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LV and HV for M1 R1 Muon. Low Voltage requirements final layout High Voltage requirements prototype cabling. VME DAQ. GEM Chamber. Tracking system. LNF Cosmic test setup. In this setup we are testing : HV passive divider HV cabling (50 m cable) LV cabling LV distributor - PowerPoint PPT Presentation
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F. Murtas LNF/INFN Cagliari 5 May 2006
LV and HV for M1 R1 Muon
Low Voltage requirements final layout
High Voltage requirements prototype cabling
F. Murtas LNF/INFN Cagliari 5 May 2006
LNF Cosmic test setup
In this setup we are testing :
•HV passive divider•HV cabling (50 m cable)
•LV cabling•LV distributor•LV regulator
with “final” readout with VME scalers and tdcs
GEM Chamber
Trackingsystem
VME DAQ
F. Murtas LNF/INFN Cagliari 5 May 2006
Low Voltage System
Power consumption/board = 0.5ASupply voltage =2.5V
24 FEE boards /chamber 3 FEE boards / regulator 8 regulators /chamber
Tests has been performed with linear Power Supply : in LHCb we have to go to rad tol regulator(STM-CERN design) same as for LHCb wire-chambers
FEE Boards are fed with LV distributor board (not in series !)
First prototype of LV distributor done and under test on LNF cosmic setup
F. Murtas LNF/INFN Cagliari 5 May 2006
FEE boards around chamber
F. Murtas LNF/INFN Cagliari 5 May 2006
Low Voltage layout
lv distribution
board
regulatorand sensing
5 m
Linear Power Supply
30 m
F. Murtas LNF/INFN Cagliari 5 May 2006
Faraday Cage
Faraday cage prototype done and production started
brass (400 m)
FC alignment donewith special toolrespect toreference holes
flat cables from LV distributor
F. Murtas LNF/INFN Cagliari 5 May 2006
HV requirements
So far: 7 HV channels/gap: the easiest and the most expensive but very dangerous in case of a trip at least the GEMs should be together
Requirements:1. stay in plateau with 10 μA in the detector in LHCb2. limit power consumption 3. protect GEMs in case of sparks4. monitor current in the detector
a candidate solution with 3 dividers and 3 commercial power supplies (CAEN)
HV divider (simulated by Cagliari; realized by LNF): first prototype: high dissipation on a resistor of the G2 divider stage, leading to a change in the resistor value
second prototype: test done and ok ready for production
F. Murtas LNF/INFN Cagliari 5 May 2006
HV cabling inside the chamber
Studies on HV connectors (commercial one have Teflon)
F. Murtas LNF/INFN Cagliari 5 May 2006
HV Gem divider
-3880
-2830
-2390
-2040
-1610
-910
-500
g2
g1
50 50
2.2 nF
5 5
10 nF
5 5
nF
g3
6 Inputs14 Outputs
6kV/200A
4kV/2mA
1.3kV/10mA
Divider made of Al2O3 with dissipating bottom layer and trimmed serigraphic resistors
current monitor
F. Murtas LNF/INFN Cagliari 5 May 2006
Divider Measurements
Currents on divider Transfer fields
working point
mA
F. Murtas LNF/INFN Cagliari 5 May 2006
Divider Measurements
GEM Voltages
working point
F. Murtas LNF/INFN Cagliari 5 May 2006
HV System architecture“Standard” (non Rad-Tol) HV system with long HV lines (72 HV lines)
– 1 SY1527 mainframe– 2 A1832N HV modules– 1 A1535N HV module– 2 A1738N HV modules– SHV-to-multiconductor patch panels
SY
15
27
S
ys
tem
Ma
infr
am
e
SHV-to-multiwireHV PP
72 SHV2-5 m
F. Murtas LNF/INFN Cagliari 5 May 2006
HV cableLong distance cable
– 18 conductors shielded cable from tecnikabel• 4.5 kV nominal voltage• 1.685 euro/m (for a minimum of 2000 m)
– Number of cable doubled for future upgrade• 6(+2) cables from local patch panel to M1 cavern patch panel side A• 6(+2) cables from local patch panel to M1 cavern patch panel side C
SY
15
27
S
ys
tem
Ma
infr
am
e
Local HV PP
72
M1 PP side A
M1 PP side C
long distance cables
2-5 m
60 m
5 m