Test exposure analysis Track density Angular distribution Developing time

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

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 2011 - Schedule   MONDAY TUESDAY WEDNESDAY THURSDAY FRIDAY SATURDAY SUNDAY 20.06 21.06 22.06 23.06 24.06 25.06 26.06 20 - 27 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 28 - 29 JUNE PARASITIC ONLY: POLI CR39 POLI SI detector PARASITIC IN ADDITION AS MAIN USER: Target under CONCRETE Target under IRON

target Top view p, p

Track density

Emulsion view proton tracks ++ 300 micron x 200 micron

Proton stop 200 x 200 microns

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.

Tref (No exposure) Noise Protons Cut MIP

T3-3 (10min) Noise Protons Cut MIP

T2-3 (30 min) Noise Protons Cut MIP

T1-3 (10hours) Noise Protons Cut MIP

Comparison

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

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

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.)

Developing time Tuning

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

T1-3 25min Noise Protons Cut MIP

T1-3 20min

T1-3 15min

T1-3 10min

Developing time

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

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.

Real exposure scanning of real module to be done neutrons 25 x emulsion 95 x emulsion + 0.5 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

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

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