LV and HV for M1 R1 Muon

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


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


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


FEE boards around chamber


Low Voltage layout

lv distribution

board

regulatorand sensing

5 m

Linear Power Supply

30 m


Faraday Cage

Faraday cage prototype done and production started

brass (400 m)

FC alignment donewith special toolrespect toreference holes

flat cables from LV distributor


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


HV cabling inside the chamber

Studies on HV connectors (commercial one have Teflon)


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


Divider Measurements

Currents on divider Transfer fields

working point

mA


Divider Measurements

GEM Voltages

working point


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


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

LV and HV for M1 R1 Muon

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