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

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