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Reference : UMR7178-REGSOM-039
Workplace : STRASBOURG
Date of publication : Wednesday, February 05, 2020
Type of Contract : FTC Scientist
Contract Period : 24 months
Expected date of employment : 15 April 2020
Proportion of work : Full time
Remuneration : Between 2643,22 and 2843,22 euros gross per month (professional experience requested less than 2 years)
Desired level of education : PhD
Experience required : Indifferent
Development of the calibration of the Virgo interferometer, using the technique of modifying the gravitational field using rotating asses (“NCal” technique). Contribution to the development and operation of the MBTA pipeline used for the search of binary coalescing systems.
• Operation of the existing Newtonian calibrator (NCal).
• Design a new NCal, allowing a more accurate calibration, thanks to the system optimization, manufacturing and metrology quality insurance.
• Contribution to the operation of the MBTA pipeline, searching for binary coalescence system, and possible follow-up of interesting candidates, especially in the case of an association with one or more neutrinos.
• Contribution to the MBTA pipeline improvement, toward the data taking run that should start early 2020 (reduction of the latency, better noise rejection, search of single detector triggers.
• Connaissance des détecteurs d'ondes gravitationnelle.
• Compétence en instrumentation appréciée, et/ou une motivation claire pour s'investir sur l'instrumentation.
• Familier avec le contexte de travail des collaborations internationales.
• Maitrise de l'anglais à l'écrit comme à l'oral.
• A l'aise avec les outils de calculs et de programmations usuels : linux, C++, ROOT, etc…
The position is within the Virgo collaboration, which is in charge of the gravitational wave detector Virgo, located near Pisa, Italy.
In 2007, a tight relationship started with the LIGO scientific collaboration, which use two interferometers in the US. This collaboration enabled a full data sharing and joint searches of gravitational wave events. Within this framework, the MBTA pipeline is used to perform an online analysis of the LIGO and Virgo data, to produce public alerts for interesting candidate events. This collaboration with LIGO includes the coordination of the data taking, including the ongoing “O3” data taking that is schedule up to end of April. Exchanges on instrumental topics, including calibration, are also part of the agreement with LIGO.
Following the O3 data taking, a shutdown for upgrade of the LIGO and Virgo interferometers is foreseen. It should bring stringer constrains on the calibration, as well as an increase of the number of events to be observed during the next data taking scheduled for early 2022.
This upgrade time will be used to improve the NCal calibration. Starting from the analysis of the O3 data, the weakness of the NCal will be investigated in order to define a new NCal design with reduced systematic uncertainties. The goal is to have a new NCal version for installation in fall 2021. Exchanges with LIGO will be part of the work to be done.
In parallel to this instrumental activity, the MBTA pipeline will be first used for an offline analysis of the O3 data. Then, the pipeline will be improved for the next data taking run. The pipeline latency, noise reject or single detector events detection will be investigated. The follow-up of the candidate events will be part of the work of the MBTA team.
Constraints and risks
Some travels to the Virgo site and to collaboration labs.
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