1. Test exposure analysis
Track density
Angular distribution
Developing time

2. Emulsion film by FUJI Film
Emulsion Layer (44micron)
A minimal detector
AgBr Cristal,
Size = 0.2micron
Detection efficiency
= 0.16/crystal
1013 channels in a film
Plastic Base (205micron)
Emulsion Layer
Cross-sectional view (SEM)
Intrinsic resolution　50nm
Deviation from linear-fit line. (2D)
sensitivity 36grains/100micron
π-10GeV/c
Electron ～100keV
20μm
2009/6/10 2 2

3. CERF run June 2011 - Schedule
CERN neutron exposure
22nd, 23rd June : Test exposure
23th : Development
24th : Analysis and decision of exposure scheme
25th : Real exposure
CERF run June Schedule
MONDAY
TUESDAY
WEDNESDAY
THURSDAY
FRIDAY
SATURDAY
SUNDAY
20.06
21.06
22.06
23.06
24.06
25.06
26.06
JUNE
00h - 08h
IRSN BSS
V. Lacoste. G. Hubert, A. Cheminet, V. Faure
BACKUP
CERN BIOREM
F. Malacrida
CERN BSS
C. severino, M. Silari, G. Manessi, F. Pozzi, N. Charitonidis
08h - 16h
CERN MPX
C. Severino, M. Silari
POLI Bi
POLI Lupin
M. Caresana, G. Manessi
S. Agosteo, M. Lorenzoli
16h - 00h
INFN GEM
F. Murtas, S. Puddu, C. Severino, M. Silari
BERN Emul
P. Scampoli, S. Braccini, A. Ariga, A. Ehtesham, F. Giacoppo
27.06
28.06
29.06
JUNE
PARASITIC ONLY:
POLI CR39
POLI SI detector
PARASITIC IN ADDITION AS MAIN USER:
Target under CONCRETE
Target under IRON

4. target
Top view
p, p

5. Track density

6. Emulsion view
proton tracks ++
300 micron x 200 micron

7. Proton stop
200 x 200 microns

8. Scanning T1-3, T2-3, T3-3, TRef (-3 = most downstream plates)
TRef is not really reference for cosmic ray. it stayed at Bern.
Microscope 2
angular acceptance : tan(q)<1.2 (OPERA scanning = tan(q)<0.6)
cutoff : similar to OPERA, decided by using TRef
light level is tuned film by film.
scanning time: 4~15 min per 5mm x 5mm
Dry objective lens
20cm2/h
5 microscopes with automatic plate changers in Bern.

9. Tref (No exposure)
Noise
Protons
Cut
MIP

10. T3-3 (10min)
Noise
Protons
Cut
MIP

11. T2-3 (30 min)
Noise
Protons
Cut
MIP

12. T1-3 (10hours)
Noise
Protons
Cut
MIP

13. Comparison

14. Emulsion-PIC counts linear correlation
offset of 230 tracks,,, due to cosmic rays.

15. Track density cut && W>=28 Track Density Comment T1 12768
~ 5 x 104 /cm2
Rather high
good for high statistics analysis T2
1134
~ 5 x 103 /cm2
good for reconstruction T3
511
~ 2 x 103 /cm2
good but need bigger scanning area.
TRef 53
Real exposure

16. Angular distribution ~0.9rad Clear dependence on exposure position
Top view
~0.7rad
p, p
Side view
~0.4rad
| T12 | T11 | T10 | T9 |
~1.9m
1.9m
p, p
(difference of statistics is that of exposure time.)

17. Developing time Tuning

18. Developing time = Gain Signal Noise Developing time Developing time
Define the best developing time both on Signal and Noise.

19. T1-3 25min
Noise
Protons
Cut
MIP

20. T1-3 20min

21. T1-3 15min

22. T1-3 10min

23. Developing time

24. Developing time and NTracks
OPERA standard
20 minutes
good enough
Signal
(W>=28)
Noise

25. Summary Neutron signal is clearly seen.
with 1 hour, 10 hour exposure, we can do analysis with less scanning load.
Angular distribution is well understandable from target position
developing time of 20 min is good.

26. Real exposure scanning of real module to be done
neutrons
25 x emulsion
95 x emulsion mm plastic target
for detail analysis
for range analysis
scanning of real module to be done
scanning of the first 25 emulsion is done waiting for analysis
the rests are to be scanned
dedicated reconstruction program for large angle tracks

29. Boron plate 10B ~ 20% 11B ~ 80% Boron plate 3800barn Emulsion plate
Plastic base
Boron powder

30. Scanning T1-3, T2-3, T3-3, TRef (-3 = most downstream plates)
TRef is not really reference for cosmic ray. it stayed at Bern.
Microscope 2
angular acceptance : tan(q)<1.2 (OPERA scanning = tan(q)<0.6)
cutoff : similar to OPERA, decided by using TRef
light level is tuned film by film.
scanning time: 4~15 min per 5mm x 5mm
data in
/terabig/scan/MICROSCOPE2/ONLINE/b300001/T1-3_20min
/terabig/scan/MICROSCOPE2/ONLINE/b300001/T2-3_20min
/terabig/scan/MICROSCOPE2/ONLINE/b300001/T3-3_20min
/terabig/scan/MICROSCOPE2/ONLINE/b300001/TRef_20min
working directory
/terabig/scan/MICROSCOPE2/ONLINE/b300001/work