UGcrate status

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UG-crate status

• AMS TIM - CERN - 15/4/2008
• A.Bartoloni, B.Borgia, F.R.Spada
• INFN Roma

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UG-electronics in the TRD Gas System
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UG electronics design history
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QM to QM2 modifications

• Replace the TPSxxxx regulators with SEL free
  LP2989 (UGBS, UGBC, UGFV)
• Put limiting resistor on Kulites and GP50 power
  supply lines (UGBS, UGBC)
• Separate 12V power supply for UGPS and flipper
  valve (UGFV)
• Introduce LP2953 regulator to generate 24V for
  pumps high speed (UGBP)
• Introduce LP2953 regulator to generate 21V for
  analog mux (UGBP)
• Eliminate 3.3V DC-DC converter ? generate
  3.3V from 5V on backplane
• Introduce Solid State Fuses (SSF) for short
  circuit protection on 5V, on each module
• Introduce pull-down resistors on Mosfet gates
• Introduce differential amplifier on Kulite inputs
• Eliminate UHVG ? redesign of backplane
• Eliminate 2 UGFV and reduce 8 multiple channels
  to 4 ? redesign of pcb

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UG electronics test history

• (1) since then, QM1-UG widely used for the TRD
  gas functional tests
• (2) SlowControl software used on QM1-UG and for
  QM2-UG functional tests
• (3) found a few problems in the FM gas circuit
  cabling (pumps and spirometer)
• (4) found some anomalous behaviour in interaction
  with UGPD - solved

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QM2 UG-electronics qualification test set-up
TV / EMC CHAMBER
UG CRATE
GAS SYSTEM SIMULATOR
SLOW CONTROL
TEST STATION
29V 12V 5V
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List of operations for qualification tests
Time needed to perform all commands 15 minutes
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UG crate in the termal chamber
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UG crate on the vibration plate
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Termal test profile
Before vibration
After vibration
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UG crate being prepared for TV test
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TVT temperature and pressure profiles
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EMC test setup
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EMC test setup
UG crate
UGPD
5.6V, 12V, 29V from UGPD
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EMC test setup
UG crate
UGPD
Marotta, pumps flipper simulator
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EMC test setup
28V power supply for UGPD
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Problems encountered during EMC test

• CE03 at 15kHz exceeded limit by 3db
• Inserted a 500 µF capacitor on 29V line to the
  backplane
• Solved
• RS03 at 60V/m, 240MHZ lost LeCroy communication
  between UGSCM and UGPD (with UGSCM ? UG crate ok)
• Elimination of one ground loop on LeCroy bus at
  UGPD
• Shielded 12V and 29V power cables (originally,
  twisted)
• Solved

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Conducted emission around 15 KHz with capacitor
on 29V
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Summary

• QM2 was qualified at SERMS, Terni
• Both the ESS and the TVT showed full
  functionality of the electronics, with stability
  of sensor readings within 0.3-0.4 in all
  temperature ranges
• Full reports are under preparation by the test
  laboratories
• Only two modifications will be implemented to the
  FM electronics
• one 470 µF capacitor on the backplane connected
  to the 29V A and 1 on the 29V B to comply with
  the EMC test
• 3K O pulldown resistors on RX0A and on RX0B on
  the backplane to avoid feeding static 5V from
  UGSCM to RS232 components in the UGBC
• The required ECO's will be issued
• No modifications required by the ESS or by the
  TVT test
• No modifications required by the functionality
  test performed on the actual gas circuit
• The spirometer was correctly read, and the pumps
  were correctly operated when correctly connected
• We require that
• on the UGPD FM controller S9011A, the grounding 0
  ohm resistor for the return line of the 3.3V be
  removed
• on the UGSCM FM  the pull-up resistors on RX
  lines be removed

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UG-electronics schedule
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BACKUP SLIDES
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Radiated immunity loss of UGSCM UGPD communication
60 V/m
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Conducted emissions
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EM to QM modifications

• Change power supply 24V ? 30V
• supply for Kulite, Marotta valves, pumps, heaters
• Pumps power supply
• 12V directly from DC-DC converter
• 24V with step-down circuit 30V ? 24V
• Heaters on CO2, Xe vessels
• on/off switches identical to Marotta valves
• Kulite gauges
• Dallas T sensors replacing GP-50 T
• n. 2 dedicated links to USCM
• No basic circuit modified (ADC, switches, serial
  link, )