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All sky camera, Lidar, and Electric Field Meter for the ASTRI SST-2M prototype for CTA
G. Leto, R. Zanmar Sanchez, G. Bellassai, P. Bruno, M.C. Maccarone, E. Martinetti (for the ASTRI Collaboration and the CTA Consortium) Leto et al. – 2nd AtmoHEAD, Padua – May 2014
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The ASTRI Program … in brief
ASTRI, ‘’Astrofisica con Specchi a Tecnologia Replicante Italiana’’ The ASTRI Program is an Italian “Progetto Bandiera” funded by the Ministry of Education, University and Research and led by INAF, the Italian National Institute of Astrophysics. Main goals: design, development and production, within the Cherenkov Telescope Array, CTA, framework and following its requirements, of an end-to-end prototype of a Dual-Mirror Small Size Telescope, SST-2M, devoted to the highest gamma-ray energy region (1-100 TeV) investigated by CTA, to be tested under field conditions in 2014, a SST-2M mini-array to be placed at the final CTA Southern Site during 2016, which would constitute the first seed of the CTA Observatory, the mirrors for the prototype of the CTA Medium Size Telescopes, MST. Leto et al. – 2nd AtmoHEAD, Padua – May 2014
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The ASTRI SST-2M telescope
The prototype … devoted to investigate the VHE region, TeV, in a wide field of view, 9.6° full FoV, making use of innovative technological solutions: a dual-mirror optics Schwarschild-Couder configuration, Leto et al. – 2nd AtmoHEAD, Padua – May 2014
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The ASTRI SST-2M telescope
The prototype … and: a compact focal plane camera (50x50x50 cm3) based on Si-PMs sensors managed by a specifically designed front-end electronics. Leto et al. – 2nd AtmoHEAD, Padua – May 2014
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The site for the ASTRI prototype
Serra La Nave (SLN) The ASTRI SST-2M telescope is an end-to-end prototype that will be tested on field. Serra La Nave The ASTRI SST-2M prototype will be placed, at the INAF ”M.G. Fracastoro” observing station located in Serra La Nave on the Etna Mountain near Catania. Latitude: ° 41’ 05” N Longitude: 14° 58’ 04” E Altitude: m a.s.l After the verification tests, devoted to probe the technological solutions adopted, the ASTRI SST-2M prototype will perform scientific observations on the Crab Nebula and on some of the brightest TeV sources … Leto et al. – 2nd AtmoHEAD, Padua – May 2014
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Monitoring the atmosphere at SLN – Auxiliary Instrumentation
The site for the ASTRI prototype Monitoring the atmosphere at SLN – Auxiliary Instrumentation Qui aggiungerei la lista della strumentazione ausiliaria a SLN, in senso lato, (Weather Station, EFM, Lidar, All-sky camera, Pludix, UVscope, …) ponendo in evidenza quella di cui tratterà la presentazione stessa. Da qualche parte c’era una slide di questo tipo … mò la cerco! Leto et al. – 2nd AtmoHEAD, Padua – May 2014
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The Electric Field Meter, EFM
Auxiliary Instrumentation at SLN The Electric Field Meter, EFM Developed by the INAF Radio Astronomy Institute (IRA), contact Federico Perini Field-Mill sensor Cettina: cambierei l’ordine; nel titolo in grigio “Auxiliary Instrumentation at SLN” (o qualcosa di simile); nel sottotitolo in rosso “The Electric Field Meter” così da evidenziare meglio (bianco su rosso) i vari strumenti. Ho cambiato così tutti I titoli e sottotitoli seguenti; come ti pare? Leto et al. – 2nd AtmoHEAD, Padua – May 2014 7
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Auxiliary Instrumentation at SLN
EFM at work Etna Eruption 23 November, 2013 Leto et al. – 2nd AtmoHEAD, Padua – May 2014 8 8 8
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Auxiliary Instrumentation at SLN
EFM – SLN alarm output Event 7 km far from station Can issue alarms NO distance/direction (3 EFM needed!) Can detect lightning distance > 7 km!! Leto et al. – 2nd AtmoHEAD, Padua – May 2014
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Auxiliary Instrumentation at SLN
Jan storm EFM – SLN output alarms Alarm bits issued from software are weighted to create an alert to ASTRI SST-2M First derivative Signal + Alarm bits Cettina: questa slide è sicuramente da completare, no? Can issue alarms NO distance/direction (3 EFM needed!) Can detect lightening distance > 7 km!! Leto et al. – 2nd AtmoHEAD, Padua – May 2014
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Auxiliary Instrumentation at SLN
Raman Lidar - AMPLE Build for the VAMOS SEGURO project by CNISM, Napoli (contact Nicola Spinelli) AMPLE characteristics Elastic channel at 355nm. Polarization measurements available. Raman channel at 386nm. Raw spatial resolution from 30cm to 30m Can be pointed from software Leto et al. – 2nd AtmoHEAD, Padua – May 2014 11 11 11
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Auxiliary Instrumentation at SLN
Raman Lidar - EARLINET Part of EARLINET since 2013: atmosphere monitoring routinely carried out. Leto et al. – 2nd AtmoHEAD, Padua – May 2014 12
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Auxiliary Instrumentation at SLN
All-Sky Camera, ASC SBIG All-Sky Camera 340C Kodak KAI-340 CCD 640x480 Exposure time 50 microseconds to 180 sec One image every five minutes Leto et al. – 2nd AtmoHEAD, Padua – May 2014 13 13 13
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ASC: Color = Bayer Filter
Auxiliary Instrumentation at SLN ASC: Color = Bayer Filter Leto et al. – 2nd AtmoHEAD, Padua – May 2014 14 14 14
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Auxiliary Instrumentation at SLN
ASC: Cloud Detection Statistics of cloud cover for the SST-2M site day and night. Support SST-2M observations. Leto et al. – 2nd AtmoHEAD, Padua – May 2014 R. Zanmar Sanchez and G. Leto – 8th ASTRI Collaboration Meeting: Marzo, 2014 15 15 15
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Auxiliary Instrumentation at SLN
ASC- Thresholding Is it right to ingore the Green channel? Usually the 3 RGB channels are turned into one: R-B or R/B (Long et al. 2006) RGB turned into HSL and L is used (Souza-Echer et al 2006) Euclidean Geometric Distance (Sylvio et al 2010) Leto et al. – 2nd AtmoHEAD, Padua – May 2014 16 16 16
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Auxiliary Instrumentation at SLN
ASC - Thresholding Principal Component Analysis Classified by eye 25,000 images into clear sky, overcast, lunar phase, sun altitude. sistema cartesiano, analisi delle componenti. Fasi lunari.coordinate altazimutali. Altitude = altezza Leto et al. – 2nd AtmoHEAD, Padua – May 2014 17 17 17
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Auxiliary Instrumentation at SLN
ASC - Thresholding Principal Component Analysis Eigenvector Eigenvalue R G B 9.2e7 0.5 0.6 1.6e6 0.7 0.1 -0.7 2.9e4 -0.5 0.8 -0.4 sistema cartesiano, analisi delle componenti. Fasi lunari.coordinate altazimutali. Altitude = altezza Leto et al. – 2nd AtmoHEAD, Padua – May 2014 18 18 18
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Auxiliary Instrumentation at SLN
ASC - Thresholding Principal Component Analysis sistema cartesiano, analisi delle componenti. Fasi lunari.coordinate altazimutali. Altitude = altezza Leto et al. – 2nd AtmoHEAD, Padua – May 2014 19 19 19
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Auxiliary Instrumentation at SLN
ASC - Thresholding sistema cartesiano, analisi delle componenti. Fasi lunari.coordinate altazimutali. Altitude = altezza Leto et al. – 2nd AtmoHEAD, Padua – May 2014 20 20 20
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Auxiliary Instrumentation at SLN
ASC - Thresholding Future work Leto et al. – 2nd AtmoHEAD, Padua – May 2014 21 21 21
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Auxiliary Instrumentation at SLN
ASC - Star Counting Find stars Note big holes in the data. Leto et al. – 2nd AtmoHEAD, Padua – May 2014 22 22 22
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Auxiliary Instrumentation at SLN
ASC - Star Counting Confront with a catalog We need an accurate transformation between pixel and celestial coordinates ZEA projection Distortions modeled with 6 order polynomial series Note big holes in the data. Leto et al. – 2nd AtmoHEAD, Padua – May 2014 23 23 23
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Auxiliary Instrumentation at SLN
ASC - Star Counting Discard Outliers Fit for the magnitude transformation Note big holes in the data. zeropoint slope Leto et al. – 2nd AtmoHEAD, Padua – May 2014 24 24 24
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Auxiliary Instrumentation at SLN
ASC - Star Counting Tiling Leto et al. – 2nd AtmoHEAD, Padua – May 2014 25
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Auxiliary Instrumentation at SLN
ASC - Star Counting Leto et al. – 2nd AtmoHEAD, Padua – May 2014 26 26 26 26
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Auxiliary Instrumentation at SLN
ASC - Star Counting Leto et al. – 2nd AtmoHEAD, Padua – May 2014 27 27 27 27
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Auxiliary Instrumentation at SLN
ASC - Star Counting Leto et al. – 2nd AtmoHEAD, Padua – May 2014 28 28 28
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Conclusions and Future Work
Auxiliary Instrumentation at SLN Conclusions and Future Work All Sky Camera: Thresholding Try extra rotation to turn problem one-dimensional Work cases with the moon in the sky Sunset and sunrise All Sky Camera: Star counting Build our own catalog EFM: Deliver real alerts to ASTRI SST-2M software (dummy software already implemented) Lidar: Data taken during ASTRI SST-2M observation will be available to define the real sky condition Leto et al. – 2nd AtmoHEAD, Padua – May 2014 29 29 29
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The ASTRI Program http://www.brera.inaf.it/astri/
Leto et al. – 2nd AtmoHEAD, Padua – May 2014
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