Mr. David Melkumyan Profile

David Melkumyan

at Deutsches Elektronen-Synchrotron

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Author

Publications (12)

Proceedings Article | 25 July 2024 Poster + Paper

The resource manager and central control systems for the Cherenkov Telescope Array Observatory

D. Melkumyan, R. Fernandez, D. Kostunin, T. Murach, I. Oya, S. Sah, T. Schmidt

Proceedings Volume 13101, 131012H (2024) https://doi.org/10.1117/12.3018313

KEYWORDS: Telescopes, Atmospheric Cherenkov telescopes, Control systems, Java, Observatories, Data acquisition, Computer programming languages, Databases, C++, Systems modeling

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Proceedings Article | 25 July 2024 Presentation + Paper

The first release of the Cherenkov Telescope Array Observatory array control and data acquisition software

I. Oya, P. Aubert, L. Baroncelli, P. Bolle, P. Bruno, A. Bulgarelli, S. Caroff, L. Castaldini, V. Conforti, A. Costa, L. David, G. De Cesare, E. de Ona Wilhelmli, A. Di Piano, K. Egberts, R. Fernandez, V. Fioretti, S. Fukami, E. Garcia, E. García, H. Gasparyan, S. Germani, C. Hoischen, F. Incardona, D. Kostunin, B. Lopez, E. Lyard, G. Maurin, D. Melkumyan, K. Munari, T. Murach, A. Muraczewski, N. Nakhjiri, D. Neise, G. Panebianco, N. Parmiggiani, E. Pietriga, V. Pollet, I. Sadeh, S. Sah, A. Sarkar, M. Schefer, T. Schmidt, D. Soldevila, C. Steppa, D. Torres, A. Tramacere, R. Vallés, T. Vuillaume, F. Werner

Proceedings Volume 13101, 131011D (2024) https://doi.org/10.1117/12.3017568

KEYWORDS: Telescopes, Atmospheric Cherenkov telescopes, Data acquisition, Control systems, Observatories, Design, Astronomy

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The Cherenkov Telescope Array Observatory (CTAO) is the next-generation atmospheric Cherenkov gamma-ray project. CTAO will be deployed at two sites, one in the Northern and the other in the Southern Hemisphere, containing telescopes of three different sizes for covering different energy domains. The commissioning of the first CTAO Large-sized Telescope (LST-1) is being finalized at the CTAO Northern site. Additional calibration and environmental monitoring instruments such as laser imaging detection and ranging (LIDAR) instruments and weather stations will support the telescope operations. The Array Control and Data Acquisition (ACADA) system is the central element for onsite CTAO operations. ACADA controls, supervises, and handles the data generated by the telescopes and the auxiliary instruments. It will drive the efficient planning and execution of observations while handling the several Gb/s camera data generated by each CTAO telescope. The ACADA system contains the CTAO Science Alert Generation Pipeline – a real-time data processing and analysis pipeline, dedicated to the automatic generation of science alert candidates as data are being acquired. These science alerts, together with external alerts arriving from other scientific instruments, will be managed by the Transients Handler (TH) component. The TH informs the Short-term Scheduler of ACADA about interesting science alerts, enabling the modification of ongoing observations at sub-minute timescales. The capacity for such fast reactions – together with the fast movement of CTAO telescopes – makes CTAO an excellent instrument for studying high-impact astronomical transient phenomena. The ACADA software is based on the Alma Common Software (ACS) framework, and written in C++, Java, Python, and Javascript. The first release of the ACADA software, ACADA REL1, was finalized in July 2023, and integrated after a testing campaign with the LST-1 finalized in October 2023. This contribution describes the design and status of the ACADA software system.

Proceedings Article | 25 July 2024 Presentation + Paper

Methodology for the integration of the array control and data acquisition system with array elements of the Cherenkov Telescope Array Observatory

B. Lopez, P. Aubert, L. Baroncelli, P. Bolle, P. Bruno, A. Bulgarelli, S. Caroff, L. Castaldini, V. Conforti, A. Costa, L. David, G. De Cesare, E. de Ona Wilhelm, A. Di Piano, K. Egberts, R. Fernandez, V. Fioretti, S. Fukami, E. Garcia, H. Gasparyan, S. Germani, F. Incardona, D. Kostunin, E. Lyard, G. Maurin, D. Melkumyan, K. Munari, T. Murach, A. Muraczewski, N. Nakhjiri, D. Neise, I. Oya, G. Panebianco, N. Parmiggiani, V. Pollet, I. Sadeh, S. Sah, A. Sarkar, M. Schefer, T. Schmidt, D. Soldevila, C. Steppa, A. Tramacere, R. Valles, T. Vuillaume, F. Werner

Proceedings Volume 13101, 131010H (2024) https://doi.org/10.1117/12.3017493

KEYWORDS: Integration, Atmospheric Cherenkov telescopes, Observatories, Data acquisition, Control systems, Software development

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The Cherenkov Telescope Array Observatory (CTAO) is the next-generation atmospheric Cherenkov gammaray Observatory. CTAO will be constructed on two sites, one array in the Northern and the other in the Southern hemisphere, containing telescopes of three different sizes, for covering different energy domains. To combine and orchestrate the different telescopes and auxiliary instruments (array elements), the Array Control and Data Acquisition (ACADA) system is the central element for the Observatory on-site operations: it controls, supervises, and handles the data generated by the array elements. Considering the criticality of the ACADA system for future Observatory operations, corresponding quality assurance provisions have been made at the different steps of the software development lifecycle, with focus on continuous integration and testing at all levels. To enable higher-level tests of the software deployed on a distributed system, an ACADA test cluster has been set up to facilitate testing and debugging of issues in a more realistic environment. Furthermore, a separate software integration and test cluster has also been established that allows for the off-site testing of the integrated software packages of ACADA and of the corresponding array elements. Here the software integration can be prepared, interfaces and interactions can be tested, and on-site procedures that are required later in the process can be checked beforehand, only limited by the simulation capabilities that are delivered as part of the software packages. Once preparations and testing with the off-site test cluster are completed, the integrated software can be deployed at the target site. The software packages and setup parameters are kept under configuration control at all stages, and deployment steps are documented to ensure that installations are reproducible. This methodology has been applied for the first time in the context of the integration of ACADA with the first CTAO Large-sized Telescope (LST-1) in October 2023.

Proceedings Article | 6 July 2018 Presentation + Paper

Automatic mirror alignment for the medium-sized telescopes of the Cherenkov Telescope Array using the Bokeh method

Thomas Murach, Ullrich Schwanke, Domenik Ehlert, Markus Garczarczyk, Tim Lukas Holch, Stephan Kaphle, David Melkumyan, Louise Oakes, Gerrit Spengler

Proceedings Volume 10700, 107001U (2018) https://doi.org/10.1117/12.2313517

KEYWORDS: Mirrors, Actuators, Telescopes, Atmospheric Cherenkov telescopes, Stars, Charge-coupled devices, Prototyping, CCD cameras, Point spread functions, Lamps

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Proceedings Article | 6 July 2018 Presentation + Paper

Software testing for the CTA observation execution system

Thomas Murach, Anze Zagar, Urban Leben, Igor Oya, Matthias Füßling, Dejan Dezman, Vito Conforti, Fabian Krack, Etienne Lyard, David Melkumyan, Klemens Mosshammer, Iftach Sadeh, Torsten Schmidt, Ullrich Schwanke, Joseph Schwarz, Stephan Wiesand

Proceedings Volume 10707, 107070D (2018) https://doi.org/10.1117/12.2313437

KEYWORDS: Software development, Atmospheric Cherenkov telescopes, Telescopes, System integration, Process modeling, Java, Control systems, Data storage, Computer architecture, Lead

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Proceedings Article | 6 July 2018 Paper

Prototyping the central control system for the Cherenkov Telescope Array

D. Melkumyan, I. Oya, J. Bobnar, S. Sah, R. Anutarawiramkul, M. Füßling, I. Sadeh, M. Sekoranja, T. Schmidt, U. Schwanke, J. Schwarz, G. Spengler, P. Wegner

Proceedings Volume 10707, 107071R (2018) https://doi.org/10.1117/12.2309659

KEYWORDS: Telescopes, Atmospheric Cherenkov telescopes, Control systems, Java, Prototyping, Systems modeling, Observatories, Data acquisition, Astronomical telescopes, Gamma radiation

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Proceedings Article | 8 August 2016 Paper

Status of the array control and data acquisition system for the Cherenkov Telescope Array

Matthias Füßling, Igor Oya, Arnim Balzer, David Berge, Jerzy Borkowski, Vito Conforti, Josep Colomé, Rico Lindemann, Etienne Lyard, David Melkumyan, Michael Punch, Ullrich Schwanke, Joseph Schwarz, Claudio Tanci, Gino Tosti, Peter Wegner, Ralf Wischnewski, Amanda Weinstein

Proceedings Volume 9913, 99133C (2016) https://doi.org/10.1117/12.2233174

KEYWORDS: Atmospheric Cherenkov telescopes, Telescopes, Control systems, Observatories, Data acquisition, Imaging systems, Observatories, Control systems, Cameras, Prototyping, Systems modeling, Software development

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Proceedings Article | 26 July 2016 Paper

The software architecture to control the Cherenkov Telescope Array

I. Oya, M. Füßling, P. Antonino, V. Conforti, L. Hagge, D. Melkumyan, A. Morgenstern, G. Tosti, U. Schwanke, J. Schwarz, P. Wegner, J. Colomé, E. Lyard

Proceedings Volume 9913, 991303 (2016) https://doi.org/10.1117/12.2232520

KEYWORDS: Atmospheric Cherenkov telescopes, Telescopes, Systems modeling, Chemical elements, Computer architecture, Data acquisition, Control systems, Data modeling, Calibration, Software development

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The Cherenkov Telescope Array (CTA) project is an initiative to build two large arrays of Cherenkov gamma- ray telescopes. CTA will be deployed as two installations, one in the northern and the other in the southern hemisphere, containing dozens of telescopes of different sizes. CTA is a big step forward in the field of ground- based gamma-ray astronomy, not only because of the expected scientific return, but also due to the order-of- magnitude larger scale of the instrument to be controlled. The performance requirements associated with such a large and distributed astronomical installation require a thoughtful analysis to determine the best software solutions. The array control and data acquisition (ACTL) work-package within the CTA initiative will deliver the software to control and acquire the data from the CTA instrumentation. In this contribution we present the current status of the formal ACTL system decomposition into software building blocks and the relationships among them. The system is modelled via the Systems Modelling Language (SysML) formalism. To cope with the complexity of the system, this architecture model is sub-divided into different perspectives. The relationships with the stakeholders and external systems are used to create the first perspective, the context of the ACTL software system. Use cases are employed to describe the interaction of those external elements with the ACTL system and are traced to a hierarchy of functionalities (abstract system functions) describing the internal structure of the ACTL system. These functions are then traced to fully specified logical elements (software components), the deployment of which as technical elements, is also described. This modelling approach allows us to decompose the ACTL software in elements to be created and the ow of information within the system, providing us with a clear way to identify sub-system interdependencies. This architectural approach allows us to build the ACTL system model and trace requirements to deliverables (source code, documentation, etc.), and permits the implementation of a flexible use-case driven software development approach thanks to the traceability from use cases to the logical software elements. The Alma Common Software (ACS) container/component framework, used for the control of the Atacama Large Millimeter/submillimeter Array (ALMA) is the basis for the ACTL software and as such it is considered as an integral part of the software architecture.

Proceedings Article | 18 July 2014 Paper

Towards a global software architecture for operating and controlling the Cherenkov Telescope Array

Matthias Füssling, Igor Oya, Ullrich Schwanke, Jordi Campreciós, Josep Colomé, Thierry Le Flour, Rico Lindemann, Etienne Lyard, David Melkumyan, Torsten Schmidt, Joseph Schwarz, Gino Tosti, Peter Wegner, Amanda Weinstein

Proceedings Volume 9152, 915217 (2014) https://doi.org/10.1117/12.2055433

KEYWORDS: Atmospheric Cherenkov telescopes, Telescopes, Optical proximity correction, Control systems, Bridges, Software frameworks, Data acquisition, Observatories, Astronomical telescopes, Optical instrument design

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Proceedings Article | 18 July 2014 Paper

The control system of the 12-m medium-size telescope prototype: a test-ground for the CTA array control

I. Oya, E. Anguner, B. Behera, E. Birsin, M. Fuessling, R. Lindemann, D. Melkumyan, S. Schlenstedt, T. Schmidt, U. Schwanke, R. Sternberger, P. Wegner, S. Wiesand

Proceedings Volume 9152, 91522G (2014) https://doi.org/10.1117/12.2055169

KEYWORDS: Prototyping, Optical proximity correction, Telescopes, Atmospheric Cherenkov telescopes, Control systems, Java, CCD cameras, Cameras, Databases, OLE for process control

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Proceedings Article | 24 September 2012 Paper

Development of the ACS+OPC UA based control system for a CTA medium size telescope prototype

Bagmeet Behera, Igor Oya, Emrah Birsin, Hendryk Köppel, David Melkumyan, Stefan Schlenstedt, Torsten Schmidt, Ullrich Schwanke, Peter Wegner, Stephan Wiesand, Michael Winde

Proceedings Volume 8451, 84510H (2012) https://doi.org/10.1117/12.923773

KEYWORDS: Prototyping, Telescopes, Control systems, Atmospheric Cherenkov telescopes, Optical proximity correction, Mirrors, Cameras, Actuators, CCD cameras, Charge-coupled devices

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Proceedings Article | 17 September 2012 Paper

Optical design and calibration of a medium size telescope prototype for the CTA

Bagmeet Behera, Jürgen Bähr, Sandra Grünewald, Gareth Hughes, Igor Oya, David Melkumyan, Stefan Schlenstedt, Ullrich Schwanke

Proceedings Volume 8444, 844417 (2012) https://doi.org/10.1117/12.923728

KEYWORDS: Atmospheric Cherenkov telescopes, Mirrors, Telescopes, Prototyping, Cameras, Point spread functions, Calibration, Stars, Actuators, CCD cameras

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Showing 5 of 12 publications

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