WG-3 summaryCS scanning

People• O.Sato Nagoya• Y.Nonoyama Nagoya• S.Miyamoto Nagoya• J.Yoshida Nagoya• 　　　　 T.Fukuda Nagoya • T.Nakano Nagoya• S.Aoki Kobe

• Luigi Salvatore Esposito LNGS• Giovanni DeLellis Napoli• Artem Chukanov Dubna• Yury Gornushkin Dubna• Cazes Antoine INFN• Yves Declais Lyon• Carlo Gustavino LNGS• Rosa Anna Fini Bari

Discussed

• Compton(beta ray) alignment

• TT display tools CS and ECC wrong association?

• CS feedback method

request to Extract/ Development

Neutrino events

• 38 events 19 Euro : 19 NGY

• Not found cs : 3 + 2 High Fog(LNGS) ,3(NGY)• Brick connect 11(Euro), 11(NGY)

• Vertex confirmed 8(Euro), 7(NGY)

Detection ofposition

displacement peak of beta-ray

-Take all combination of dx in ~+-100um

- Angle allowance is FREE.

2.1um 1.8um

Application for the OPERA CSD

• Alignment accuracy is less than 1um.• Effective to reject BG tracks very

much.

Samples :

Cosmic run events ---- 26 CSDs

Neutrino events ---- 32 CSDs

40 um20um in delta position space

Plot vector as the center of peak in each unit area on the film map -> Relative Distortion map.

Continual area ratio of CSDs

sucessful

sucessful

The reason of below 90%

• Not enough beta-rays to align.

---- 1

• Peak is detected, but double.

---- 5

• Large Gap exists.

---- 1

Examples , Double Peak

Examples , Large Gap is Detected.

Summary• Beta-ray alignment was applied to real OPE

RA Experiment.• The number of beta-ray for alignment is eno

ugh.• We estimated mechanical tightness. 26/32

CSDs is aligned successfully. 5/32 CSDs have Double Peaks, these are recoverable by detection both (We have 2 alignments, BG Doublet tracks become twice).

1/32 CSD has large (more than 100um) gap, we can detect it.

• We continue the study of these 6 events.

Standerd Doublet Selection:A

Hold 4 /4Position difference <20um (Xray alignment)Angle difference 15mrad

Pulse height Vol. >4 && 200< for All microtracks

Reject noise near edgeReject noise near Xraymark

17868408936564

17926415120122

18027794533540

1793515161429

1810223315420

18154300753486

18224511440953

18738109040742

18283096734406

18056003416918

19189406651264

19189406650855

19198783734841

19189406654963

18266415617023

19184311739031

18724955616660

19184311739030

18265782041586

18348391435556

18348391431639

18348391431638

18123483534672

18056003416969

18056003414850

18265782041613

18056003416919

18265782041641

18705231538537

135

8

104

11

77

8

3

30

2

17

14

36

32

6

3

3

1110

2

5

327

6

22

0

0

1

6

2

1

174

17868408936564

17926415120122

18027794533540

1793515161429

1810223315420

18154300753486

18224511440953

18738109040742

18283096734406

18056003416918

19189406651264

19189406650855

19198783734841

19189406654963

18266415617023

19184311739031

18724955616660

19184311739030

18265782041586

18348391435556

18348391431639

18348391431638

18123483534672

18056003416969

18056003414850

18265782041613

18056003416919

18265782041641

18705231538537

TrackFound

TrackFound

TrackFound

TrackFound

TrackFound

TrackFound

TrackFound

TrackFound

TrackFound

TrackFound

TrackFound

TrackFound

TrackFound

TrackFound

TrackFound

TrackFound

TrackFound

Penetrating track 32

straight track 28

Curving Track 4

Chance coincidence 66

Xray alignment

Βray alignment

TT display tools

• Alignment correction is important

Brick position for display

Mouse based track fitting helps for complicated events, NC etc.

CS and ECC wrong association?

Event 179312944, brick 11847

Proposal

• Change CS Xray mark pattern event by events

CS feedback method

• Request to extract/ development

• Easy to access

• DB based (user interface ? WEB) Working group(O.Sato,C.Bozza,L.Esposito)

should start to realize this. BMM

END

Some Samples

Some Samples

Some Samples

At first, division of area (5mm x 5mm)

Estimation of successful area• Continuity check is suitable which beta-ray alignment is

success or not because distortion should be continual.

-Check the difference of vector between adjacent area.

-For example,

d(dX)(a,b)=dXb-dXa

- if d(dX) < 10umfor >=2 adjacent areas, “a” is defined as continual(successful).

b

a c

d

e