Temperature rise of SVD2 IR beampipe during single beam study
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Temperature rise of SVD2 IR beampipeduring single beam study
Samo Stanič, SVD Meeting 2003/10/30
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Single beam study
LER Imax=1A, imax=0.84 mA nb = 1187 bunches(1 train, fill pattern 10x4+1x5)
HER Imax=0.6A, imax=0.805 mA nb = 745 bunches (16 trains, fill pattern 10x4+1x5, gap 120 buckets)
HOM power estimate in Be
PHOM = kl I2 / (fb nb) = kl i2 nb / fb
fb = 100 kHz kl (Be) = 0.01-0.02 V/pC (ABCI est. for BL=6mm)
Pgen(LER)= 85-170W Pgen(HER) = 50-100WPmax(LER)= 4-9W Pmax(HER) = 2-5W (assuming max 5% goes into heat)
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SVD2 IR beampipe temp. sensors
6 sensors on Be
4 sensors on manifolds
7 sensors in BWD(incl. 1 on and 1 behindCu Cooling block)
8 sensors in FWD(incl. 1 on and 1 behindCu Cooling block)
24 7
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On cooling block
On manifold
On Be
Behind cooling block
RTD Around the manifold
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RTD under BWD mask
RTD behind BWDCu block
RTD on Be staggered in phi(2 are hidden)
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Locations of temp. sensors on the beampipe:full phi and z coverage
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We know exact temperatures of paraffin before and after Be(in the both manifolds)
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T(I) =Tconst +dT(I)
T(ILER)= 0.2+0.3 I2T(IHER)= 0.2+0.6 I2
dT(ILER= 1A)=0.3 deg dT(ILER=1.8A)=1.0 deg dT(ILER=2.5A)=1.9 deg
dT(IHER=0.6A)=0.2 deg dT(IHER=1.2A)=0.9 deg dT(IHER=1.5A)=1.4 deg
Quadratic fit of the temperature difference betweenin- and out-flowing paraffin
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Heat deposit in Be:
dTLER=0.3 deg dTHER=0.2 deg
dm/dt=0.88kg/min (1.1l/min) Cp=2300kJ/kg/K
P=dm/dt * Cp * dT Pmeas(LER) = 10W P[W]=34 * dT [K] Pmeas(HER) = 7W
If we extrapolate dT(I):
Pext(ILER=2.5A) = 65W Pext(IHER=1.5A) = 50W
The fit of present data is close to design value for Be (100W)
Single beam study with larger currents would help…
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Be pipe LER side(paraffin inlet)
Tmp(11): beampipez=101mm from IP
LER 1A/HER 0.6AdT=0.28 degLER 1.8A/HER 1.2AdT=0.72 deg LER 2.5A HER 1.5AdT=1.19 deg
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Be pipe HER side(paraffin outlet)
Tmp(28): beampipez=-54mm from IP
LER 1A/HER 0.6AdT=0.5 degLER 1.8A/HER 1.2AdT=1.8 deg LER 2.5 HER 1.5AdT=3.17deg
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Hot spot LER side
Tmp(7): beampipez=160mm from IP(after Cu cooling block)
LER 1A/HER 0.6AdT=3.6 degLER 1.8A/HER 1.2AdT=12.5 deg LER 2.5 HER 1.5AdT=22.1 deg
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Hot spot HER side
Tmp(24): beampipez=-105mm from IP(after Cu cooling block)
LER 1A/HER 0.6AdT=1.8 degLER 1.8A/HER 1.2AdT=10 deg LER 2.5 HER 1.5AdT=18.5deg