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Outline

Title
Abstract
Introduction
Calibration Design Principles
Pointing Calibration of the Telescopes
Relative Calibration of Telescopes
Relative Pointing Between Telescopes
Relative Time Between Telescopes
Conclusions
References

Calibration strategies for the Cherenkov Telescope Array

Profile image of Michele DoroMichele DoroProfile image of Michael DanielMichael Daniel

2014, Observatory Operations: Strategies, Processes, and Systems V

https://doi.org/10.1117/12.2054536
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15 pages

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Abstract

The Central Calibration Facilities workpackage of the Cherenkov Telescope Array (CTA) observatory for very high energy gamma ray astronomy defines the overall calibration strategy of the array, develops dedicated hardware and software for the overall array calibration and coordinates the calibration efforts of the different telescopes. The latter include LED-based light pulsers, and various methods and instruments to achieve a calibration of the overall optical throughput. On the array level, methods for the inter-telescope calibration and the absolute calibration of the entire observatory are being developed. Additionally, the atmosphere above the telescopes, used as a calorimeter, will be monitored constantly with state-of-the-art instruments to obtain a full molecular and aerosol profile up to the stratosphere. The aim is to provide a maximal uncertainty of 10% on the reconstructed energy-scale, obtained through various independent methods. Different types of LIDAR in combination with all-sky-cameras will provide the observatory with an online, intelligent scheduling system, which, if the the sky is partially covered by clouds, gives preference to sources observable under good atmospheric conditions. Wide-field optical telescopes and Raman Lidars will provide online information about the heightresolved atmospheric extinction, throughout the field-of-view of the cameras, allowing for the correction of the reconstructed energy of each gamma-ray event. The aim is to maximize the duty cycle of the observatory, in terms of usable data, while reducing the dead time introduced by calibration activities to an absolute minimum. , Telephone: +34 93 581 2935 * Additional information on those experiments can be found at www.mpi-hd.mpg.de/hfm/HESS/, wwwmagic.mppmu.mpg. de and veritas.sao.arizona.edu, respectively. † See www.cta-observatory.org.

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