PEANUT Brick Scanning for NETSCAN by S-UTS Kunihiro Morishima F-Lab Nagoya University BL118 Peanut Fermi Lab 2007/01/22-23

First data taking of S-UTS 2 nd stage

S-UTS 2 nd Stage scanning speed : 33 cm 2 / hour Speed : 50 views / sec Optics : Tiyoda 50 magnitude lens Field of view ： 160 x 160 micron 2 Scanning step ： X:135 micron, Y:135 micron

Scanning area 35 mm 25 mm 50 mm Stage Coordinate X Y 25 cm 2

Prediction and Scanning Flow 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 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 ） 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 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 sidestage side Ph cut = 7 Ph cut = 6 Thickness = 31 Thickness = 37

Number of Tracks in 25cm 2 ( 1plate ) hundred million 1 hundred million tracks / plate 2 hundred million tracks / plate

Scanning Time Average time = 2h15min / plate

Total data taking speed 1 brick / 10 days re-scanning, Because data taking was failure ・ 25cm 2 / 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 / = 0.1% pl08 Pattern 1 confirmed scratch pattern by eye check

Other sample pl23 Stage side

The Ratio of the Failure of scanning < 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 originDead Space Pattern 1Scratch<< 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 cm 2 / brick with 1 shift / 18h / 33 cm 2 /h -> 40 days / both surface / 100 cm 2 / brick ・ dead space of scanning data is less than 1% depends on emulsion itself