The CTA project is an initiative to build the next generation ground-based very high-energy gamma-ray instrument. The success of the precursor projects (i.e. MAGIC, VERITAS and H.E.S.S.) motivated the construction of this large infrastructure that is included in the roadmap of the ESFRI projects since 2008. CTA is in construction phased and is planned to start in late-2017. It will consist of two arrays of Cherenkov telescopes operated as a proposal-driven open observatory. To view the full sky, two CTA sites are foreseen at southern and northern hemispheres, with three telescopes types (Large, Medium and Small - LST, MST, SST). The northern observatory will be built in La Palma, in the Canary Island, whereas the southern one will be placed in Chile in the Atacama desert.

CTA foresees a factor of 5-10 improvement in sensitivity above 20 GeV and up to 300 TeV, extending the accessible energy range to explore the lowest and highest energy limits with unprecedented sensitivity. CTA will boost the field of Galactic and extragalactic sources, increasing the number of detected sources and the quality of the gamma-ray results by at least a factor 10.

The CTA observatory will have to deal with a large variety of observation modes and will have to operate tens of telescopes with a highly efficient and reliable control. The control software is required to operate with an idle time shorter than 10 s, which is a hard requirement for the control applications. A well-designed, failure-tolerant software system must be developed to control all the CTA observatory systems. Moreover, a complex and intelligent scheduling application and control system have been identified as critical ingredients for the efficient and reliable operation of the facility. The Institute is responsible for the development of the scheduler since 2010. This task is included in the CTA Array Control (ACTL) work package and is a key element in the control layer for the observatory time optimisation. Our institute is also committed to develop and install the central control for the LST prototype, that will manage the operation and communication between the telescope different subsystems, and that will be extended to the rest of the telescopes units.
The Galactic Plane survey simulation. It is based on a simulation of the events that will be recorded by both CTA arrays, which, when combined, will provide an unprecedented view of our Milky Way. The simulation reflects our current knowledge about the population of very-high-energy sources in our Galaxy and comprises objects such as the remnants of supernova explosions, the nebulae created by young energetic pulsars and diffuse emission components arising from the interaction of energetic particles with the interstellar medium and radiation fields. In total, we expect to be able to detect about 500 individual sources of gamma-ray emission in the course of the survey. An important fraction of these sources will be spatially resolved by CTA, providing insights into the physics that accelerate particles to the highest energies and how these particles leave their accelerating sources.
Aim of our participation

The Institute has been involved in the CTA Project from 2006 in both the technical, as part of the Array Control and DAQ System (ACTL) working group and leading the scheduler team and in preparing the scientific exploitation of the observatory. Concerning the scientific exploitation, our institute is leading a number of the 'Key Science Programs', putting an effort of maximising the physic output of the observatory. Our team is responsible for designing the Galactic observations of CTA. We are also in charge of coordinating the studies for the first light Galactic observations of CTA and its pathfinders, and of coordinating the necessary multi-wavelength activities (such MoU with other large installations). This follows our earlier efforts: we have been the global Science Coordinator of the whole collaboration for 8 years in the period 2007-2014, having responsibilities in the scientific definition of the experiment, up to Technical Design Report.

Recent Developments

The CTA northern hemisphere array site in La Palma has been full of activity recently as site infrastructure design studies commence and the Large-Sized Telescope (LST) prototype prepares for the next stage of assembly. We continued to work on the scheduler software and telescope central control tools. During 2017, we presented the first simulations for a muti-facility scheduling concept, as a way of maximizing simultaneous observations. Emma de O–a was named Deputy Physics Coordinator.
The latest iteration of the Cherenkov Telescope ArrayÕs (CTAÕs) science case, "Science with the Cherenkov Telescope Array", was made available in September 2017. Diego F. Torres was one of the main editors of the document.

Recent Publications

'Science with the Cherenkov Telescope Array', J. Hinton, R. Ong, and Diego F. Torres (Editors), October, 211 pages.

Senior Institute members involved

E. de Oña, D. F. Torres, J. Colomé
Institute of Space Sciences (IEEC-CSIC)

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An institute of the Consejo Superior de Investigaciones Científicas

An institute of the Consejo Superior de Investigaciones Científicas
Affiliated with the Institut d'Estudis Espacials de Catalunya

Affiliated with the Institut d'Estudis Espacials de Catalunya