BATATA in the Lab....
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BATATA in the Lab. PMT. y. PMT. x. Simulation parameters must be tuned with measurement. Key parameters: 1) Attenuation length by the WLS fiber 2) Light yield in the per energy deposition unit. BATATA planes response. Bicron specifications BCF-92: 1/e Length > 350 cm.  2 MeV.

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3423826

BATATA in the Lab....

PMT

y

. . .

PMT

.

.

.

x

Simulation parameters must be

tuned with measurement. Key parameters:

1) Attenuation length by the WLS fiber

2) Light yield in the per energy deposition unit


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BATATA planes response

Bicron specifications BCF-92:

1/e Length > 350 cm

2 MeV

Nphe(x) = Edep Yield(l) Ceff(l) Qeff(l) Att(x)

<k> = <Nphe(x)> / <Edep> Att(x)

<k>1Fiber = 4-6 phe/MeV

<k> 2Fibers = 5-8 phe/MeV

Att(0 cm) = 1

Yield(l) Ceff(l) Qeff(l)  k (cte)

A measure of Nphe(x0) is necessary to determine <k>


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BATATA planes response

1 Fiber at 350 cm from PMT:

Median 6.4 phe

MPV 4.6 phe

2 Fiber at 350 cm from PMT:

Median 8.5 phe

MPV 5.3 phe


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BATATA planes response

2 Fiber at 150 cm from PMT:

Median 11.0 phe

MPV 6.5 phe

Expected mean number of phe at 350 cm assuming that Nphe(150cm) is the true value:

<Nphe(350cm)>expected = Att(350cm) / Att( 150cm) <Nphe(150cm)>measured 7.8 (4.6)

( <Nphe(350cm)>expected - <Nphe(350cm)>measured ) / <Nphe(350cm)>measured  20-30%


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2 Fiber at 150 cm from PMT

2 Fiber at 350 cm from PMT

1 Fiber at 350 cm from PMT


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Towards a full understanding of BATATA planes response....

1 Fiber at 260 cm, 170 cm and 70 cm rom PMT:

Median(phe) MPV(phe)

10.36.8

6.30 4.00

5.003.19

using k = 4.2 phe/MeV

Conversion factor 1phe  25-30 QADC


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Gracias....


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