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Micromegas drift chambers
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Slow control for Compass Saclay chambers

• Françoise Gougnaud, Richard Azoulay, Pascale
  Deck, Yannick Queinec ( CEA Saclay DAPNIA )
  
• Hao Ren ( IHEP
  Beijing )
• 2002 12 MICROMEGAS (MICRO MEsh GASeous) chambers
  and 2 drift chambers
• High voltages
• 32 channels for the chambers
• 8 channels for PM

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• Thresholds for Micromegas chambers
• chip SFE16 a Front End BiCMOS ASIC
  dedicated
• to the Read-out Micromegas
• 24 busses x 36 SFE16 x 4 registers
• Thresholds for drift chambers
• 16 channels
• Low voltages
• 48 channels
• Gas system

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Hardware

• VME
• CPU PPC MVME 2431
• ADAS ICV196 binary input output
• VME interface board
• CAEN V288
• CAEN SY127
• A634 2KV 40µA
• A333 4KV 2mA

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Software

• Solaris 8
• EPICS R3.13.4
• medm, stripTool
• SNL
• Channel Archiver, xarr
• JAVA graphical interface for thresholds
• JAVA graphical interface for on-line errors

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Software for High Voltages

• EPICS software for CAEN SY127
• first developed by Dave Barker from CEBAF in 1994
• extension to negative polarity
• some problems with the response time
• some problems with the firmware CAEN

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Software for Thresholds of Micromegas
interrupt every 14 sec.
...
ASCII file of configuration for 24 busses of 36
SFE16 chips of 4 registers of 12 bit
24 bit pattern
24 busses x 36 SFE16
JAVA graphical interface
specific board
SNL prog.
ADAS ICV 196

archives
...
VME
configuration files
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THRESHOLDS FOR DRIFT CHAMBERS
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POWER SUPPLIES FOR LOW VOLTAGES
INTERFACE WITH THE GAS SYSTEM ?
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back
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