1. Wide Field Scanning K. Morishima Nagoya University

2. Aim Speed up of CS scanning Method ・ wide field optics ・ enlarge grains + swell emulsion

3. test optics F.O.V = 154 x 115 micron 2 pixel scale x = 0.30 micron/pixel Y = 0.24 micron/pixel F.O.V = 317 x 240 micron 2 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 size ½ inch

4. scanning test sample (double refresh exposed cosmic@ Gran Sasso CS facility) cut 1. In water to remove glicelin 2. gold deposit development for enlarging grains by Kubota 3. swell emulsion by Naganawa reference 30mm92.5mm 50mm Normal Development film @ GS

5. picture1 ( normal ) Thickness = 40 micron

6. picture2 ( enlarged ) ( gold deposit development ) Thickness = 60 micron

7. 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

8. 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

9. Relation between focal depth and grain size normal enlarged enlarged + swelled grain focal plane focal depth of grain

10. difference of film normal enlargedratio grain size (micron)5.08.0(x1.6) F.D. ( / 1000mic 3 )4.3+-0.44.6+-0.3(~x1) thickness (micron)4060(x1.5)

11. Scanning test normal 30mm92.5mm 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 6 Exist or not Pl 05 optics emulsion A. Standard – normal B. Wide field – normal C. Wide field – enlarged + swelled Scan area : 1cm 2

12. A. UTS standard optics + normal film Bg : /(100x100mic2)x/(100x100/mrad2)

13. A. micro track angular resolution X Y 14 mrad 13 mrad

14. B. Wide Field + normal film Bg : /(100x100mic2)x/(100x100/mrad2)

15. B. micro track angular resolution X Y 21 mrad 18 mrad

16. C. Wide Field + enlarged grain + swelled emulsion film Bg : /(100x100mic2)x/(100x100/mrad2)

17. C. micro track angular resolution X Y 27 mrad 24 mrad

18. comparison of efficiency Grain sizeefficiencyNoise Standard 1 normal93.1+-1.40.1 wide field 2 normal92.8+-1.40.5 wide field 2 enlarged95.3+-1.10.9 X Y 1 : 0.30micron/pixel, 0.24micron/pixel 2 : 0.62micron/pixel, 0.50micron/pixel