lhcb f. murtas servizio elettronica g. corradi d.tagnani p.ciambrone hv_gem per lhcb m1r1 hv power...
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LHCbLHCbF. MurtasF. Murtas
Servizio elettronicaServizio elettronicaG. Corradi D.Tagnani P.CiambroneG. Corradi D.Tagnani P.Ciambrone
HV_GEM per LHCB M1R1 HV power supplyHV_GEM per LHCB M1R1 HV power supply
• IntroductionIntroduction• HV_GEM HV_GEM TechnicalTechnical specification specification• I_meter (for OPERA EXP) I_meter (for OPERA EXP) specificationsspecifications• Final crate Final crate • ConclusionsConclusions
LHCbLHCbF. MurtasF. Murtas
Servizio elettronicaServizio elettronicaG. Corradi D.Tagnani P.CiambroneG. Corradi D.Tagnani P.Ciambrone
What is an HV_GEMWhat is an HV_GEM
HV_GEM is a new device HV_GEM is a new device designed and realized at designed and realized at Frascati specifically Frascati specifically for the HV power supply of for the HV power supply of GEM detectors.GEM detectors.
This device has been This device has been presentedpresentedat “La Biodola” in May 2006 at “La Biodola” in May 2006 by Gianni Corradi. by Gianni Corradi.
LHCbLHCbF. MurtasF. Murtas
Servizio elettronicaServizio elettronicaG. Corradi D.Tagnani P.CiambroneG. Corradi D.Tagnani P.Ciambrone
TechnicalTechnical Specification Specification
One HV_GEM device contains :One HV_GEM device contains :• 7 active HV independent channels with serial 7 active HV independent channels with serial
architecturearchitecture
• 6 channels with max voltage of 700 V 6 channels with max voltage of 700 V (200 (200 A)A)
• 1 channel with max voltage of 1200 V 1 channel with max voltage of 1200 V (100 (100 A)A)
• isolation between HV and ground isolation between HV and ground (max 5 KV)(max 5 KV)
• Ripple 1 Vpp at maximum loadRipple 1 Vpp at maximum load
• power supply range power supply range 12-15 Volt12-15 Volt
• power consumption 120 mW (1.2 W at maximum power consumption 120 mW (1.2 W at maximum
current)current)
• CAN-BUS controller CAN-BUS controller
• Read and Write voltages, temperature and PS Read and Write voltages, temperature and PS
monitoringmonitoring
• First channel (G3d) readable in current (1 First channel (G3d) readable in current (1 A A
resolution) resolution)
LHCbLHCbF. MurtasF. Murtas
Servizio elettronicaServizio elettronicaG. Corradi D.Tagnani P.CiambroneG. Corradi D.Tagnani P.Ciambrone
Scheme of connectionScheme of connection
Vmax -700V
Vmax -500V
Vmax -700V
Vmax -500V
Vmax -700V
Vmax -500V
Vmax -1200V
Gnd Detector
Contr
olle
r
R
G1G1
G2G2
G3G3
LHCbLHCbF. MurtasF. Murtas
Servizio elettronicaServizio elettronicaG. Corradi D.Tagnani P.CiambroneG. Corradi D.Tagnani P.Ciambrone
HV_GEM Control PanelHV_GEM Control Panel
GEM power supplyGEM power supply
Drift’s fieldsDrift’s fields
Gap’s definitionsGap’s definitions
Voltages Voltages monitoringmonitoring
A program in Labview has been also realized for the monitoring and control purposesA program in Labview has been also realized for the monitoring and control purposes
Two prototypes have been built up to now and they have been already used on GEM chambers in Frascati
LHCbLHCbF. MurtasF. Murtas
Servizio elettronicaServizio elettronicaG. Corradi D.Tagnani P.CiambroneG. Corradi D.Tagnani P.Ciambrone
OPERA I_meter specificationsOPERA I_meter specifications
• 24 independent channels. • Sensitivity 100pA.• Precision 1% in the range 1nA to 25µA.• Isolation 5KV, no polarity measurement • Maximum drop among input-output 1.2 Volt (current independent) • The system is controlled by a microprocessor with CAN-BUS interface.
This is an evolution of the nano I meter already used by LHCb Muon group in several test beam e construction Test
LHCbLHCbF. MurtasF. Murtas
Servizio elettronicaServizio elettronicaG. Corradi D.Tagnani P.CiambroneG. Corradi D.Tagnani P.Ciambrone
Some component : Current Some component : Current SensorSensor
Floating Area 5kV max
Optical fiber digital interface
Low voltage floating generator
Bus Communication & PWR
LHCbLHCbF. MurtasF. Murtas
Servizio elettronicaServizio elettronicaG. Corradi D.Tagnani P.CiambroneG. Corradi D.Tagnani P.Ciambrone
Some component : CAN-BUS Some component : CAN-BUS ControllerController
Logarithmic Digital Decoder
CPU
Serial and CAN.BUS port communications
I/O conn.
JTAG Communication
LHCbLHCbF. MurtasF. Murtas
Servizio elettronicaServizio elettronicaG. Corradi D.Tagnani P.CiambroneG. Corradi D.Tagnani P.Ciambrone
Very low noise Power supply 100WVery low noise Power supply 100W
Fan connector
Power 220Vac
Isolation transformer
Switching Power Passive Filter
Power controller
+12V +6V
Guaranteed isolation between primary and secondary: 3.5kV
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Servizio elettronicaServizio elettronicaG. Corradi D.Tagnani P.CiambroneG. Corradi D.Tagnani P.Ciambrone
Engineering example Engineering example
LHCb EperimentElectronic service LNF
Power supply for:•Sensor•CPU•HV_GEM
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Servizio elettronicaServizio elettronicaG. Corradi D.Tagnani P.CiambroneG. Corradi D.Tagnani P.Ciambrone
LHCb M1 HV ProposalLHCb M1 HV Proposal
• 24 HV GEM : PS for LHCb M1R1
• 24 HV Output multiple connectors (or 12)
• 24 current monitor channels for G3down
• CAN-BUS communication
• Setting Voltage 24 x 7 = 168 channels
• Current limit set by trimmer (10-200 A)
• Total dimension : standard crate 3U nano I meter
24 HVGEMs modules
standard crate 3 U
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Servizio elettronicaServizio elettronicaG. Corradi D.Tagnani P.CiambroneG. Corradi D.Tagnani P.Ciambrone
ConclusionsConclusions• it has the it has the same costsame cost respect to “CAEN + passive divider” solution; respect to “CAEN + passive divider” solution;
• with the HVGEM system we are able to monitor with the HVGEM system we are able to monitor all the 7 floating voltagesall the 7 floating voltages applied to applied to each detector; each detector; with the passive divider with the passive divider only 3only 3 of them can be monitored; of them can be monitored;
• with the new system we are able to change/adjust the voltage distribution with the new system we are able to change/adjust the voltage distribution among among the three GEM foils of the detector (Vg1, Vg2,Vg3); the three GEM foils of the detector (Vg1, Vg2,Vg3); with the passive divider they are fixed once for everwith the passive divider they are fixed once for ever; ;
• the new system with 24 chs nano-ammeter can be exploited to monitor the new system with 24 chs nano-ammeter can be exploited to monitor the the discharge of the detectors; discharge of the detectors;
• the system allows to limit the currents drawn by each single GEM foil; the system allows to limit the currents drawn by each single GEM foil; with the passivie divider this is not possiblewith the passivie divider this is not possible. .
• the transfer fields (the fields applied on the GEM gaps, between GEM the transfer fields (the fields applied on the GEM gaps, between GEM foils) produced foils) produced inside the detectors by the HVGEM can be kept constant also when gain inside the detectors by the HVGEM can be kept constant also when gain is changed is changed by increasing the voltage applied to GEM foils. by increasing the voltage applied to GEM foils. This feature is of course not present in the HV divider solutionThis feature is of course not present in the HV divider solution; ;