3/18/2002 1
Update on DHC elements testing.
Task force: A. Dyshkant, M.Martin, V. Rykalin
V. Rykalin
3/18/2002 2
PMT for measurements
3/18/2002 3
PMT Quantum Efficiency
3/18/2002 4
Extruded scintillator,emission intensity versus wavelength.
3/18/2002 5
BC 408, emission intensity versus wavelength.
3/18/2002 6
BCF 92, absorption end emission versus wavelength
3/18/2002 7
Fiber transparency versus loop radius (V. Makeev measurements)
3/18/2002 8
Elements tested
3/18/2002 9
Hexagonal, machined at NIU, BC-408,1mm BCF-92, N=1.8 P.E.
3/18/2002 10
BC-404, 1cm thickness,1.2 mm fiber BCF 92 N=9.6 P.E. Reflective end
3/18/2002 11
Extruded MINOS,0.9 cm thickness, 1 mm BCF-92 N=3.7 P.E., two ends.
3/18/2002 12
Final results
Material/Thick. FiberDiam./Activelength
Reflective Yes/No
Number of PE:normalization to thesame diameter,thickness, activelength ,reflection(1 mm, 10 mm, 100 mm)
Extruded, 100cm / 9 mm(grooved in themiddle 1 mm deep)
1/40 yes 3.7(9.2)
BC-404/10 mm
2 year old(grooved in themiddle 1 mm deep)
1/142 yes 9.6(5.6)
BC-408/9 mmNIU machinedGrooved with R=1.5cm, 1mm deep
1/100 no 1.8(2.9)
3/18/2002 13
Possible improvements for NIU9 mm thickness,10 cm fiber active
length
• Deeper grooving ~ 1.3• Reflective coating ~ 1.5• Machining optimization ~ 2-4• VLPC QE=60% ~ 4• MRS 30% ~ 2• TOTAL (VLPC) 15.6 -31.2 P.E.
TOTAL (MRS) 7.8 -15.6 P.E.• After attenuation and optical
connectors ~ 4 times less
3/18/2002 14
VLPC, 0.9 cm, 2 optical connectors, 0.5 mm fiber BCF-92 N=6 P.E.
Ch21,7.5K,6.2V,3.9V,near end
0
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60
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1 59 117 175 233 291 349 407 465 523 581 639 697 755 813 871 929 987