Seigo Miyamoto On the behalf of every emulsion users and developers Nuclear emulsion: the review of the recent observations and the development of technologies.

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Presentation transcript:

Seigo Miyamoto On the behalf of every emulsion users and developers Nuclear emulsion: the review of the recent observations and the development of technologies 1 Muon and Neutrino Radiography 2013, 26th June, Tokyo.

Detector : Nuclear emulsion film Muon and Neutrino Radiography 2013, 26th June, Tokyo. 2

Detector : Nuclear emulsion film No power supply Compact Good stability for hard environment, except > 30 ℃ The real-time monitoring is not available  Need development and scanning by automated readout system 150 micron microscopic image Recorded as silver grains along the line particle passed through Muon and Neutrino Radiography 2013, 26th June, Tokyo. 3

Break through in 2006 Muon and Neutrino Radiography 2013, 26th June, Tokyo. 4 Tanaka and Nakano et al., 2007

Recent observations and going-on projects by emulsion detectors 5 Muon and Neutrino Radiography 2013, 26th June, Tokyo.

6 by Miyamoto et al Unzen lava dome imaging by Miyamoto et al Detector is here Muon and Neutrino Radiography 2013, 26th June, Tokyo. Tan = rad - 30 deg Tan = rad +30 deg

7 Observed muon/Expected ratio Tan( elevation deg ) Tan( azimuth deg ) A C B The detector cannot discriminate GeV/c particle The detector cannot discriminate GeV/c particle A : Observed/Expected > 100  BG dominant B : Observed/Expected = several  BG dominant C : Observed/Expected < 1.0  It seems no BG ? Zenith = 90.0 deg Assuming the density of mountain is 2.5g/cc

8 Muon and Neutrino Radiography 2013, 26th June, Tokyo. Q. What is the BG source ? A. Low momentum particles Nishiyama et al The experimental study on background source of muon radiography using the detector which can discriminate GeV/c order momentum of the particles ( Emulsion Cloud Chamber ) was done around the Mt. Usu and showa-shinzan by Nishiyama et al. This study confirms that the source of background noise is low-momenta(<1GeV) charged particles.

by Tioukov et al. Stromboli Italy by Tioukov et al. The imaging of conduit is critical for the eruption dynamics model The preliminary image of Stromboli will be shown. 9 Muon and Neutrino Radiography 2013, 26th June, Tokyo.

by Tioukov et al. Stromboli Italy by Tioukov et al. 10 Muon and Neutrino Radiography 2013, 26th June, Tokyo. Expected diameter of the conduit is 10m or less 10m/500m = 20mrad  Very high angular resolution is needed and emulsion detector is suitable for conduit imaging Difficult to get the power supply

Mt. Tenerife, Canary Island 11 Hernandez, Padron et al Imaging the shallow part of summit cone by Hernandez, Padron et al

12 Beam of cable car building W 2.5m x D 0.3m x H 0.7m Emulsion Cloud Chambers 0.5 m 2 includes two 1mm- thick lead plates. Muon and Neutrino Radiography 2013, 26th June, Tokyo.

PROJECTS The imaging of La Palma Fault in Hernandez, Padron et al. The emulsion detector will be installed in this October. Muon and Neutrino Radiography 2013, 26th June, Tokyo.

PROJECTS The imaging of La Palma Fault in 1949 No infrastructure around this site  No power supply Expected width of the fault is 1m to 10m.  Need high resolution 14 Hernandez, Padron et al. Muon and Neutrino Radiography 2013, 26th June, Tokyo.

The technical development 15 Muon and Neutrino Radiography 2013, 26th June, Tokyo.

Large scale production of new emulsion films We have been used the emulsion films which was made more than ten years ago.They accumulate all tracks of charged particles passed through  Too many background  Need to increase threshold to recognize the track in emulsion  Muon detection efficiency decrease. Morishima et al Morishima et al are going to product the new emulsion film, which consists of very sensitive emulsion gel with the order of ~ 1 m 2 /day. 16 Muon and Neutrino Radiography 2013, 26th June, Tokyo.

QSS “Quick Scanning System” next generation’s scanning system QSS are under fine-tuning which consists of low magnification objective lens  large field of view. 4M pix high-speed camera Continuous stage moving with constant velocity. Track recognition by Multiple GPUs. 150 cm2/hour = 2.7m 2 /2plates/month/system By Bozza et al. By Bozza et al. 17 Muon and Neutrino Radiography 2013, 26th June, Tokyo.

The MONSTER readout system : “HTS” Sixteen CMOS sensors mounted in the grid discontinuously 30cm-diameter objective lens Very quick movement of XY stage with counter mass movement. Track recognition of Multiple GPUs cm2/hour = 108m 2 /2plates/month/system By Yoshimoto, Nakano, et al. By Yoshimoto, Nakano, et al. 18 Muon and Neutrino Radiography 2013, 26th June, Tokyo.

Summary 19 Emulsion detectors have been used/will be used for muon radiography due to its advantage features Recent technical development implies that the muon radiography with ~ 10m 2 effective area with BG-free (Emulsion Cloud Chamber) is promising.