powering of the stave modules in the goat-1 proposal. vladimir gromov, ruud kluit, harry van der...
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Powering of the Stave modules in the GOAT-1 proposal.
Vladimir Gromov, Ruud Kluit, Harry van der Graaf.
NIKHEF, Amsterdam.
EUDET Annual Meeting, Amsterdam, the Netherlands. October 6, 2008.
Outline
V.Gromov 2EUDET-08 6/10/2008
The GOAT-1 proposal : Gossip in ATlas.
Cooling of the Stave module.
Parallel powering scheme.
Summary.
GOAT-1: GOssip in ATlas
V.Gromov 3EUDET-08 6/10/2008
Ø60mm Beampipe
Inner Layer: 7 double Goat strings
CO2 cooling channels
P-string conductor
G-string conductor
Gossip detector unit (1.4cm x 1.4cm)
~1m64 chips
The ATLAS Pixel B-Layer Replacement Proposal.
Cooling of the Stave module.
Gossip Read-out chip
(100mW/cm2)
CO2 cooling tube - diameter 0.5mm - mass flux 858kg/m2●sec
heat
Evaluations done by Bart Verlaat (NIKHEF, Amsterdam)
Power_per _stave = 1.4cm●1.4cm●128chips ●100mW/cm2 = 26W
Aluminum block- total cross-section 8.6mm2
0.3m
m
V.Gromov 4EUDET-08 6/10/2008
Goat 1 staveΔTmax=2°C
Heat transport to the cooling tube.
Aluminum block - total cross-section 8.6mm2
+10.1mm2
V.Gromov 5EUDET-08 6/10/2008
Simulations done by Bart Verlaat (NIKHEF, Amsterdam)
`
`
CO2 cooling tubes
Parallel powering scheme.
V.Gromov 6EUDET-08 6/10/2008
Consider the use of the available ALU block cross-section (S=8.6mm2).
Chip
#1
1
70
mA
PowerSupplySource1.2V
11A
1.4cm
R= 26.5●10-9 Ω●m●1.4●10-2m / 8.6●10-6m2 = 4.3 ●10-5Ω .
∆V = R●11A+ R●(11A-0.34A) + R●(11A-2●0.34A)+…+ R●0.34A = 8mV
8.6mm2
R1.2V
0V
1.192V
8mV
Power losses ≈ 0.9%
Chip
#2
1
70
mA
Chip
#3
1
70
mA
Chip
#4
1
70
mA
R
Chip
#6
3
17
0m
A
Chip
#6
4
17
0m
A
R
RRR
340mA
Chip
#6
5 1
70
mA
Chip
#6
6
17
0m
A
Chip
#1
25
17
0m
A
Chip
#1
26
1
70
mA
Chip
#1
27
1
70
mA
Chip
#1
28
1
70
mA
PowerSupplySource1.2V
11A
1.2V
0V
R R R
R R RR
R
Powering scheme with non-regularALU block.
V.Gromov 7EUDET-08 6/10/2008
Chip
#1
1
70
mA
PowerSupplySource1.2V
11A
∆V
R1.2V
0V
1.185V
15mV
Power losses ≈ 1.3%
Chip
#2
1
70
mA
Chip
#3
1
70
mA
Chip
#4
1
70
mA
R1
Chip
#6
3
17
0m
A
Chip
#6
4
17
0m
A
R2
R1R
340mA
Chip
#6
5
17
0m
A
Chip
#6
6
17
0m
A
Chip
#1
25
1
70
mA
Chip
#1
26
1
70
mA
Chip
#1
27
1
70
mA
Chip
#1
28
1
70
mA
PowerSupplySource1.2V
11A
1.2V
0V
R2 R1 R2
R
R31
R2 R31 R2 R1
∆V ∆V
R= 4.3 ●10-5Ω ∆V = R●11A●32 = 15mV
Summary.
V.Gromov 8EUDET-08 6/10/2008
The cooling system proposed for the GOAT-1project requires an Aluminum stave for heat transportation to the CO2 tube.
The Aluminum stave could also be used for the powering of the read-out electronics.
The presented analysis demonstrates that with the available amount of conductive material (aluminum) the parallel powering scheme could be successfully used.