UNIVERSITY OF CALIFORNIA, IRVINE A ... - IceCube Berkeley
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UNIVERSITY OF CALIFORNIA, IRVINE A ... - IceCube Berkeley

UNIVERSITY OF CALIFORNIA, IRVINE A ... - IceCube Berkeley

UNIVERSITY OF CALIFORNIA, IRVINE A ... - IceCube Berkeley

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T1<br />

laser<br />

PD<br />

t1<br />

t4<br />

(t3)<br />

t1 = laser pulse through air<br />

t2 = assorted fibers<br />

t3 = (optional) attenuator<br />

t4 = fiber propagation time<br />

t5 = ice propagation time<br />

t6 = PMT transit time<br />

t7 = cable/fiber propagation time<br />

t8 = surface electronics for OM<br />

Time used<br />

in analysis:<br />

disc. TDC Ref. time<br />

S<br />

W AMP<br />

t6<br />

t5<br />

t7<br />

t2<br />

T2<br />

disc.<br />

ADC<br />

TDC<br />

LET<br />

T = t1 + t2 + (t3) + t4 + t5 + t6 + t7 + t8 - (T1+T2)<br />

t8<br />

T1 = photo diode + el. cable<br />

T2 = electronics for ref. channel<br />

t - same for all<br />

t - different but known<br />

t - different and unknown<br />

Calibration constant: t0 = t6 + t7 +t8

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