas of particle physics, astronomy, cosmology and nuclear physics supported by STFC. It is a highly productive
facility, generating 200-250 papers annually in international, peer-reviewed journals. However, the DiRAC facility risks becoming uncompetitive as it has remained static in terms of overall capability since 2012. The DiRAC-2.5x investment in 2017/18 mitigated the risk of hardware failures, by replacing our oldest hardware components. However, as the factor 5 oversubscription of the most recent RAC call demonstrated, the science programme in 2019/20 and beyond requires a significant uplift in DiRAC's compute capability. The main purpose of the requested funding for the DiRAC2.5y project is to provide a factor 2 increase in computing across all DiRAC services to enable the facility to remain competitive during 2019/20 in anticipation of future funding for DiRAC-3.

DiRAC2.5y builds on the success of the DiRAC HPC facility and will provide the resources needed to support cutting-edge research
during 2019 in all areas of science supported by STFC. While the funding is required to remain competitive, the science programme will continue to be world-leading. Examples of the projects which will benefit from this investment include:

(i) lattice quantum chromodynamics (QCD) calculations of the properties of fundamental particles from first principles;
(ii) improving the potential of experiments at CERN's Large Hadron Collider for discovery of new physics by increasing the accuracy of theoretical predictions for rare processes involving the fundamental constituents of matter known as quarks;
(iii) simulations of the merger of pairs of black holes amnwhich generate gravitational waves such as those recently discovered by the LIGO consortium;
(iv) the most realistic simulations to date of the formation and evolution of galaxies in the Universe;
(v) the accretion of gas onto supermassive black holes, the most efficient means of extracting energy from matter and the engine which drives galaxy evolution;
(vi) new models of our own Milky Way galaxy calibrated using new data from the European Space Agency's GAIA satellite;
(vii) detailed simulations of the interior of the sun and of planetary interiors;
(viii) the formation of stars in clusters - for the first time it will be possible to follow the formation of massive stars.

Publications

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Costa T (2018) Quenching star formation with quasar outflows launched by trapped IR radiation in Monthly Notices of the Royal Astronomical Society

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Costa Tiago (2018) Quenching star formation with quasar outflows launched by trapped IR radiation in Monthly Notices of the Royal Astronomical Society

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Costa Tiago (2018) Driving gas shells with radiation pressure on dust in radiation-hydrodynamic simulations in Monthly Notices of the Royal Astronomical Society

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Fiacconi Davide (2018) Galactic nuclei evolution with spinning black holes: method and implementation in Monthly Notices of the Royal Astronomical Society

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Henden Nicholas A. (2018) The FABLE simulations: a feedback model for galaxies, groups, and clusters in Monthly Notices of the Royal Astronomical Society

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Hu Shaoran (2018) Impact of cosmological satellites on stellar discs: dissecting one satelliteat a time in Monthly Notices of the Royal Astronomical Society

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Katz H (2018) A Census of the LyC photons that form the UV background during reionization in Monthly Notices of the Royal Astronomical Society

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Katz Harley (2018) A Census of the LyC photons that form the UV background during reionization in Monthly Notices of the Royal Astronomical Society

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Katz Harley (2019) Tracing the sources of reionization in cosmological radiation hydrodynamics simulations in Monthly Notices of the Royal Astronomical Society