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Requirements of the ESS BLM

Requirements of the ESS BLM. by Lali Tchelidze CERN, Geneva, 18 Oct. 2011. The ESS . ESS: Ion source Linac Target Neutron instruments 5 MW average power 2.5 GeV protons 2.86 ms pulse 50 mA pulse current 14 Hz repetition rate - similar to SNS, but higher power and long pulse.

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Requirements of the ESS BLM

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  1. Requirements of the ESS BLM byLaliTchelidze CERN, Geneva, 18 Oct. 2011

  2. The ESS ESS: Ion source Linac Target Neutron instruments 5 MW average power 2.5 GeV protons 2.86 ms pulse 50 mA pulse current 14 Hz repetition rate - similar to SNS, but higher power and long pulse. Max-IV ESS

  3. The ESS

  4. BLM requirements • BLM should produce a beam abort signal in less than 2 μs. • Faster than SNS detector is needed (?); • We’ve redesigned the current SNS ionization chamber (shorter gap in between the electrodes) to achieve faster ion collection time; • Prototype quoting/ordering under process; • Will test and compare the SNS, LHC and the prototype ionization chamber charge collection times as soon as we get all three;

  5. Dynamic range and Sensitivity • DR – large enough to detect slow signals, yet not saturate at high losses. • 1 W/m (at 1 foot) -> 100 mR/h beam-off dose rate -> 100 R/h beam-on dose rates! • 2 mR/pulse -> 0.69 R/sec during 2.86 msec pulse. • @ SNS they never use more than 1000. • Sensitivity - 70 nA/R/s (or even less) is probably enough.

  6. Cryogenic requirements • A hybrid design of a cryostat is foreseen for ESS. • an operating loss detector might be needed at 70 K / 2 K! • Physical size of the detector should not be very small – to cover a “large” part of the loss area.

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