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Status of automatic scanning and vertex recognition at Toho Univ.
September 27, 2014 @ Gyeongsang National UniversityH. Shibuya, S. Ogawa, S. Fukunaga, T. Fukuda, T. MatsuoToho University
1. Emulsion Scanning System at Toho University2. Study of lambda hypernuclei (KEK E373 & J-PARC E07) Status of automatic scanning and vertex recognition
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1. Scanning system of our laboratoryAutomatic scanning system1) Nikon L-Mic equipped with Ultra Track Selector (UTS)2) Nikon L-Mic equipped with SONY XC-HR300 system 7
and LED lighting system (Uniopt) Auto Stage II3) Nikon L-Mic equipped with MIKROTRON EoSens MC1362 (and LED lighting system (Uniopt), FTS) system 11
Semi-automatic scanning system4) Nikon-L-Mic equipped with C3077 system 10
controlled by WinRT Auto Stage I5) Mitaka 17cm*17cm controlled by DOMS6) Mitaka 40cm*50cm controlled by DOMS
system 9
3
FTS to detect large angle tracks system 11
FTS
T. Fukuda et al., JINST 8 (2013) P01023Detection efficiency of MIP base tracks vs. tan
Microscope view of a film Cross-sectional view of a film
Automatic scanning of emulsions with wide-angle acceptance Track recognition algorithm
Efficiency> 90%
2. Status of automatic scanning and vertex recognition at Toho Univ.
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Present activity for hypernucleus studies at Toho University
Automatic general/overall scanning is being performed in order to detect hypernuclei in KEK E373 emulsion plates.
Procedure to search for hypernucleus events
① Emulsion plates of E373 are scanned by an automatic general/overall scanning system.
② Images which have at least one vertex are extracted by an image processing program.
③ Images which have two vertices are selected in extracted imagesby visual inspection
④Real emulsion plates are placed on a microscope stage and checked in order to confirm whether there are two vertices by visual inspection.
by S. Fukunaga (M2)
2. Status of automatic scanning and vertex recognition at Toho Univ.
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XC-HR300(sony)
Frame rate 100Hz
Camera for System7 Specification
OS Windows2000 professional
CPU 1.70GHz
Memory 256MB
PC for System7 Specification
system 10
system 7
6
① Outline of automatic general/overall scanning
emulsion
X-Y plane
Y
x
1 Set
Scan Saveemulsion
emulsionZ
x
base
120 μm
X-Z plane
250
μm・ The microscope stage is moving continuously not only along the z direction but also along the x direction ・ Tomographic image data are taken while the camera goes down and they are saved while the camera goes up.・ 84 image data are acquired in 1 set .
330 mm
330 mm
Overlap:20 μm
・ The number of fields of view (1 view:0.12×0.1mm2) X:3300 Y : 4100・ Size of emulsion plates
・ E07 : 350×350mm2
・ E373:250×245mm2
Total : 13.000.000
7
② Analysis of acquired images
1. Resolution reduction2. Increase the contrast3.Homogenizaton of background by Gaussian Filter4.Filterring5.binarization6.Noise elimination7.thinning8.Hough transformation9.Detection of vertex
2. Detect vertex
Tomographic mages are acquired by the automatic general scanning. images which have a vertex are extracted by an image processing program.
5 layers
5 layers
5 layers
1. Superimpose 5 tomographic images
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Analysis procedure and event classification
Extracted images Images which have two vertices
Other images
Interesting eventsCheck images Check emulsion③ ④
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Automatic scanning and checking images
・ module#87, plate#: 6, 7・ module#88, plate#: 6, 7・ module#89, plate#: 6, 7・ module#84, plate#: 6, 7・ module#83, plate#: 6, 7・ module#38, plate#: 6, 7・ module#85, plate#: 6, 7・ module#35, plate#: 6, 7・ module#41, plate#: 6, 7・ module#44, plate#: 6, 7
We scanned an area of 15 × 15 mm2 at the center part in each emulsion plate.
So far 16 emulsion plates have been scanned and analyzed.
Green: all the processes have been completed including checking emulsion plates. Red: scanning has been finished but checking images has not been finished yet.
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Number of events checked in emulsion plates
mod35pl6mod35pl7
mod38pl6mod38pl7
mod41pl6mod83pl6
mod83pl7mod84pl6
mod85pl6mod85pl7
mod87pl6mod87pl7
mod88pl6mod88pl7
mod89pl6mod89pl7
0
5
10
15
20
25
30
35
40
45
50
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Ratio = number of events checked in emulsion/ number of images extracted by image processing
mod35pl6mod35pl7
mod38pl6mod38pl7
mod41pl6mod83pl6
mod83pl7mod84pl6
mod85pl6mod85pl7
mod87pl6mod87pl7
mod88pl6mod88pl7
mod89pl6mod89pl7
0
0.001
0.002
0.003
0.004
0.005
0.006
0.007
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Status of scanning and analysis
・ Total volume of emulsion where events with a second. vertex were searched for : 1.5 cm×1.5 cm×0.025 cm ×16 plates = 0.9 cm3
・ Number of images extracted by image processing: 116155
・ Number of events checked in emulsion: 299
・ Number of events associated with a second. vertex : 42 Classification ・ Beam interaction : 27
・ hammer track: 4・ Absorption of a Xi particle: 10・ Other
( it looks like a beam interaction but no incident beam ) : 1
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Summary1) We have 3 scanning systems, each has a different feature. ・ L-Mic stage with C3077, WinRT (Auto stage I) system 10
・ L-Mic stage with XC-HR300 & LED (Auto stage II) system 7
・ L-Mic stage with FTS, MC1362 (& LED) system 11
2) Automatic scanning and vertex recognition using E373 emulsion plates are now in progress.
・ An area of 15 mm x 15 mm of 16 E373 emulsion plates has been scanned and processed to search for hyper-nucleus events.
・ 42 multi-vertex events have been found.
・ Statistics will be doubled in 4 months.
Fine Track SelectorWide-angle acceptance