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

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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

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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

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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 images extracted by image processing

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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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Interesting events (beam interactions)

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Interesting events (beam interactions)

Interesting events (beam interactions)

16

17

Interesting events (beam interactions)

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Interesting events (beam interactions)

19

Interesting events (hammer track)

20

Interesting events (absorption of a Xi particle)

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Interesting events (absorption of a Xi particle)

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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