PEANUT Brick Scanning for NETSCAN by S-UTS

Kunihiro MorishimaF-Lab Nagoya University

BL118

Peanut Meeting @ Fermi Lab 2007/01/22-23

First data taking of S-UTS 2nd stage

S-UTS 2nd Stage

scanning speed : 33 cm2 / hour

Speed : 50 views / secOptics : Tiyoda 50 magnitude lensField of view 　 ： 160 x 160 micron2

Scanning step ： X:135 micron, Y:135 micron

Scanning area

35 mm

25 mm50 mm

50 mm

Stage Coordinate

X

Y

25 cm2

Prediction and Scanning Flow

12

34

56

Scanning Direction

1 prediction

lens side

stage side

10 lines

Scanning order

Ｘ

Ｙ

5mm x 1400 micron : 100 sec

Parameter of scanning

・ Angle Allowance : tan θ<= 0.4

・ Ph cutlens side ： 8 （ tan θ< 0.1 ） , 7 （ 0.1 =<

tan θ ）stage side ： 7 （ tan θ< 0.1 ） , 6 （ 0.1 =<

tan θ ）Parameter of Ph cut depends on thickness of emulsion at scanning

Thickness of Lens side is more thin than stage side about 5 micron

Film thickness at scanning

0

5

10

15

20

25

30

35

40

45

0 5 10 15 20 25

Plate No

thic

knes

s ( m

icro

n )

lens sidestage side

44 micron at exposure

Difference between lens side and stage side is about 5 micron

Plate Setting

Optics : objective lens

Emulsion

immersion oil

vacuum channel

oil fence

Scanning area

Position Distribution

pl08

Lens side 1000 trks / view

pl08

stage side

Position Distribution

2000 trks / view

Angle Distribution

Stage side

Lens side

pl06

・ Ph cut lens side ： 8 （ tan θ< 0.1 ） 7 （ 0.1 =< tan θ ） stage side ： 7 （ tan θ< 0.1 ） 6 （ 0.1 =< tan θ ）

PH Distribution

pl21

lens side stage side

Ph cut = 7 Ph cut = 6Thickness = 31 Thickness = 37

Number of Tracks in 25cm2 ( 1plate )

0

0.5

1

1.5

2

2.5

3

3.5

0 10 20 30 40 50 60 70

億

Plate No

num

ber

of t

rack

s

lens sidestage side

hundred million

1 hundred million tracks / plate

2 hundred million tracks / plate

Scanning Time

0:00

0:30

1:00

1:30

2:00

2:30

3:00

0 5 10 15 20 25

Plate NO

time

(h:m

)

Average time = 2h15min / plate

Total data taking speed

0

10

20

30

40

50

60

12/ 24 12/ 29 1/ 3 1/ 8 1/ 13 1/ 18 1/ 23

date

Pla

te N

O

1 brick / 10 days

re-scanning,Because data taking was failure

・ 25cm2 / both side / plate・ 1shift / 18h / day

checking quality of data in whole area

Position Distribution

pl08

Lens side

pl08

Distribution of Track Density Lens side

Distribution of Track Density

pl08

Stage side

Distribution of Track Density

Pattern 1 : random

Pattern2 : line

pl08

Distribution of Track Density

pl08

Pattern 1

Distribution of Track Density

185 / 140980 = 0.1%

pl08

Pattern 1

confirmed scratch pattern by eye check

Other sample

pl23

Stage side

The Ratio of the Failure of scanning

0.00001

0.0001

0.001

0.01

0.1

10 10 20 30 40 50 60 70

Plate No

Err

or R

atio

( %

)

lens sidestage side< 1 %

Distribution of Track Density

pl08

Pattern 2

Distribution of Track Density

pl08

Pattern 2

Plot of Raw Micro Tracks

average of gaps ～ 70 micron mechanical trouble caused these gaps / prediction → Dead Space is about 5 % / surface → 　 Now this trouble is corrected ( after plate No 45 )

10 line / prediction unit

After correction of mechanical trouble

pl45

Lens side

After correction of mechanical trouble

pl45

stage side

After correction of mechanical trouble

pl45

Lens side

4 prediction

No dead space of line structure

The Ratio of Dead Space

origin Dead Space

Pattern 1 Scratch << 1%

Pattern 2 mechanical trouble ( ～ pl44) 5 %

Dead Space is about 3 % of all scanned area before pl 44.But, after pl45, less than 1 %

conclusion

・ data taking speed is 10 days / both surface / 25 cm2 / brick with 1 shift / 18h / day @ 33 cm2 /h

-> 40 days / both surface / 100 cm2 / brick

・ dead space of scanning data is less than 1% depends on emulsion itself