wide field scanning k. morishima nagoya university
Post on 21-Dec-2015
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Wide Field Scanning
K. MorishimaNagoya University
Aim
Speed up of CS scanning
Method
・ wide field optics・ enlarge grains + swell emulsion
test optics
F.O.V = 154 x 115 micron2
pixel scale
x = 0.30 micron/pixel
Y = 0.24 micron/pixel
F.O.V = 317 x 240 micron2
pixel scale
x = 0.62 micron/pixel
Y = 0.50 micron/pixel
standard wide field
Tiyoda x50 oil immersion lens (N.A. = 0.85, WD = 1.2mm)
Nikon CFI Plan x50 oil immersion plane lens (N.A. = 0.90, WD = 0.4mm) + x0.5 tube lens (for format conversion) (Nikon) + x0.7 relay lens (Tiyoda)
sensor size½ inch
scanning test sample (double refresh exposed cosmic@ Gran Sasso CS facility)
cut
1. In water to remove glicelin2. gold deposit development for enlarging grains by Kubota3. swell emulsion by Naganawa
reference
30mm 92.5mm
50mm
Normal Development film @ GS
picture1 ( normal )
Thickness = 40 micron
picture2 ( enlarged )( gold deposit development )
Thickness = 60 micron
close up grain
0.3 x 0.3 square micrometer
S-UTS,UTS pixel size is about 0.3 micron
On a focal plane
0.5 micron0.8 micron
focal depth of enlarged grain
Grain size is larger , focal depth of grain is lager
Swell emulsion
The number of grains increases on a focal plane
Back ground tracks increases
Relation between focal depth and grain size
normal enlargedenlarged + swelled
grain
focal plane
focal depth of grain
difference of film
normal enlarged ratio
grain size (micron) 5.0 8.0 (x1.6)
F.D. ( / 1000mic3) 4.3+-0.4 4.6+-0.3 (~x1)
thickness (micron) 40 60 (x1.5)
Scanning test
normal
30mm 92.5mm
50mm
enlarged + swelled
1. Pick up prediction tracks (pl3-pl4-pl6)2. Search pl5 for microtracks window : dx,dy < +-10micron dthx,dthy < +-100mrad
pl3
4
5
6Exist or not
Pl 05
optics emulsionA. Standard – normalB. Wide field – normalC. Wide field – enlarged + swelled
Scan area : 1cm2
A. UTS standard optics+ normal film
Bg : /(100x100mic2)x/(100x100/mrad2)
A. micro track angular resolution
X
Y
14 mrad
13 mrad
B. Wide Field + normal film
Bg : /(100x100mic2)x/(100x100/mrad2)
B. micro track angular resolution
X
Y
21 mrad
18 mrad
C. Wide Field + enlarged grain + swelled emulsion
film
Bg : /(100x100mic2)x/(100x100/mrad2)
C. micro track angular resolution
X
Y
27 mrad
24 mrad
comparison of efficiency
Grain size efficiency Noise
Standard 1 normal 93.1+-1.4 0.1
wide field 2 normal 92.8+-1.4 0.5
wide field 2 enlarged 95.3+-1.1 0.9
X Y1 : 0.30micron/pixel , 0.24micron/pixel2 : 0.62micron/pixel , 0.50micron/pixel