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The SPS Beam-Loss System

The SPS Beam-Loss System. Hardware: Gianfranco Ferioli Software: Lars K. Jensen CERN SL/BI SL/OP Linkman: Antoine Ferrari. What is it used for ??. Machine protection Ring, Injection/Extraction, Transfer lines Diagnostics Identify hot-spots etc Loss Survey

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The SPS Beam-Loss System

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  1. The SPS Beam-Loss System Hardware: Gianfranco Ferioli Software: Lars K. Jensen CERN SL/BI SL/OP Linkman: Antoine Ferrari SPS Beam Loss System

  2. What is it used for ?? • Machine protection • Ring, Injection/Extraction, Transfer lines • Diagnostics • Identify hot-spots etc • Loss Survey • store integrated data for each monitor in SPS measurement/logging databases every hour SPS Beam Loss System

  3. C P U T G 8 A D C A D C A D C A D C A D C D M P System Description • Low-level system (VME crate): • ADC modules • Each module has 8 channels (multiplexed) • Total of 40 channels per crate (last 4 special) SPS Beam Loss System

  4. Installations and interlock #1 BA2 TT20 Beam Dump LSS2 BA1 LSS1 BA3 TT60 (LSS4) BA4 LSS6 BA6 (TT40) BA5 SPS Beam Loss System

  5. Installations and interlock #2 • SPS Ring (one interlock cable for 6 crates) • Ionization chambers are placed next to each main quadrupole • The beam-loss interlock is handled in software (latency = 20msec): • 1) If( monitor(n) (n = 1;36) is enabled) and if(Loss(n) > threshold(n)) => Count += 1 2) If(Count > N (user settable) ) => request dump • BLD System (3 individual cables) • Injection (LSS1), Extraction (LSS2, LSS6, (LSS4)) • Max. 16 channels • Interlock handled in hardware (latency ~1 usec) (DACs + comparators) SPS Beam Loss System

  6. Emergency beam dump • Presently the emergency beam dump channel for BLRING is shared with Beam Current Interlock -> problem as we are unable to disable only one • We will need one more channel for LSS4 for CNGS and LHC extraction SPS Beam Loss System

  7. Active Cycles • Presently a maximum of 10 possible elementary cycles can be handled in the low-level system (3 are presently used: P1 (FT), P2 (MD), ambient radiation) • We have our own events for each elementary cycle: • 0x2156+CT+CN: warning (T0 - 150 msec) • 0x2157+CT+CN: start (T0 - 10 msec) (acquisition of offsets) • 0x2158+CT+CN: stop (T0 + ???) (max acq = 2000) • We calculate an integer index to settings and acquisitions from: CT+CN • The number of acquisitions follows automatically the beam-in time (stop - start) • Improvement: CT+CN follows beam-type (FT, ions ..) SPS Beam Loss System

  8. Alarm/injection inhibit handling • An alarm survey is done on P1 (FT) and P2 (MD) cycles -> alarm screen in PCR • The acquisition of alarm states is synchronised using an SSM beam-out event: (0x2189+T+N) • The alarm surveillance process will inhibit injection of beam into the SPS, if a beam dump was requested for 3 consecutive cycles - else automatic reset by emergency system SPS Beam Loss System

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