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NEC’2003 , September 0 3 , VARNA

CMS HCAL High Voltage Power Supply System. Dimitrov L.(*), Kunov B.(*), Sergeev S.(**), Vankov I.(*) (*) INRNE, BAS, Sofia, (**) FNAL,USA/JINR,Dubna. NEC’2003 , September 0 3 , VARNA. Compact Muon Solenoid (CMS) - detector of The Large Hadron Collider (LHC) in CERN

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NEC’2003 , September 0 3 , VARNA

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  1. CMS HCAL High Voltage Power Supply System Dimitrov L.(*), Kunov B.(*), Sergeev S.(**), Vankov I.(*) (*) INRNE, BAS, Sofia, (**) FNAL,USA/JINR,Dubna NEC’2003, September 03, VARNA

  2. Compact Muon Solenoid (CMS) - detector of The Large Hadron Collider (LHC) in CERN CMS Hadron Calorimeter (HCAL) consists of 50 mm brass plates with thin plastic scintillators between them Light collection is provided by wave length shifting fibers

  3. HCAL Photodetectors - Proximity Focused Hybrid Photo Diodes (HPDs) Photocathode p-i-n diode UHV ~ 10 kV UBIAS ~ 100 V 19 pixels Operate in high magnetic field – to 3 Tesla In all HCAL about 500 HPDs

  4. BV1 MODULE 1 (4-CHANNEL HV AND BIAS VOLTAGE POWER SUPPLY) CRATE POWER SUPPLY HV1 220 V BV2 HV2 UBLIM CRA T E L O K AL B U S BV6 HV6 HOST PC CRATE CONTROLLER HBV1 MODULE 2 (4-CHANNEL HV AND BIAS VOLTAGE POWER SUPPLY) HV1 (RS485) BV2 HV2 BV6 STATUS DISPLAY AND LIMITS PRESETTING HV6 BV1 MODULE 6 (4-CHANNEL HV AND BIAS VOLTAGE POWER SUPPLY) HV1 BV2 HV2 BV6 HV6 Fig. 1. The HV system Crate block diagram. 500-channel PS system • 6U Eurocrates • 125 HV Modules HV Module– 4 HV and 4 BV channels SDLP unit– 5 LEDs and 4 trims – UHLIM, IHLIM, UBLIM, IBLIM Crate Power Supply: 48 V, UBLIM+10 V, 5 V +8 V, -8 V

  5. Crate Controller: • information exchange between the hostcomputer and the crate via RS485 interface; • controls the Power Supply modules using custom backplane interface; • high and bias voltages setting – from the host computer; • polling of all voltage and current output values as well as the voltage and current limit values; • controls all crate supply voltages and gives alarm.

  6. HV1 DAC HV CHANNEL 1 CMP M U L T I P L E X E R HV4 DAC HV CHANNEL 4 CMP C R A T E L O K A L B U S ADC BV1 DAC BV CHANNEL 1 CMP BV4 DAC BV CHANNEL 4 CMP INTL LED LOCAL MODULE CONTROL INTERLOCK Fig. 2. Power Supply module block diagram HV CHANNEL- DC-DC converter – 0 - 14 kV BV CHANNEL– Linear stabilizer 0 - 200 V CMP– overvoltage and overcurrent control DAC– voltage setting MPX+ADC– voltage and current measurement INTERLOCK– HV line integrity control

  7. CONTROL LOGIC CPU A[13..15] A[8..12] D[0..7] RxDTxD A[13..15] A[0..7] D[0..7] CNTRL[0..3] KILL ST MD[0..3] CLK D-WR D-RD RES KILL STATUS DISPLAY AND LIMITS PRESETTING INTERFACE RS485 OUT TxD RxD S[0] MD[0..3] ON UTRIP ITRIP CPS TEMP RS485 IN CLK D-WR MEMORY D-RD RES A[0..12] UHLIM D[0..7] IHLIM UBLIM CNTR[0..3] IBLIM I Fig. 3. Crate Controller and Status display and Limits Presetting block diagram CPU- Intel singlechip microcomputer (I 8031) RS 485Interface with host computer CONTROL LOGIC – data exchange with modules MEMORY– stores all data – for Host KILL– high priority external command

  8. Status Display LEDs ·       ON (green) – when it is dark all channels in the crate are off; when it is lightthe output voltage of all set channels are established; ·    UTRIP (red)– at least overvoltage in one channel is registered; ·     ITRIP (red)– at least overcurrent in one channel is registered; ·    CPS(red)–atleast one of the crate power supply voltage values is out of range. ·   TEMP (red)– the inside temperature of the crate is above 50 0C.

  9. Status parameters displayed by the Host For each channel:on/off, ready, up/down, voltage fault, overvoltage, overcurrent For each module: on/off, overvoltage in any channel, over- curent in any channel, in any channel, activated interlock For each module:on/off, overvoltage, overcurrent, voltage fault, activated interlock in any module and others

  10. PROGRAM PACKAGE: Client/Server architecture INTERFACE - Distributed Information Manager (DIM) PACKAGE PROGRAMS: Server programs Client programs Fig. 4. The Power Supply System control program package. Debugging tools

  11. SERVER– up to 8 RS485 interfaces SERVER PROGRAMS: • Tools to set/retrieve the Power Supply system hardware configuration. • Tools to set and check serial ports. • Facilities to set DIM items names and alias names for a higher level monitoring system. • Publishing of the control information via DIM protocol. • Viewing of the published information for the debugging purposes.

  12. CLIENT PROGRAMS: Control and monitor the Power Supply System (see fig. 5). Data recording tool – data archiving. Alarming program – acoustic signals ARCHIVE BROWSER DEBUGGING TOOLS: Hardware emulator – for checking RS485. DIM information browser.

  13. The server works under any Windows OS of Windows NT clone Clients works at different computers with Linux or Windows OS HCAL HV power supply system will be integrated in the HCAL Detector Control System (DCS) based on the PVSS II Supervisory Con-trol And Data Acquisition Systemtoolkit. Fig. 5. The main window of the Power Supply System monitoring tool.

  14. Parameter High voltage Bias voltage Max operating voltage, V 12000 200 Max test voltage, V 14000 200 Voltage resolution step, V 4 0,05 Voltage ripple, mV p-p 100 1 Ramp rate, V/s 0 – 1000 0 - 100 Long term stability, % 0,1 0,1 Voltage monitoring accuracy, % 1 1 Max output current, uA 40 10 Current monitoring accuracy, % 1 1 Special Floating output

  15. THANK YOU FOR THE ATTENTION

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