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HV_GEM per LHCB M1R1 HV power supply • • • • • Introduction HV_GEM Technical specification I_meter (for OPERA EXP) specifications Final crate Conclusions LHCb F. Murtas Servizio elettronica G. Corradi D.Tagnani P.Ciambrone What is an HV_GEM HV_GEM is a new device designed and realized at Frascati specifically for the HV power supply of GEM detectors. This device has been presented at “La Biodola” in May 2006 by Gianni Corradi. LHCb F. Murtas Servizio elettronica G. Corradi D.Tagnani P.Ciambrone Technical Specification One HV_GEM device contains : • 7 active HV independent channels with serial architecture • 6 channels with max voltage of 700 V (200 mA) • 1 channel with max voltage of 1200 V (100 mA) • isolation between HV and ground (max 5 KV) • Ripple 1 Vpp at maximum load • power supply range 12-15 Volt • power consumption 120 mW (1.2 W at maximum current) • CAN-BUS controller • Read and Write voltages, temperature and PS monitoring • First channel (G3d) readable in current (1 mA resolution) LHCb F. Murtas Servizio elettronica G. Corradi D.Tagnani P.Ciambrone Scheme of connection Vmax -1200V G1 Vmax -500V Vmax -700V G2 Controller Vmax -700V G3 R LHCb F. Murtas Vmax -500V Servizio elettronica G. Corradi D.Tagnani P.Ciambrone Vmax -500V Vmax -700V Gnd Detector HV_GEM Control Panel A program in Labview has been also realized for the monitoring and control purposes GEM power supply Drift’s fields Gap’s definitions Voltages monitoring Two prototypes have been built up to now and they have been already used on GEM chambers in Frascati LHCb F. Murtas Servizio elettronica G. Corradi D.Tagnani P.Ciambrone OPERA I_meter specifications This is an evolution of the nano I meter already used by LHCb Muon group in several test beam e construction Test • • • • • • 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. LHCb F. Murtas Servizio elettronica G. Corradi D.Tagnani P.Ciambrone Some component : Current Sensor Low voltage floating generator Bus Communication & PWR Floating Area 5kV max Optical fiber digital interface LHCb F. Murtas Servizio elettronica G. Corradi D.Tagnani P.Ciambrone Some component : CAN-BUS Controller JTAG Communication I/O conn. Logarithmic Digital Decoder CPU LHCb F. Murtas Serial and CAN.BUS port communications Servizio elettronica G. Corradi D.Tagnani P.Ciambrone Very low noise Power supply 100W Fan connector Power controller +12V +6V Power 220Vac Isolation transformer Switching Power Passive Filter Guaranteed isolation between primary and secondary: 3.5kV LHCb F. Murtas Servizio elettronica G. Corradi D.Tagnani P.Ciambrone Engineering example Power supply for: •Sensor •CPU •HV_GEM LHCb F. Murtas Servizio elettronica G. Corradi D.Tagnani P.Ciambrone LHCb M1 HV Proposal • 24 HV GEM : PS for LHCb M1R1 • 24 HV Output multiple connectors (or 12) • 24 current monitor channels for G3down 24 HVGEMs modules nano I meter • CAN-BUS communication • Setting Voltage 24 x 7 = 168 channels • Current limit set by trimmer (10-200 mA) • Total dimension : standard crate 3U standard crate 3 U LHCb F. Murtas Servizio elettronica G. Corradi D.Tagnani P.Ciambrone Conclusions • it has the same cost respect to “CAEN + passive divider” solution; • with the HVGEM system we are able to monitor all the 7 floating voltages applied to each detector; with the passive divider only 3 of them can be monitored; • with the new system we are able to change/adjust the voltage distribution among the three GEM foils of the detector (Vg1, Vg2,Vg3); with the passive divider they are fixed once for ever; • the new system with 24 chs nano-ammeter can be exploited to monitor the discharge of the detectors; • the system allows to limit the currents drawn by each single GEM foil; with the passivie divider this is not possible. • the transfer fields (the fields applied on the GEM gaps, between GEM foils) produced inside the detectors by the HVGEM can be kept constant also when gain is changed by increasing the voltage applied to GEM foils. This feature is of course not present in the HV divider solution; LHCb F. Murtas Servizio elettronica G. Corradi D.Tagnani P.Ciambrone