Artificial intelligence for the CTA Observatory scheduler

Josep Colomé, Pau Colomer, Jordi Campreciós, Thierry Coiffard, Emma De Oña, Giovanna Pedaletti, Diego F. Torres, Alvaro Garcia-Piquer

Producció científica: Capítol de llibreContribució a congrés/conferènciaAvaluat per experts

9 Cites (Scopus)

Resum

The Cherenkov Telescope Array (CTA) project will be the next generation ground-based very high energy gamma-ray instrument. The success of the precursor projects (i.e., HESS, MAGIC, VERITAS) motivated the construction of this large infrastructure that is included in the roadmap of the ESFRI projects since 2008. CTA is planned to start the construction phase in 2015 and will consist of two arrays of Cherenkov telescopes operated as a proposal-driven open observatory. Two sites are foreseen at the southern and northern hemispheres. The CTA observatory will handle several observation modes and will have to operate tens of telescopes with a highly efficient and reliable control. Thus, the CTA planning tool is a key element in the control layer for the optimization of the observatory time. The main purpose of the scheduler for CTA is the allocation of multiple tasks to one single array or to multiple sub-arrays of telescopes, while maximizing the scientific return of the facility and minimizing the operational costs. The scheduler considers long- and short-term varying conditions to optimize the prioritization of tasks. A short-term scheduler provides the system with the capability to adapt, in almost real-time, the selected task to the varying execution constraints (i.e., Targets of Opportunity, health or status of the system components, environment conditions). The scheduling procedure ensures that long-term planning decisions are correctly transferred to the short-term prioritization process for a suitable selection of the next task to execute on the array. In this contribution we present the constraints to CTA task scheduling that helped classifying it as a Flexible Job-Shop Problem case and finding its optimal solution based on Artificial Intelligence techniques. We describe the scheduler prototype that uses a Guarded Discrete Stochastic Neural Network (GDSN), for an easy representation of the possible long- and short-term planning solutions, and Constraint Propagation techniques. A simulation platform, an analysis tool and different test case scenarios for CTA were developed to test the performance of the scheduler and are also described.

Idioma originalAnglès
Títol de la publicacióObservatory Operations
Subtítol de la publicacióStrategies, Processes, and Systems V
EditorsAlison B. Peck, Chris R. Benn, Robert L. Seaman
EditorSPIE
ISBN (electrònic)9780819496171
DOIs
Estat de la publicacióPublicada - 2014
Publicat externament
EsdevenimentObservatory Operations: Strategies, Processes, and Systems V - Montreal, Canada
Durada: 25 de juny 201427 de juny 2014

Sèrie de publicacions

NomProceedings of SPIE - The International Society for Optical Engineering
Volum9149
ISSN (imprès)0277-786X
ISSN (electrònic)1996-756X

Conferència

ConferènciaObservatory Operations: Strategies, Processes, and Systems V
País/TerritoriCanada
CiutatMontreal
Període25/06/1427/06/14

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