EUSO-TA is a complete prototype of the JEM-EUSO space telescope located at the Telescope Array (TA) site in Black Rock Mesa, Utah, USA. The telescope can perform observations of ultraviolet light generated by cosmic-ray showers as well as from artificial sources. The aim of the project is to test the EUSO technology and study the detector response in conjuction with the TA fluorescence detector. The detector consists of two, 1 m2 square Fresnel lenses with a field of view of 11-11. Light is focused on the Photo Detector Module (PDM), identical to the ones that will be employed in the JEM-EUSO and K-EUSO focal surfaces. The PDM is composed of 36 Hamamatsu multi-anode photomultipliers (64 channels per tube), for a total of 2304 channels. Front-End readout is performed by 36 ASICS, with trigger and readout tasks performed by two acquisition boards that send the data to a CPU and storage system. The telescope is housed in a shed located in front of one of the fluorescence detectors of the Telescope Array experiment, pointing in the direction of the ELS (Electron Light Source) and CLF (Central Laser Facility). The performance of the detector has been very good, with little (one photoelectron) electronic noise and a Point Spread Function of stars according to expectations. Measurements of the UV background in different darkness conditions and moon phases and positions have been completed. In the spring 2015 campaign, observations of various stars of different magnitude and color index have been performed. Furthermore, cosmic ray events - triggered by TA - have also been observed. Subsequent work for 2015 and following years is to increase the statistics of cosmic-ray events and implement a self-trigger adapting the EUSO trigger (optimized for space observation at a distance of 400 km) to the geometry of EUSO-TA.
EUSO-TA a ground telescope at the Telescope Array to test JEM-EUSO detector performance / Casolino, M.; Ricci, M.; Adams, J.; Barillon, P.; Bayer, J.; Belz, J.; Bergman, D.; Bertaina, M.; Bisconti, F.; Christl, M. J.; Cummings, A.; Distratis, G.; Ebersoldt, A.; Ebisuzaki, T.; Eser, J.; Fenu, F.; Fujii, T.; Fukushima, M.; Gottschall, D.; Haungs, A.; Hunt, P.; Ikeda, D.; Jung, A.; Kajino, F.; Kawasaki, Y.; Larsson, O.; Matthews, J. N.; Nonaka, T.; Ogio, S.; Osteria, G.; Picozza, P.; Piotrowski, L. W.; Plebaniak, Z.; Sagawa, H.; Sakurai, N.; Scotti, V.; Shin, H.; Shibata, T.; Shinozaki, K.; Smith, J. D.; Sokolsky, P.; Takeda, M.; Takizawa, Y.; Tameda, Y.; Tenzer, C.; Thomas, S. B.; Thomson, G. B.; Tokuno, H.; Tomida, T.; Tsunesada, Y.; Wiencke, L.. - 30-July-2015:(2015).
EUSO-TA a ground telescope at the Telescope Array to test JEM-EUSO detector performance
Scotti, V.;
2015
Abstract
EUSO-TA is a complete prototype of the JEM-EUSO space telescope located at the Telescope Array (TA) site in Black Rock Mesa, Utah, USA. The telescope can perform observations of ultraviolet light generated by cosmic-ray showers as well as from artificial sources. The aim of the project is to test the EUSO technology and study the detector response in conjuction with the TA fluorescence detector. The detector consists of two, 1 m2 square Fresnel lenses with a field of view of 11-11. Light is focused on the Photo Detector Module (PDM), identical to the ones that will be employed in the JEM-EUSO and K-EUSO focal surfaces. The PDM is composed of 36 Hamamatsu multi-anode photomultipliers (64 channels per tube), for a total of 2304 channels. Front-End readout is performed by 36 ASICS, with trigger and readout tasks performed by two acquisition boards that send the data to a CPU and storage system. The telescope is housed in a shed located in front of one of the fluorescence detectors of the Telescope Array experiment, pointing in the direction of the ELS (Electron Light Source) and CLF (Central Laser Facility). The performance of the detector has been very good, with little (one photoelectron) electronic noise and a Point Spread Function of stars according to expectations. Measurements of the UV background in different darkness conditions and moon phases and positions have been completed. In the spring 2015 campaign, observations of various stars of different magnitude and color index have been performed. Furthermore, cosmic ray events - triggered by TA - have also been observed. Subsequent work for 2015 and following years is to increase the statistics of cosmic-ray events and implement a self-trigger adapting the EUSO trigger (optimized for space observation at a distance of 400 km) to the geometry of EUSO-TA.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
