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Problems with QPS DAQ Systems During LHC Operation, 1 st Results from 2010 CNRAD Tests

Problems with QPS DAQ Systems During LHC Operation, 1 st Results from 2010 CNRAD Tests. R. Denz TE-MPE-CP. Problems with stalled DAQ systems of QPS protection crates type DQLPU during LHC operation.

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Problems with QPS DAQ Systems During LHC Operation, 1 st Results from 2010 CNRAD Tests

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  1. Problems with QPS DAQ Systems During LHC Operation, 1st Results from 2010 CNRAD Tests R. Denz TE-MPE-CP

  2. Problems with stalled DAQ systems of QPS protection crates type DQLPU during LHC operation • The QPS DAQ systems use hardwired triggers for signaling a trigger of a quench detection system etc. • The hardwired trigger link permits the time-stamping of the event with a precision of 1 ms as required for post mortem analysis • During 2010 LHC operation several DAQ systems supervising protection units type DQLPU (main magnet protection) got stalled after a spurious trigger not linked to a real trigger of a detection system • Recovery only after a power cycle requiring access to LHC machine • Similar events observed already during electrical tests • Electrical breakdowns during isolation tests of the LHC main superconducting circuits • Events are normally non destructive

  3. Problems with stalled DAQ systems of QPS protection crates type DQLPU during LHC operation • Observed events • Aa • Apart from the incident during the technical stop all other events correlated to beam losses • The problem concerns only the DAQ system not the detection electronics • The field-bus coupler has not been affected

  4. Problems with stalled DAQ systems of QPS protection crates type DQLPU during LHC operation • Analysis: • The DAQ system gets stalled by a permanent logic low state on the trigger input • The problem can be partially cured by a firmware upgrade of the DAQ system, which will indicate the fault but allow to continue LHC operation • Access still required but can be organized at a more suitable time, e.g. within a normal accelerator stop • Analysis of the hardware layer points to a specific problem with a digital isolator of the ISO150AU type • Device successfully tested in TCC2 by QPS, failures reported recently (CNRAD 2009) by CRYO • Recoverable EMC vulnerability reported by manufacturer

  5. Problems with stalled DAQ systems of QPS protection crates type DQLPU during LHC operation • Analysis continued: • Problem seems to be related the operational mode: • Device errors can be cured by changing input signal of the digital coupler  normal operational mode for QPS and used during TCC2 tests  no problem observed (isolation of SPI bus signals) • The trigger channel operates with input signal only changing during real triggers or power cycles (to my understanding CRYO uses a similar operational mode) • Possible solution: • Limited amount of potentially affected devices (so far only DS areas  72 units) • Firmware upgrade will reduce impact on accelerator operation significantly • Could be deployed within one technical stop • Hardware upgrade would require production and installation of 160 new circuits boards

  6. 1st results from QPS CNRAD 2010 tests • Objectives 2010 • Identify possible problems for QPS electronics installed in RR13, RR17, RR53, RR57, RR73, RR77, UJ14, UJ16 and UJ56 during the current LHC run especially in 2011 • Continue radiation test evaluation of latest uFIP version (manufacturer B) • Test periods (position TSG46-4) • Period 6: crate to be moved to test with higher dose rate

  7. 1st results from QPS CNRAD 2010 tests • Devices under test 2010

  8. 1st results from QPS CNRAD 2010 tests • 1st results 2010 • Radiation load (22.09.2010): • D = 11.8 Gy (~0.01 Gy/h), n = 1.4 x 1011 cm-2, p = 9.6 x 1010 cm-2

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