Post on 05-Feb-2016
description
Temperature rise of SVD2 IR beampipeduring single beam study
Samo Stanič, SVD Meeting 2003/10/30
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)
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
On cooling block
On manifold
On Be
Behind cooling block
RTD Around the manifold
RTD under BWD mask
RTD behind BWDCu block
RTD on Be staggered in phi(2 are hidden)
Locations of temp. sensors on the beampipe:full phi and z coverage
We know exact temperatures of paraffin before and after Be(in the both manifolds)
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
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…
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
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
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
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