Development of a muon radiographic imaging electronic board system for a stable solar power operation

Uchida, Tomohisa; Tanaka, Hiroyuki; Tanaka, Manobu

doi:10.5047/eps.2009.03.002

Cited by 11 publications

(10 citation statements)

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“…Each MOS consisted of a muon tracker (consisting of 2 segmented detectors as shown in Fig. 3b), high voltage (HV) supply, field-programmable-gate-array (FPGA)-based electronics for signal processing29, and data acquisition (DAQ) personal computer (PC). Each scintillation detector consisted of a plastic scintillator bar (ELJEN EJ-200), photomultiplier tube (PMT; Hamamatsu R7724), and acryl light guide.…”

Section: Resultsmentioning

confidence: 99%

“…This angular resolution corresponded to a spatial resolution of ~90 m at the peak of the 1994 spine. 28 signal outputs from each muon tracker were fed to the electronics to generate a histogram of the number of muon events as a function of azimuth and elevation angles29. The histogram was stored in a flash memory drive associated with the FPGA so that the DAQ PC could access the FPGA and download the data every minute.…”

Section: Resultsmentioning

confidence: 99%

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Instant snapshot of the internal structure of Unzen lava dome, Japan with airborne muography

Tanaka

2016

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An emerging elementary particle imaging technique called muography has increasingly been used to resolve the internal structures of volcanoes with a spatial resolution of less than 100 m. However, land-based muography requires several days at least to acquire satisfactory image contrast and thus, it has not been a practical tool to diagnose the erupting volcano in a real time manner. To address this issue, airborne muography was implemented for the first time, targeting Heisei-Shinzan lava dome of Unzen volcano, Japan. Obtained in 2.5 hours, the resultant image clearly showed the density contrast inside the dome, which is essential information to predict the magnitude of the dome collapse. Since airborne muography is not restricted by topographic conditions for apparatus placements, we anticipate that the technique is applicable to creating images of this type of lava dome evolution from various angles in real time.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Instant snapshot of the internal structure of Unzen lava dome, Japan with airborne muography

Tanaka

2016

Sci Rep

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“…Electromagnetic (EM) showers and multi-muon events are rejected by discarding events when more than one signal from the same layer (detector plane) coincides in a time gate of 100 ns (multiplicity cut). The prior experiments on muon imaging with FPGA-based (field programmable gate array) Muon Readout Module, developed by Uchida et al (2010) demonstrated the very low readout noise, high-speed event counting, and accurate timing of the acquisition frames. The readout frames can be as short as one microsecond.…”

Section: Methodsmentioning

confidence: 99%

Development of stroboscopic muography

Tanaka¹

2013

Geosci. Instrum. Method. Data Syst.

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Abstract.Conventional muon radiography has concentrated on non-destructive studies of stationary objects with relatively long exposure times required to achieve sufficient muon statistics. A muon detection system with real time readings and a high spatial resolution detector, enables the investigation of dynamic processes in a stroboscopic mode, where image frames are synchronized with the phases of the dynamic target. Although the natural cosmic ray muon flux is quite low for imaging a rapid process, repetitive processes can still be studied with high time resolution by integrating a large number of frames synchronized to the process. In this paper we demonstrate the stroboscopic imaging capabilities of cosmic ray muon radiography with scintillation counters and the muon readout module. The dynamics of a chemical and melting process in an electric furnace with a size of 30 m water equivalent in diameter was investigated as an example, and stroboscopic images were obtained for hourly changes, with acquisition frames of 400 h each. The results of these experiments demonstrate the future potential for muon radiography of repetitional process, such as magma flow in a conduit.

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“…Uchida et al (2009Uchida et al ( , 2010 developed MURG08 for non-particle physicist users. In this system, in order to increase the availability, the tracking analysis algorithm is also incorporated into FPGA so that users can monitor the single counting rate of each channel as well as the 2-D histogram of the muon counts as a function of azimuth and elevation angle only by accessing the web browser equipped on the electronics board via the internet.…”

Section: Test Measurement With the Multi-psd Systemmentioning

confidence: 99%

Possible application of compact electronics for multilayer muon high-speed radiography to volcanic cones

Tanaka

Yokoyama²

2013

Geosci. Instrum. Method. Data Syst.

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Abstract. Compact data-taking electronics were developed for high-speed multilayer muon radiography in order to minimize operation failure rates. By requiring a linear trajectory within the position sensitive detectors (PSDs), the background (BG) events produced by vertical electromagnetic (EM) showers are effectively reduced. In order to confirm the feasibility of this method, the system comprising four PSD layers was tested by imaging the internal structure of a parasitic cone and the adjacent craterlets formed in the 1910 eruption at the base of the Usu volcano, Hokkaido with a conventional (MURG08) readout system (Kusagaya et al., 2012;Uchida et al., 2009). The new mountain is believed to be a cryptodome since its formation. As knowledge on lava domes is accumulated at various volcanoes, the definition of "cryptodome" is now doubted in its validity. The results of the preliminary 290 h muon radiographic survey revealed that the "cryptodome" is not underlain by any lava mass and that a main craterlet is accompanied by magma intrusions at shallow depths. The former verifies that the new mountain is not a cryptodome but a volcanogenetic mound, and the latter interprets the phreatic explosions forming the craterlets as intrusions of magma into the aquifer. However, a higher data taking failure rate was observed with a softwarebased MURG08 system when the size of the active area of the detection system was enlarged to improve the detection ability of the system. The newly developed MURG12 is a complete electronics system that can simultaneously process signals from 192 scintillation counters with a data size of 600 kbps ch −1 without operation failure. We anticipate that the observation speed would be further improved by employing MURG12.At the base of the Usu volcano, in the 20th century, four eruptions occurred. Some of them demonstrated three characteristic stages of magma intrusions. First, a magma branch remained at a depth leaving an upheaval of the ground; second, it rose and reached aquifers causing phreatic explosions without extrusions; and third, it reacted with aquifers causing phreatic explosions and further extruded over the ground forming a lava dome. In order to clarify the eruption mechanism of Usu, it is necessary for us to image many parasitic cones. Based on the result of the test measurement, we anticipate that MURG12 would be a strong tool for high-speed muon radiography.

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Development of a muon radiographic imaging electronic board system for a stable solar power operation

Cited by 11 publications

References 10 publications

Instant snapshot of the internal structure of Unzen lava dome, Japan with airborne muography

Instant snapshot of the internal structure of Unzen lava dome, Japan with airborne muography

Development of stroboscopic muography

Possible application of compact electronics for multilayer muon high-speed radiography to volcanic cones

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